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15 December 2004, Volume 23 Issue 6 Previous Issue    Next Issue

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Bridge carrying-capacity changing theory and the applicable techniques XIAO Sheng-xie, PENG Kai, MIAO Ji-lun,WANG Jia-lin 2004, 23(6): 1-3.  Abstract ( )   PDF (124KB) ( )   A new bridge carrying-capacity changing theory is proposed in the paper and then generalized as four changing phases: a dissipation phase, a deterioration phase, a destruction phase and a promotion phase. In turn, the scientific definitions, the features, the influential factors, the effect quantification and model systems corresponding to the different four phases are summarized to provide theoretical and applicable guide for the technical evaluation and rebuilding of aged bridges References | Related Articles | Metrics

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Application frame system of bridge carrying-capacity changing theory XIAO Sheng-xie, PENG Kai, ZHENG Xiao-gang, ZHU Zeng-hu 2004, 23(6): 5-6.  Abstract ( )   PDF (181KB) ( )   Corresponding to the bridge carrying-capacity changing theory, the application frame system is set up in the paper to provide the carrying capacity calculation and programming with guiding ways References | Related Articles | Metrics

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A new way of calculating the normal stresses on re-cracked cross sections of prestressed concrete beams ZHAO Jing-bo, PENG Kai, XIAO Sheng-xie, WANG Wei 2004, 23(6): 7-9.  Abstract ( )   PDF (190KB) ( )   Based on the empirical formulae calculating the tendon stresses on re-cracked cross sections of prestressed concrete beams, the positions of neutral axes and the normal stresses of compressive concrete edge fibers on re-cracked cross sections of prestressed concrete beams are determined in a new way, the amplifying effects of the first-time cracking and the cycling fatigue loads on the steel bar stresses and concrete stresses considered. A exemplificative prestressed concrete cross section is c... References | Related Articles | Metrics

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Coupled vibration analysis of rail-way simple-supported curved-girder bridges and vehicles with soil-structure interaction SHAN De-shan, LI Qiao 2004, 23(6): 10-14.  Abstract ( )   PDF (392KB) ( )   The coupled vibration analysis of rail-way simple-supported curved-girder bridges and vehicles was discussed in this paper. The dynamical equations of plane curved beam were deduced. According to features of coupled vibration between bridge and vehicle, a new numerical algorithm, which is based on the nonlinear excitation, was proposed. Above all, the algorithm can decrease the iterative time without losing precision. And the softwar VCBID was developed based on Windows 9X/2000/XP operation sy... References | Related Articles | Metrics

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Some matters of dynamic response based health monitoring for large bridges LU Ping ,, WU Hai-jun 2004, 23(6): 15-18.  Abstract ( )   PDF (132KB) ( )   The health monitoring system study for large bridges has become a popular item over the world recently, and dynamic response based health monitoring is the key and difficulty point in whole system. The basic contents and component parts of dynamic response based health monitoring are introduced in this article. Achievements that obtained in recent years is discussed, furthermore problems and difficulties existed in the study of dynamic response based health monitoring are analyzed. Development t... References | Related Articles | Metrics

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Typical damages and causes of bridges WU Hai-jun,，CHEN Ai-rong，LU Ping 2004, 23(6): 19-23.  Abstract ( )   PDF (144KB) ( )   Bridges are suffered from serious damage defects which are introduced for major bridge types in this article. Typical damage defects of bridge structure and the reasons are discussed, moreover, suggestions and approaches are proposed to solve the problems. At the end, advices for the study of bridge damages are presented References | Related Articles | Metrics

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Application of space integrated element method to assessing and reinforcing of old bridge JIN Xin-hua，ZHANG Peng-tao 2004, 23(6): 24-27.  Abstract ( )   PDF (666KB) ( )   Increasing with the service time of large numbers of bridge, assessing and reinforcing of bridge became increasingly to be important part of maintaining of old bridge. As a space analysis technics of bridge, it has predominant that application of space integrated element method to assessing and reinforcing of old bridge. As the examples, application of space integrated element method to several really engineering was introduced, thereby it provided technology reference for assessing and reinforc... References | Related Articles | Metrics

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Application of bonding steel plate in reinforcement of old stone arch bridge CUI Sheng-ai, ZHANG Guang-shan, MENG Yun 2004, 23(6): 28-31.  Abstract ( )   PDF (135KB) ( )   Taking Huangjiawan (Ri-yue) bridge along the line from Changshou county to Kai county as an example, this paper introduces calculation process and construction craft of the reinforcement of the old stone arch bridge with bonding steel plate, and indicates applicability and usefulness of bonding steel plate method in reinforcement References | Related Articles | Metrics

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Stress analysis of the concerning regions of the vertically tensioned prestressed concrete simple beam HU Xiao-lun, ZHOU Zhi-xiang 2004, 23(6): 32-36.  Abstract ( )   PDF (531KB) ( )   Proposed by prof.ZHOU Zhi-xiang in 1994, the vertically tensioned prestressed technology is different from the general post-tensioned technology in the construction details ,which affect directly its popularization.Using the ANSYSs submodeling technology, the authors discuss comparatively the bond length of prestressed tendons and the stress distributing of bond anchorage region and bolt fixation region References | Related Articles | Metrics

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Discussion on applying hydraulic components to arch bridge WANG Xiao-yi, HE Xue-feng 2004, 23(6): 37-39.  Abstract ( )   PDF (130KB) ( )   A type of active composite component composed of several hydraulic components is presented. The axial force, bending moment and shear force of this type of active composite component can be controlled. A controllable arch bridge is formed by substituting several segments of the arch ribs by active composite components. The mechanical properties of a hydraulic component and the prospects of application of this type of active composite component are discussed References | Related Articles | Metrics

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Use of fracture mechanics concept to interpret crack resistance behavior of fiber reinforced concrete TANG Wan-min , LIU Xiao-yu, WANG Xiao-ming 2004, 23(6): 40-42.  Abstract ( )   PDF (110KB) ( )   The K-superposition method has been improved in this paper to interpret the crack arresting mechanism of fiber reinforced concrete. A simple and direct approach has been introduced based on the Linear Elastic Fracture Mechanics (LEFM). The behavior of fibers in the process of crack arresting has been revealed fundamentally. It has been shown that the stress intensity factor due to the fiber is extremely great at the moment the crack just strides cross the crack, which greatly reduces the total a... References | Related Articles | Metrics

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Use of fracture mechanics concept to interpret crack resistance behavior of fiber reinforced concrete YI Zhi-jian, YANG Qing-guo, LI Zu-wei, DENG Wei-dong , ZHONG Ning 2004, 23(6): 43-45.  Abstract ( )   PDF (135KB) ( )   The K-superposition method has been improved in this paper to interpret the crack arresting mechanism of fiber reinforced concrete. A simple and direct approach has been introduced based on the Linear Elastic Fracture Mechanics (LEFM). The behavior of fibers in the process of crack arresting has been revealed fundamentally. It has been shown that the stress intensity factor due to the fiber is extremely great at the moment the crack just strides cross the crack, which greatly reduces the total a References | Related Articles | Metrics

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The analysis of mechanics mechanism of overweight traffic effect on concrete pavement early failure YANG Xi-wu, WANG Dong, ZHANG Zu-tang 2004, 23(6): 46-49.  Abstract ( )   PDF (156KB) ( )   A result of overweight traffic investigation is given in the paper. Based on the result of investigation, the stress and deformation in different position of concrete pavement slab under overweight traffic are calculated by finite element method. The concrete slab early failure mechanics mechanism under overweight traffic action is analyzed. It comes to a conclusion that fatigue life of concrete pavement lab will be reduced greatly under overweight traffic action. References | Related Articles | Metrics

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The BP ANN model of concrete strength HUANG Zhi-tang,YANG Zhi-gang 2004, 23(6): 50-52.  Abstract ( )   PDF (95KB) ( )   This paper establishes a BP ANN model with 3 layers through analyzing the influence of concrete strength. After the classification and standardization of the sample, the BP ANN model is trained and simulated. The results indicate that the stimative values calculated by the BP ANN model have the enough accuracy compared with the actual values, and its accuracy can satisfy the demand of the engineering References | Related Articles | Metrics

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Geology characteristic of red-layer soft rock in western region and its influence to the roadbase construction stability WU Guo-xiong, ZHANG Bin, YANG Ying-xing, CHENG Qiang 2004, 23(6): 53-58.  Abstract ( )   PDF (289KB) ( )   The influence of red-layer soft rock to the high grade highway construction is great. This paper expatiates the distributes of red-layer soft rock in western region in China and its geology characteristic, describes the rock construction characteristic and engineering characteristic of the red-layer soft rock, including the transform characteristic, the anti-shear strength characteristic, water reasonableness speciality and soft rock mezzanine problem, on the basis of this, further analyzing the References | Related Articles | Metrics

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Study on the mechanics performance of emery cement concrete ZHENG Jian-ming, WU Guo-xiong, WANG Jin-si 2004, 23(6): 59-62.  Abstract ( )   PDF (138KB) ( )   It is clear that adding the emery into the cement concrete could improve the cement concretes abrasion resistance. However, if can emery improve mechanical performance of the cement concrete is a question need to research. This research analyze the emerys effect to the mechanical performance of cement concrete by large number of experiments and give the type of emery and quantity for different cement concrete to get the emery cement concrete that have fine mechanical performance to meet need References | Related Articles | Metrics

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Experimental study on the performance of the asphalt mixtures modified with granulated polymer HAN Sen, ZHANG Cai-li, GAO Jun, MI Jun 2004, 23(6): 63-66.  Abstract ( )   PDF (142KB) ( )   This paper studied the modification effects of granulated polymer-PR PLAST on asphalt mixtures by a large number of laboratory tests using different contents of the polymer. It is pointed that the rutting-resistance of mixture under high temperature is enhanced with the polymer contents and the Dynamic Stability (DS) is increased by 3 times on 0.5% polymer contents. And water-susceptibility is improved on some degree and cracking-resistance under low temperature is modified a little. References | Related Articles | Metrics

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Experimental study on the photo-Oxidization of geosynthetics ZHENG Zhi-neng，,LING Tian-qing,Li Dong-sheng 2004, 23(6): 67-69.  Abstract ( )   PDF (84KB) ( )   Experiments are made on geosynthetics in order to explore the photo-oxidization rule. The results are as following: photo-oxidization degrades the geosynthetics and its mechanics performance, the carbon retards the aging rate of geosynthetics, geosynthetics configuration affects its aging performance References | Related Articles | Metrics

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Erosion mechanism and protection measures of highway subgrade along bend river ZHANG Qi-zhe, LING Tian-qing，CHEN Ping-yan 2004, 23(6): 70-73.  Abstract ( )   PDF (171KB) ( )   In this paper, the erosion mechanism of highway subgrade along bend river has been studied by using theory analysis and model experiments. The analysis about the circulation flow creation, development features and subgrade slope sediment movement laws in the curved channel have been made. It could been found that highway subgrade erosion should be resulted from bend flow scouring and subgrade failure. Finally, the methods of subgrade protection along bend river have been brought forward References | Related Articles | Metrics

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Research on establishment of stability reliability and goal reliability of embankment LIU Lang 2004, 23(6): 74-77.  Abstract ( )   PDF (186KB) ( )   To decide the goal reliability of the method of embankment structure design is a very complicated problem, involving the balance of consideration in terms of engineering and economy. Calibration can only determine goal reliability from the point of security and engineering and fails to reflect economic factor. Hence the establishment of economic assessment mode within the service life of highway and the introduction of reliability optimization to determine embankment structure hole much signific References | Related Articles | Metrics

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An investigation of model test of deformation on high fills embankment soaked in water FAN Liang 2004, 23(6): 78-82.  Abstract ( )   PDF (207KB) ( )   The investigation results of model test of deformation on high fills embankment soaked in water are presented in this paper. Several factors, such as water level, height of embankment, reinforcement, property of filling, have an important effect on cross-range displacement and vertical displacement of high fills embankment. The following are some results of the test . In high water level the cross-range displacement and vertical displacement of the embankment are more remarkable than that in low References | Related Articles | Metrics

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The main problems for processing soft soil under small scale bridge and culvert of highway DING Jin-wen,HUANG Wen-you，WU Jin-liang 2004, 23(6): 83-85.  Abstract ( )   PDF (112KB) ( )   It is very important to structure stabilization and driving safety in the future that soft soil under small scale bridge and culvert of highway is processed well or not. The 5 problems should be paid attention on the soft soil under small scale bridge and culvert: soft distinguish, processing order, conditioning factor, choice of processing method, construction process. References | Related Articles | Metrics

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Experimental study on the soil infiltration characteristics at the area of the Three Gorges reservoir WANG Ping-yi,, ZHAO Chuan 2004, 23(6): 86-89.  Abstract ( )   PDF (132KB) ( )   A series of experimental studies on the main factors of soil and water are conducted at the area of the Three Gorges reservoir, including soil physical characteristics, infiltration characteristics, the relationship between rainfall intensity and infiltration energy, and so on. The results show that the specific weights of soil particles under the different experimental fields are basically same, the value of the specific weights is 2.65~2.70t/m3. The soil density at the forest floors is smaller References | Related Articles | Metrics

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The research of principle of process structure analysis of highway projectbase on nerve tree WANG Shou-xu 2004, 23(6): 90-96.  Abstract ( )   PDF (225KB) ( )   Because the needs of using unit are distinction, project work systems are difficulty to unite thought the highway proceed , so action are distinction on differ area and differ project, and operations are disorder in management. In This paper , using nerve tree , study the method and principle normalization of breakdown, from needs of work systems References | Related Articles | Metrics

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Study on the optimization methods of bus network based on adapted genetic algorithm TANG Ke-fu, WU Da-wei 2004, 23(6): 97-101.  Abstract ( )   PDF (153KB) ( )   Advanced Public Transportation System (APTS) is an important component of Intelligent Transportation System (ITS), which is a front research field of transportation all over the world .The research content discussed in this paper is the bus network optimization problem, which is a vital premise and basis of implementing APTS. However, with a practical size problem , the conventional techniques are facing the challenge to effectively and efficiently solve those complicated network design problem References | Related Articles | Metrics

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The investigation on the safety of road traffic in Wulong county ZHOU Ji-hong, ZHAO Xin-cai, JIANG Zhi-quan, ZHU Shun-ying, ZHOU Jing-cuan 2004, 23(6): 102-105.  Abstract ( )   PDF (116KB) ( )   Wulong county, Chongqing, is a mountain county with multi-rivers locate in the western part of China. Its road traffic condition is complex, the ratio of severe and very severe road traffic accidents was high and the status of traffic safety was severe. The accidents had close relationship with the execution of traffic laws, the imperfects of road design and management, and some environment factors References | Related Articles | Metrics

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Traffic impact analysis of Jiefangbei CBD(Ⅱ) LI Shu-qing, XU Guang-rong,REN Qi-liang,LI Zhi-ying 2004, 23(6): 106-110.  Abstract ( )   PDF (136KB) ( )   According to the road traffic characteristics of the impact scope of Jiefangbei CBD ,the paper used the idea of traffic impact analysis to bright up road rebuilding or improvement project plans and traffic organization plans, evaluated the effects of all the plans, recommended the proper definition and scale of CBD development References | Related Articles | Metrics

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Conceptive design of Zhongshan mass transit service system YANG Jun-qin,CHEN Yuan-xiang 2004, 23(6): 111-114.  Abstract ( )   PDF (185KB) ( )   This paper makes a conceptive design of Zhongshan mass transit service system, based on the research of the present condition of Zhongshan mass transit and Zhongshan city development planning, and applying the update technology on the mass transit. This will provide system framework for the following detailed planning of mass transit References | Related Articles | Metrics

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The application of linear regression forecast and control in logistics activity-based costing LI Hui 2004, 23(6): 115-117.  Abstract ( )   PDF (104KB) ( )   This paper introduced Activity-Based Costing of logistics, analyzed cost constitutes and the related relation between Activity-Based Costing and the cost of logistics, used linear regression forecast and control principle to foresee the logistics cost and control the quantity of logistics activity.It discussed the calculation and prediction of the cost of multi-activity logistics and measured the principle of optimization.The given example verified the correctness of this principle which has cer References | Related Articles | Metrics

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Calculation and analysis of spray characteristics of fuel containing dissolved gas SHAO Yi-ming, TAN Dan-ping, TIAN Mao-sheng 2004, 23(6): 118-120.  Abstract ( )   PDF (124KB) ( )   This paper presents a study about the effect of injection pressure on the spray characteristics of diesel fuel containing dissolved gas (CO2), using LDSA and speed photographic equipment. It indicates that dissolving gas into diesel fuel to improve the atomization only work in a specific scope of injection pressure. Meanwhile, according to experiment data, the method of curve fit is used to estimate the droplet SMD of diesel fuel containing dissolved gas of different concentration with differe References | Related Articles | Metrics

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A simulation of air flow for helical inlet port of engine CHEN You-fang, LI Chao-hui, LAN Hua 2004, 23(6): 121-123.  Abstract ( )   PDF (232KB) ( )   The design of helical inlet port is a key point in design of engine which applies stratiform inlet and rare combustion technology. The paper introduced the method in which based on CFD was used to simulate the air flow in the inlet port. This is for craft brother reference only References | Related Articles | Metrics

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The fuzzy control design and simulation for dynamometers LI Chao-hui, CHEN You-fang, ZHANG Yong 2004, 23(6): 124-127.  Abstract ( )   PDF (284KB) ( )   This paper introduce the development of the eddy dynamometers which based on the furry logic theory, it was proved through experiment with MATLAB simulation that fuzzy control is better than original control References | Related Articles | Metrics

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Solving strongly nonlinear oscillation problem of conservative system by using linearization and interpolation perturbation Methods YUAN Yi-wu 2004, 23(6): 128-131.  Abstract ( )   PDF (181KB) ( )   In this paper, using the linearization and the interpolation methods, the author seeks to solve a class of problems of the strongly nonlinear oscillations of the conservative systems. The accuracy of this method is quite well and is better than that of the improved L-P method References | Related Articles | Metrics

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Study on the times and spaces innate character HU Cheng-hua 2004, 23(6): 132-133.  Abstract ( )   PDF (90KB) ( )   The entire world is made of material in absolute sport state. The essential quantities describing material sport in physics are time and space. But until now, there are not consistent and objective definitions to them. The article through analysis summaries that the appearance of material distribution does not repeat. Thus, it can clearly define the quantities of time and space , and further uncover their innate character References | Related Articles | Metrics