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Non-linear Relaxation Loss of Non-uniform Prestressing Steel Bundles Peng Kai , Yu Congcong 2014, 33(3): 1-5.  DOI: 10.3969/j.issn.1674-0696.2014.03.01 Abstract ( )   PDF (391KB) ( )   The field-tested non-unifonn distribution characteristics of initial anchoring stresses in prestressing steel bundles were simulated with the random number production method , and the relaxation losses of bundles were studied based on the existing relaxation rule of the single prestressing strand. The results show that , if the unevenness of initial anchoring stresses in a prestressing steel bundle is considered , the average relaxation loss of the bundle is a丘ected by the dispersion coefficient of the bundle' s initial stress distribution in a distinct non-linear way , which is well fitted with polynomials. The work provides reference for the evaluation of prestressing steel bundles' relaxation losses and criteria for quality control in pre-stressed engmeenng constructlOn. References | Related Articles | Metrics

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Limit Load of the Beam Fixed at Two Ends under Concentrated Load Considering SD Effect Li Bin , Wei Chenglong ,Li Chuanxi 2014, 33(3): 6-10.  DOI: 10.3969/j.issn.1674-0696.2014.03.02 Abstract ( )   PDF (305KB) ( )   The elastic-plastic loading and def1ection process of the hyper-static beam fixed at two ends under SD effect was analyzed by the use of symmetry. 1t derived the curvature equations of geometric mid-axis of a perfectly-elastic-plastic beam with different yield strength in tension and compression for different states. The inf1uence of SD effect on plastic limit moment and def1ection were investigated. The results show that the bearing capacity of beams is increased , which is in fact the latent power of materials been brought into full play when considering SD effect. References | Related Articles | Metrics

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Comparison of Concrete Cable-Pylon Anchorage Models of Long-Span Cable-Stayed Bridges Ye Huawen , Xu Xun , Li Cuijuan , QiangShizhong 2014, 33(3): 11-15.  DOI: 10.3969/j.issn.1674-0696.2014.03.03 Abstract ( )   PDF (373KB) ( )   Aiming at two typical categories of cable-pylon anchorage structure (hoop pre-stressing model and steel-concrete composite structure) , the transfer mechanism , stress distr由ution and horizontal cable-load distribution of three typical cable- pylon anchorages were contrasted in detail , with the consideration of relative full-scale model test. And each stress point and some measurements to improve the stress distribution were summarized. Load-carrying efficiency was presented as an estimation index. The results show that both hoops pre-stressing model and steel-concrete composite struclure can be applied lo long-span br:idges , and the hoop pre-stressing anchorage evidently performs better. References | Related Articles | Metrics

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Main Girder Deflection Change of Hu' men Bridge Using AR (P) Model Zeng Fanxiang ,XU Xi 2014, 33(3): 16-17.  DOI: 10.3969/j.issn.1674-0696.2014.03.04 Abstract ( )   PDF (214KB) ( )   In the engineering case of main girder construction of Hu ' men Bridge , the def1ection change of girder sections in basket cantilever should be controlled to prevent the f1exure development of bridge span from the required demand. Auto-regressive (P) [AR (P) J model was used to monitor the bridge girder , which could simulate the construction synchronized with measurement and prediction. And AR (P) model aimed to support timely adjustment of the corresponding construction plan , which could make the construction condition of cantilever close to its design condition. The analysis results show that the joining precision of main bridge girder satisfies the design criterion. And it is verified that the AR (P) model is of practicality and rigor in the monitoring of bridge construction. References | Related Articles | Metrics

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Calculation of Interface Slip Distribution for Beam with Corrugated Steel Webs Zhao Hanwei , Han Xi , Wang Ling 2014, 33(3): 18-21.  DOI: 10.3969/j.issn.1674-0696.2014.03.05 Abstract ( )   PDF (262KB) ( )   Theoretical analysis on interfacial slip of model beam with corrugated steel webs under various typical loads was conducted to know the anti-bending performance of the box girder with corrugated steel webs. Based on the assumption that the corrugated steel didn' t bear the longitudinal axis force and vertical bending moment , the cross-section of beam with corrugated steel webs were divided into four independently ideal elastomers , and the slip differential equations was established. By simulating the actual boundary conditions , the interface slip expression of composite beams model was deduced under the uniformly distributed load , inid-span concentrated load , and the two-point symmetrical load. The expression of additional curvature caused by slip distribution was also derived. The mathematical formula is used to express the interface slip of corrugated steel webs beam , which lays the foundation for the load studies of corrugated steel webs. References | Related Articles | Metrics

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Mechanical Influence of Bridge Pavement Construction Defects on Deck Pavement Luo Jun , Huang Xiaoliang , Pan Zhenghua , Zang Jicheng 2014, 33(3): 22-26.  DOI: 10.3969/j.issn.1674-0696.2014.03.06 Abstract ( )   PDF (398KB) ( )   In the analysis of local entity model of deck boards of continuous rigid frame bridge box girder , the construction defects caused by construction joints in deck pavement and the bond defects between the pavement layer and the bridge deck were analyzed by 3D fil1ite element method. The stress features of the bridge pavement and the influence of interface connection state on the interlayer shear stress and tel1sile stress distributiol1 were also al1alyzed. It is concluded that whel1 defects occur betweel1 the bridge deck pavemel1t al1d bridge deck , larger shear stress , larger longitudil1al al1d tral1sverse tensile stress will occur il1 pavemel1t ul1der the traffic loads , which causes the shear failure damage il1 the bridge deck pavemel1t structure and the crackil1g in concrete pavemel1t cushiol1 References | Related Articles | Metrics

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Deck Fatigue Crack Detection ?ased on Electrical Resistance Method YuanZhou Zhiyuan , Ji Bohai , Fu Zhongqiu , Liu Rong , Cheng Míao 2014, 33(3): 27-31.  DOI: 10.3969/j.issn.1674-0696.2014.03.07 Abstract ( )   PDF (350KB) ( )   Based on the resistance change before and after crack occunence on steel deck , the law of resistance variation near crack , the influences of deck width , the spacing of measuring points and the anangement of measuring points were analyzed. And the deck fatigue crack detection based on electrical resistance method was studied. It is shown that the smaller the spacing of electrode is , the higher accuracy of the detection is. Large electrode spacing is suitable for preliminary meas urement of the position of the crack occunence , and the small one is suitable for accurate location. The distribution of measuring points was designed , and three kinds of pragmatic resistance measurement methods were presented. Formulas of fracture damage rate and equivalent depth of crack were established. The results regarding the fatigue crack detection of U rib show that the deck fatigue crack detection based on electrical resistance method is feasible and highly precise References | Related Articles | Metrics

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Quantitative Assessment for Bridge Failure Costs Zeng Yong ,Yu Fu ,Zou Xiaoyong ,Tan Hongmei 2014, 33(3): 32-37.  DOI: 10.3969/j.issn.1674-0696.2014.03.08 Abstract ( )   PDF (552KB) ( )   The failure costs were used to assess the bridge failure effects , and a quantitative cost model of bridge failure was proposed. Failure costs of bridge , which indicated the consequence of bridge failure , were divided into the reconstruction cost , transportation cost , delay cost of road and traffic management cost , personal injury compensation cost , repair cost and other indirect cost. The characteristics and calculation methods of the above components were focused. The single cost indicator was proposed to consider the impact of the failure costs in different times , and the severity coefficient of the consequence were used to compare the severity of different degrees of the bridge failures. A case study was carried out. The results show that the proposed cost model is representative and can be used for the cost estimation of bridges failure and scientific management in decision-making. Taking social impacts into account , the failure costs are more complex , which needs to be further studied. References | Related Articles | Metrics

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Damping and Blasting Technology for 45m Deep Foundation Pit Wei Liangwen , Zhang Bin , Han Fenglei ,Zhang Xuefu 2014, 33(3): 38-40.  DOI: 10.3969/j.issn.1674-0696.2014.03.09 Abstract ( )   PDF (286KB) ( )   In order to optimize the damping and blasting excavation design of Jiangbei railway station in Chongqing， dynamic FEM research was carried out based on ANSYS/LS-DYNA, and the vibration velocities of retaining pile , air shaft, tunnel stmcture caused by blasting during the excavation process were analyzed and compared. According to the numerical simulation results , the reasonable damping strategy was proposed , and simulation data and monitoring data in field were compared and analyzed. 1t is indicated that simulation data and monitoring data have the same attenuation law; the blasting impact on 出e structure is effectively reduced by a reasonable damping design; and setting damping isolation belt is an effective method for damping. References | Related Articles | Metrics

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Blockade of Trunk Highway in Southwest Mountains Areas Tian Qiangchun , Zhu Hongzhou , Wang Qingzhen ,Gao Lingran 2014, 33(3): 41-44.  DOI: 10.3969/j.issn.1674-0696.2014.03.10 Abstract ( )   PDF (389KB) ( )   For geography , geology , climate , hydrology and hydrogeology characteristics of southwest mountainous areas , the main features , blocking reasons and distribution law of trunk highway in southwest mountainous areas were analyzed by using the statistics database of blockade of Chongqing trunk roads from 2007 to 2011. The results show that various causes , blocking with a high concentration , great block accumulative influence and strongly concentrated of blocking regions are the main features of the blockade of trunk highway in southwest mountainous areas. And sudden blocking is the main style; the incidence of unexpected block is 79. 8 %. The main causes of blocking are geological disasters and adverse weather conditions , accounting to 57% and 19% respectively of the total blockade numbers. The second main blocked cause of geological disasters blocking is landslides and mudslides , accounting to 33%and 32%of the total blockade numbers caused by various geological disasters. The second blocked cause of inclement weather is rainfall and the blocking event rate is up to 68%. And the peak of blocking occurs in winter and summer. Especially in January , June and July , the blocking occurs most frequently and the blocking effects are rather larger. The total blocking times in these three months are over 50% of the total times throughout the year. The blocking conditions of different state roads and provincial highways have great difference and the accumulative blockade numbers of route G319 is the most. References | Related Articles | Metrics

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Different Modes of Viscoplastic Deformation Behavior for Asphalt Mixtures Ye Yong , Chen Hongkai 2014, 33(3): 45-48.  DOI: 10.3969/j.issn.1674-0696.2014.03.11 Abstract ( )   PDF (300KB) ( )   Deformation compostions of asphalt mixture were analyzed and a visco-elastoplastic rheological model framework including elastoplastic ，viscoelastic and viscoplastic deformation characterization was presented. Three modes , mainly described viscoplastic deformation , were established under three different hypothesis: ( viscoplastic stress was in proportion to creep acceleration; ( viscoplastic strain was a function of loading time; ( viscoplastic strain followed a strain -ha地nmg law , and then viscoplastic behavior models were obtained. Uni-axial- compression creep tests were performed under different stress amplitudes (0. 10 , O. 15 , 0.20 , 0.25 and 0.30 MPa) , and the model parameters were obtained. The data of three proposed models were quantitatively compared with the experimental data. It is shown that the results of the three proposed models all have a good agreement with the experimental ones at the lower stress condition , but at the higher stress condition , model 2 is the best , model 1 comes second , and model 3 is poor to predict the initial creep. References | Related Articles | Metrics

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Influence of Mineral Fillers on Performance of Asphalt Rubber Mixtures Tang Naipeng , Huang Weidong , Zheng Mao 2014, 33(3): 49-52.  DOI: 10.3969/j.issn.1674-0696.2014.03.12 Abstract ( )   PDF (354KB) ( )   Based on the asphalt rubber mixtures , the asphalt fi1m thickness in 5. 0% , 6.0% and 6.5% asphalt content was obtained by calcu1ation. The impact of minera1 fillers on the performance of asphalt rubber mixtures was analyzed. Cantabro test , moisture damage resistance test and f1exura1 fatigue test at 4 points were carried out in 1aboratory to identify the performance differences between mixtures with and without minera1 fillers , including the bonding performance , water damage resistant performance and fatigue performance. The test results indicate that Cantabro 10ss of mixtures with mineral fillers is 1ess than that of mixtures without minera1 fillers. And when the asphalt content is 6% and 6.5% in aspha1t mixtures , tensile strength ratio (TSR) of mixtures with minera1 fillers is 10wer than the mixtures without mineral fillers. However , fatigue results show that the fatigue pelformance of mixtures without mineral fillers is obvious1y better than that of mixtures with minera1 fillers. It is concluded that the use of mineral fillers in aspha1t rubber mixtures decreases the fatigue resistance , but increases the bond performance and water damage resistance slightly. References | Related Articles | Metrics

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Compound Modification of Wax Warm Mix Agent and Rock Asphalt Song Qingqing , Yu Jiang , Feng Juan , Zhang Fan 2014, 33(3): 53-57.  DOI: 10.3969/j.issn.1674-0696.2014.03.13 Abstract ( )   PDF (347KB) ( )   When the rock asphalt improved the matrix asphalt' s high-temperature pertormance ， thermal susceptibility and the resistance to aging ， it also increased the mixture and compaction temperatures. However , warm mix agent could lower asphalt' s mixture and compaction temperatures. Based on this , KSHD typed warm mix agent and Xinjiang Urho rock asphalt were selected as modifiers to test their compound modified effect on the matrix asphalt. And the modification mechanism was analyzed through composition change. The result shows that the compound modification by warm mix agent not only retains the advantage of using rock asphalt as modifier but also lowers the asphalt' s mixture and compaction temperatures. In addition , the crack resistance of asphalt at lower temperature is also improved at certain degree. Moreover , it is found that the saturates and asphaltenes of sol-gel type asphalt increase after adding the wax warm mix agent , while the resins and asphaltenes of sol type asphalt increase References | Related Articles | Metrics

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Theory Analysis and Numerical Simulation of Pile-Net Composite Technology in Highway Subgrade Widening Xue Jianrong , Yang Chunjing 2014, 33(3): 58-62.  DOI: 10.3969/j.issn.1674-0696.2014.03.14 Abstract ( )   PDF (386KB) ( )   The pile-net composite foundation processing technology , that is horizontally reinforced and vertically strengthened , was used in highway widening project. And the technique was simulated by finite element method. The results indicate that the pile-net composite foundation treatment technology solves the problems of differential settlements caused by new and old roadbed and splicing quality of embankment. The vertical differential settlements caused by new and old roadbed and the horizontal displacement of new embankment are effectively controlled. Therefore , this technique can satisfy the requirements of highway expansion. References | Related Articles | Metrics

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FED Analysis on Large Deformation of Foundation Reinforced with Consolidation Teng Qianliang , Hu Runzhong , Li Xiang 2014, 33(3): 63-66.  DOI: 10.3969/j.issn.1674-0696.2014.03.15 Abstract ( )   PDF (332KB) ( )   2D simplified model was established to analyze the consolidation mechanism , displacement , strain and stress characteristics by dynamic finite element analysis. The optimal hammering numbers and effective reinforced area were studied by 10 times hammering and deformation control. It is indicated that optimal hammering number is 6. The effective rein forced areas are 2 times of the rammer diameter in width and 2.5 times in depth. References | Related Articles | Metrics

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Vertical Distribution of Flow Mixing Length ?ased on Fractal Theory Wu Lichun , Ni Zhihui 2014, 33(3): 67-71.  DOI: 10.3969/j.issn.1674-0696.2014.03.16 Abstract ( )   PDF (318KB) ( )   Current mixing length formulae are varied , and different forms of water flows need to select different empirical parameters. According to the fractal theory , combined with motion mechanism theory of mixing-length of sediment-laden f1ow , a modified formula of vertical distribution of mixing-length was deduced. And the size of the dimensions of mixing length in the modified formula was analyzed , and the relationship between sediment concentration and mixing length dimension was presented. The test results show that the modified formula has high accuracy , and is oRtimal compared with linear distribution and parabolic distribution modes. References | Related Articles | Metrics

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Berth-Crane Allocation Constrained by Parallel Operation Efficiency of Quay Cranes Gao Chaofeng , Hu Zhihua 2014, 33(3): 72-78.  DOI: 10.3969/j.issn.1674-0696.2014.03.17 Abstract ( )   PDF (509KB) ( )   Regarding the problem that the interferences among parallel operational cranes affect the efficiencies of cranes , the strategies for berth allocation and quay assignment were studied , considering the constraints of efficiency of parallel operational cranes. A mixed integer programming linear model was established to minimize the penalty costs when vessels stayed waiting for operations. Interfer ence factors in different operation environments and penalty coefficients off the optimal berthing position were introduced in the model to analyze the effects of varying the working hours of cranes and penalty costs. And the effects of the numbers of parallel operational cranes on the efficiency of these Cranes were further studied. The case studies show that more parallel operational Cranes can speed up the container handling tasks and reduce the penalty costs of vessels waiting for operations; however, it reduces the operation efficiencies of cranes , which increases the working hours of cranes and total operation costs of port. References | Related Articles | Metrics

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Groundwater Variation of Soil Banks in Fluctuation of Reservoir Water Level Xiang Jie , Tang Hongmei , Chen Xin , Liang Xuezhan , Zhao Xiantao 2014, 33(3): 79-85.  DOI: 10.3969/j.issn.1674-0696.2014.03.18 Abstract ( )   PDF (484KB) ( )   Taking bluestone landslide of Shennvxi River as a prototype , and taking Three Gorges reservoir water level variation as the condition , soil reservoir bank model was established by similarity theory. The soil physical parameters , the pore water pressure data and slope crack condition were obtained by the experiment. The groundwater seepage line position in model condition was calculated with the adoption of Boussinesq unsteady seepage differential equation. The research results show that in the rising stage of water level , the increasing of pore water pressure is the activator of slope cracking , by the pore water pressure curve with different elevation and the calculated slope seepage line. In the drawdown stage of water level , mobilized water pressure is the key factor to affect the bank stability by the analysis on the pore water pressure curve with different elevation and the calculated slope seepage line References | Related Articles | Metrics

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Dynamic Stability of High Rock Slope Located at Intake of Jinfoshan Reservoir WangJunjie ， Wu Yang , Liu Liangjun 2014, 33(3): 86-91.  DOI: 10.3969/j.issn.1674-0696.2014.03.19 Abstract ( )   PDF (449KB) ( )   Focusing on the high rocky slope located at intake of Chongqing Jinfoshan reservoir , the dynamic response law and failure mechanism of slope rock mass were analyzed by the dynamic fin ?te element method , adopting the artificially modified acceleration curve as the input condition of earthquake. The results show that the anti-seismic effect of bolt-spray supporting is significant , which effectively constrains the deformation of the slope in earthquake. The movement direction of the rock in earthquake is horizontal , the stress is mainly compressive stress , and there is no obvious tensile stress area. In the whole range , the distribution of acceleration magnification coefficients of earthquake is irregular; the response speed of rock mass lags behind Pope change of earthquake wave , which is affected by the cumulative effect of earthquake. The slope is safe under the design of anti-seismic engineering according to seismic intensity VII. Although it may occur top-down pressure- induced crack damage under earthquake , the slope is unlikely to be large-scale inertial instability. References | Related Articles | Metrics

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Stability Evaluation and Control Strategy for Daoziyan Unstable Rock in Wansheng District of Chongqing Liao Yunping , Wang Xiaowei 2014, 33(3): 92-97.  DOI: 10.3969/j.issn.1674-0696.2014.03.20 Abstract ( )   PDF (428KB) ( )   Due to the cutting by joints and dissolution , part of the Daoziyan cliff in Wansheng district was evolved into unsta ble rock blocks , and the failure modes could be divided into three types: sliding , toppling and falling. The qualitative and quantitative analysis on the stabilities of the above 3 types of unstable rock was calTied out. The results indicate that: in natural conditions , most of the unstable rock blocks are in basically stable-steady state; in rainstorm conditions , 38% of the unstable rock blocks are in basically stable-steady state , and 62% are understable-unstable , which have great potential danger. The control stratgies for unstable rock blocks were proposed , combing with active and passive control stratgies. And for the specific rock , the treatments including lining , closing , anchorage , clearing , surface drainage and blocking stone were selected. References | Related Articles | Metrics

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An Improved Calculation Mothod for Soil Plug Effect Cui Jianghao 2014, 33(3): 98-101.  DOI: 10.3969/j.issn.1674-0696.2014.03.21 Abstract ( )   PDF (274KB) ( )   According to the theory' of soil arching effect , a new method of calculating the effect of soil plug was proposed by the analysis of the pipe pile arching effect mechanism of soil plug in pile driving. The occlusion degree of soil plug of pipe piles driving in any depth was judged. Soil arching effect was analyzed by numerical simulation , and the relationships between the soil plug effect , pipe pile diameter and soil plug height were obtained. Practical engineering analysis results show that the proposed method is good for the judgment of soil plug effect and the prediction of pipe pile driving difficulty. The data got by the proposed method are in good agreement with actual data References | Related Articles | Metrics

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Evaluation of Low Carbon Transportation Development Based on PSR Model Wang Jianwei , Zhang Xiaoming , Song Qingliang , Gao Jie 2014, 33(3): 102-107.  DOI: 10.3969/j.issn.1674-0696.2014.03.22 Abstract ( )   PDF (503KB) ( )   Based on the sustainable development theory and pressure-state-response (PSR) model , low carbon transportation development index was presented with its connotation. A case study relating the low carbon transportation development evaluation of Hebei province was conducted by entropy method and comprehensive evaluation method. The results show that the pressure index of low carbon transportiation development in Hebei province increases year by year. State index sharply declines in the "10th five-year plan" period , and remains stability in the "11 st five-year plan" period , although at a rather low level. Response index also increases year by year. Comprehensive development index has significant stage characteristics: the first stage (2001-2005) is from high to Iow in a whole , the minimum value appears in 2005 , and the index value is 0.387; the second stage (2006-2010) rises slowly with a smalI-scope fluctuation generally. References | Related Articles | Metrics

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Conflict Delay Model for Left Turning Car in the Case of Straight Priority Zheng Changjiang,Xu Han,Chen Tianxing 2014, 33(3): 108-110.  DOI: 10.3969/j.issn.1674-0696.2014.03.23 Abstract ( )   PDF (204KB) ( )   Based on the assumption that the vehicle headway followed M3 distribution , the left-turn cars' delay model at two phase intersection in the case of straight priority was deduced , by probability theory and queuing theory. And then the model was validated by actual survey data. The results show that the model has high accuracy and good practicability References | Related Articles | Metrics

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Construction of City Trestle Space with Harmonious Settlement Environment Yang Zhong , Yang Ye ,Hou Yi , Liu Aiqun 2014, 33(3): 111-114.  DOI: 10.3969/j.issn.1674-0696.2014.03.24 Abstract ( )   PDF (339KB) ( )   Elevated road can release the traffic pressure efficiently and it is an important function part of the modernized city. 1n order to develop the sustainable city construction and build a harmonious living environment , the key issues were discussed , including respecting the settlement status , building comfortable driving environment and maintaining the quality of the residents' living space. It was presented that bridge designers need to improve the architecture cultivation to avoid the conflict with the environment caused by excessive emphasis on the function. References | Related Articles | Metrics

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Evaluation of Pedestrian Service Level for Sidewalks Based on BP-PLS Model Li Jia , Deng Min 2014, 33(3): 115-118.  DOI: 10.3969/j.issn.1674-0696.2014.03.25 Abstract ( )   PDF (349KB) ( )   BP-PLS model was used to evaluate the pedestrian service level for sidewalks. The method was used with the advantage that the neural networks could correctly characterize the non-linear relationship between the evaluation results and evaluation indicators. The PLS was used to make up the defects of BP model relating the determination of node numbers for hidden layers and the weights initialization method. The case study shows that the BP-PLS model has a good capability for fitting and forecasting , which can be used to evaluate the pedestrian service level for sidewalks References | Related Articles | Metrics

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Passengers Off-Site Choices of Transportation when Railway Is Arriving Yun Liang, Jiang Yangsheng , Xie Han 2014, 33(3): 119-123.  DOI: 10.3969/j.issn.1674-0696.2014.03.26 Abstract ( )   PDF (453KB) ( )   Current traffic choice models lack the consideration of the arriving passengers' requirements of service levels when the railway is arriving at the station. In order to solve this problem , the alTiving passengers' off-site modes choosing mechanism was analyzed; the expectations of service level were defined as factor variables; and the arrlvmg passengers' off-site modes as well as the utility function were improved. Finally , the model was validated with the survey data obtained by Chengdu East Railway Station. The results show that , when the value of service level indicator parametery is low , those passengers with higher service level requirements will shift from public transpOltation to private transportation; whenβIS high , passengers can' t make the most profitable decision because of traffic information asymmetry , which causes part of the public transportation resources do not work. References | Related Articles | Metrics

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Driver' s Operation Behavior during Eyes off Road Wang Chang , Guo Yingshi , Fu Rui , Yuan Wei , Song Dianming 2014, 33(3): 124-128.  DOI: 10.3969/j.issn.1674-0696.2014.03.27 Abstract ( )   PDF (418KB) ( )   Aiming at the driver' s operation behavior during eyes off road , non-contact eye movement tracker , lane mark detect system , CAN bus data capture device and other instruments were used to set up natural driving test vehicle. Driving behavior data and vehicle running data of some drivers in real road conditions were co!lected by using this test vehicle. Data analysis results shows that during driver' s eye off road , the average of steering angular velocity is O. 325 ( 0) / s , and it has significant difference of the normal steering angular velocity , which is O. 853 ( 0) / s. With the increasing time of eye off road , the trend of vehicle running away the center line of lane becomes evidently. And drivers wi!l release the accelerate pedal with the increasing time of eye off road in order to improve the control degree of the vehicle. References | Related Articles | Metrics

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Key Techniques of Intelligent Data Processing and Application of MITS Li Zheng , Lu Baichuan , Zhi Pengfei , Zhang Xinyu 2014, 33(3): 129-132.  DOI: 10.3969/j.issn.1674-0696.2014.03.28 Abstract ( )   PDF (313KB) ( )   Focusing on the characteristics of Marine Intelligent Transport Systems (MITS) and combing with the success cases of land ITS applications , the basic structure of Marine Intelligent Transport Simulation Systems (MITSS) was designed. The methods including data mining , wavelet multi -scale decomposition and reconstruction , neural networks , Kalman filtering , as well as genetic algorithms were used to study the data preprocessing , data fusion and prediction in MITS. It is indicated that the proposed technique is good for the management and security of the shipping , which can also reduce congestion , increase traffic mobility , reduce the shipping impact on environment , and improve waterway capacity and traffic efficiency. The technique provides technical support for further development of the system References | Related Articles | Metrics

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Multi-level Adjustment Strategy for Disruption Management of Berth-Crane Allocation Problem at Container Terminals Lin Qingfu , Hu Zhihua, Tao Sha 2014, 33(3): 133-139.  DOI: 10.3969/j.issn.1674-0696.2014.03.29 Abstract ( )   PDF (615KB) ( )   Aiming at the problem how to minimize the interterence impacts of wharts , a mixed integer linear planning model of continuous berth allocation problem with quay crane assignment was established to obtain the original scheduling and assignment plan. Based on the different delay degrees of vessels , a multi-level adjustment model was established to cope with the delays by adjusting the berths and quay cranes. By simulation and case studies , the optimal adjustment schedules under different delay degrees were obtained to minimize the interterence impacts on the terminal operation system, meanwhile , the smooth implementation of terminal operation was ensured. The case study results indicate that comparing with the strategies including local adjustment and rescheduling , the multi-level adjustment strategy can be used to balance the shareholder' s benefits including terminal operators and ship owners , and the more reasonable interterence countermeasures will be obtained. References | Related Articles | Metrics

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Power Distribution Strategy of Extend Range Electric Vehicle Based on Fuzzy Control Pan Chaofeng ,Han Fuqiang , Chen Liao ,Xu Xing , Chen Long 2014, 33(3): 140-144.  DOI: 10.3969/j.issn.1674-0696.2014.03.30 Abstract ( )   PDF (320KB) ( )   Extended range electric vehicle can effectively solve the problem that the driving mileage of pure electric vehicle is not sufficient. Taking the extended range electric vehicle as a research subject , a kind of energy distribution strategy was designed based on the fuzzy control theory. The strategy was simulated by Cruise and MATLAB/Simulink and its effectiv巳ness was validated by the NEDC condition test. The resuIts show that the strategy based on fuzzy control theory has strong robustness and is weII controIIed; meanwhile , it can also reduce emissions effectively and keep battery SOC in an ideal range , which avoids overshoot or over-discharge. References | Related Articles | Metrics

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Control Method for Electric Power Steering System Based on Dead-Zone Inverse Transforming Compensation Liang Songfeng ,Dong Zhurong , Qiu Hao 2014, 33(3): 145-148.  DOI: 10.3969/j.issn.1674-0696.2014.03.31 Abstract ( )   PDF (273KB) ( )   Through the ana!ysis of experimenta! data , the actuator mathematical model was deduced. According to the characteristics that the actuator had the dead-zone , the control algorithm regarding the dead-zone inverse transforming compensation was designed to eliminate the adverse impact of dead-zone for control system. The effectiveness of improved algorithm was validated theoretically by MATLAB , and the corresponding control parameters were obtained. Real vehicle experiment results show that the proposed method can effective!y eliminate the control deviations caused by dead-zone. References | Related Articles | Metrics

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Thermal-Mechanical Coupling of Clutch Pressure Plate in Start Condition Gao Xiang , Xu Yang , Liang Baoqian , Pan Daoyuan 2014, 33(3): 149-154.  DOI: 10.3969/j.issn.1674-0696.2014.03.32 Abstract ( )   PDF (396KB) ( )   The failure of pressure plate happens frequently in the multi-stress circumstances. The coupling thermal mechanical analysis on the car clutch pressure plate in the standard start condition was carried out , by using Pro/E , Hypermesh and MSC. Marc. The variation trend and law of the temperature and stress field changing with radius and time in start condition were obtained. It is concluded that there are some distribution similarities between temperature and stress fields in different conditions , but compared with the temperature field , the stress field lags. References | Related Articles | Metrics

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Incidence of Failure Factors for Gasoline Direct Injection System Liu Chiwei ,Jing Yujun 2014, 33(3): 155-160.  DOI: 10.3969/j.issn.1674-0696.2014.03.33 Abstract ( )   PDF (425KB) ( )   The gasoline direct injection system fault tree was estab!ished combining with the experience of automobile fault diagnosis expert. The minimal cut sets of 4 essential fault models were analyzed , and then a three-level structure model was established. The weight of each basic event OCCUlTence probability in the fault tree was obtained by analytic hierarchy process , and the weak link of the system reliability was found out by so此ing. The reliability of the high importance components including fuel pump , fuel injector, high pressure fuel pump , and fuel pump control unit were analyzed. Useful recommendations for system optimization and maintenance are proposed and the efficiency of fault diagnosis is improved. References | Related Articles | Metrics

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Dynamic Characteristics and Simulation of Luffing Mechanism of Aerial Work Platform Yang Gang , Luo Tianhong , Jia Yongqing 2014, 33(3): 161-165.  DOI: 10.3969/j.issn.1674-0696.2014.03.34 Abstract ( )   PDF (330KB) ( )   Taking the luffing mechanism of a certain aerial working platform as the research object , the simulation model was established by software AMESim , and the dynamic characteristics of hydraulic luffing mechanism were analyzed. The per formance of luffing mechanism was improved greatly by using bi-direction counterbalance valve. The results show that in the case of an extemal force disturbance , the spool can quickly reach the force balance and the inlet oil flow can remain constant by using bi-direction counterbalance valve. The opening pressure of counterbalance valve should maintain moderate and smaller valve opening pressure causes sensitivity of load variations , which causes jitter amplitude. References | Related Articles | Metrics

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Design and Implementation of Information Management System of Water Supply Pipeline Network ?ased on GIS Mu Fengyun , Wang Yunfei ,Luo Dan , Guan Dongjie 2014, 33(3): 166-170.  DOI: 10.3969/j.issn.1674-0696.2014.03.35 Abstract ( )   PDF (410KB) ( )   The research and development of the application system of urban water supply pipeline network management are the requirements of the development of modem city. According to the status quo , characteristics and requirements of urban water supply pipeline network , four sections including the data organization of system module , the module function of system , the interface of system module and the logic control of module were studied and designed in detail. The proposed information system provides decision basis for the efficient management of urban water supply agencies References | Related Articles | Metrics