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15 April 2015, Volume 34 Issue 2 Previous Issue    Next Issue

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Analysis of Geometric Nonlinear Behavior of Self-Anchored Suspension Bridge of Large Span Wang Zhen, Luo Bo, Wu Haijun, Zhou Zhixiang, Wang Shenning 2015, 34(2): 1-6.  DOI: 10.3969/j.issn.1674-0696.2015.02.01 Abstract ( )   PDF (972KB) ( )   Considering with geometric nonlinear problem of self-anchored suspension bridge of large span, based on the basic principles of nonlinear analysis, a geometric nonlinear behavior of main cable’s displacement of large span suspension bridge in construction phase and at final stage was studied, by the method of analyzing the bridge’s geometric nonlinearity by loading fractionally. Besides, based on the comparison between theoretical calculation and measured experimental total bridge model test, the geometric nonlinearity characters of the main cable were clarified. The results show that the geometric nonlinearity character of the main cable’s displacement is obvious, and it mainly experiences three segments: linearity character is obvious, nonlinearity character enhances gradually and nonlinearity character reduces gradually. Further analysis shows that the changing rules of the nonlinearity character of a cable band spot under tensioned or not are different: the geometric nonlinearity character in the zero-crossing points of displacement influence line of the main cable is much more obvious than the other parts of the main cable. Under complete bridge stage, the linearity character of the main cable’s displacement is obvious and the load effect fits the superposition principle. References | Related Articles | Metrics

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Accurate Calculation Method of Equal Tensile Force of Parallel Strand Stayed-Cable Zou Li, Peng Xumin, Wei Dongsheng 2015, 34(2): 7-9.  DOI: 10.3969/j.issn.1674-0696.2015.02.02 Abstract ( )   PDF (263KB) ( )   In order to improve the accuracy of the stay cable force, and improve the uniformity of the single steel strand cable force, the existing formula for calculating cable force was revised and perfected, and a more accurate formula for calculating cable force was presented. The existing control method of single steel strand cable force was also revised and perfected, and a more accurate control formula and control method for cable force was presented. These studies were conducted according to the basic theory of equal tensile force method of parallel strand stayed-cable. References | Related Articles | Metrics

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Similarity Law of Scale-Model Test System for Vehicle-Bridge Coupling Vibration Gui Shuirong, Zhang Chao, Chen Shuisheng 2015, 34(2): 10-14.  DOI: 10.3969/j.issn.1674-0696.2015.02.03 Abstract ( )   PDF (386KB) ( )   The similarity laws of bridge-vehicle interaction system were presented based on similarity theories of structure dynamic model test and dynamic property of highway bridge-vehicle coupling vibration. Taken a fictitious simple supported beam bridge as an example, the parameters of vehicle model and bridge model were calculated according to the prototype structure dynamic properties and scale factor of geometry. Comparative analysis of static and dynamic response between prototype bridge and model bridge, verified the vehicle-bridge coupling vibration model similarity law. The results showed that, the scale model test for vehicle-bridge coupling vibration need to satisfy elastic similarity law and gravity similarity simultaneously. References | Related Articles | Metrics

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Investigation of Vehicle Loads on Expressway Bridge under Special Circumstances Zhao Chuan, Dou Yuanming, Sun Jishu 2015, 34(2): 15-19.  DOI: 10.3969/j.issn.1674-0696.2015.02.04 Abstract ( )   PDF (465KB) ( )   The bridge collapses continuously occurred recent years in many provinces. It produced all kinds of fatigue problems when the overloading vehicles frequently passed through the bridge. In combination with the key highway bridges in service in Hebei province, the overloading vehicles load spectrum was monitored. Through the traffic investigation，high frequency vehicle model, the distribution of vehicles flow, the vehicle’s own properties (wheelbase, axle load) and so on were statistically analyzed. According to the principle of equivalent fatigue damage, the model of 5 kinds of daily operation vehicle load was deduced based on the measured data and the fatigue loading spectrum was established. To compare with highway-I automotive design load effect, it is concluded that when the span is less than or equal to 25 m, its vehicle load should be increased to about 1.3 times; When the span is longer than 25 m, its vehicle load should be raised to about 1.2 times. References | Related Articles | Metrics

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Typical Damage Analysis of Bridges During Badong M5.1 Earthquake Zhang Yi, Li Heng, Wang Qiuliang, Feng Qian, Li Jinggang, Li Xue 2015, 34(2): 20-23.  DOI: 10.3969/j.issn.1674-0696.2015.02.05 Abstract ( )   PDF (858KB) ( )   Abstract:The seismic damage of different types of bridges was investigated and roughly analyzed during Badong M5.1 earthquake. The survey results show except a very few bridges were destroyed, the main structures of the bridges had basic security in Badong area, and they could continue to be used after local repairs. References | Related Articles | Metrics

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Analysis of Mechanics Response for Tunnel Anchorage to Dynamic Tension Force from Main Cable Li Ming, Yuan Xiaowei, Chen Qi, Hu Jun 2015, 34(2): 24-27.  DOI: 10.3969/j.issn.1674-0696.2015.02.06 Abstract ( )   PDF (1002KB) ( )   Abstract:By using the finite element software ANSYS, the tunnel anchorage of Puli Bridge was analyzed. The stability of tunnel anchorage under non-dynamic tensile load in the main cable was calculated. When earthquake occurs, with the consideration of anchor piug body to tensile load in main cable, the four corners of the bottom surface and the two vertexes of front and back surface were monitored. Through the stress and stress amplitude analysis of monitored points, it shows that the response of the plug body of former anchor surface is more strongly than that of the back surface. References | Related Articles | Metrics

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Nonlinear Strength Yield Index of Surrounding Rock Stability for Underground Opening Wu Hengbin，Zhang Xuefu 2015, 34(2): 28-32.  DOI: 10.3969/j.issn.1674-0696.2015.02.07 Abstract ( )   PDF (439KB) ( )   According to the analysis of surrounding rock yield index of the Mohr-Coulomb criterion and Drucker-Prager yield criterion, yield index (YI) is proposed based on I1 and J2. Both two methods are equivalent in the linear yield criterion, YI based on I1 is smaller than J2in nonlinear yield criterion, and YI based J2 is suggested. In view of the solution for generalized Hoek-Brown criterion exist mathematical difficulty, the generalized Hoek-Brown strength parameters are converted into the equivalent strength parameters, the yield evaluation of surrounding rock stability is further performed by substituting them into the YI expression of Mohr-Coulomb criterion. In addition, numerical experiments are conducted, and the results show that the law of equivalent plastic strain are similar to that of YI after tunnel excavation and support, the accuracy of YI is verified. YI of tunnel can show the degree of stress concentration and the interpretation law of surrounding rock safety state, describe more accurately the stress state of surrounding rock. References | Related Articles | Metrics

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Analysis of Major Factors Affecting CFG Piles Treating Soft Foundation in Mountain Highway Cai Dongjun, Xie Wen 2015, 34(2): 33-38.  DOI: 10.3969/j.issn.1674-0696.2015.02.08 Abstract ( )   PDF (873KB) ( )   After CFG pile treated the mountain road, its composite foundation bearing capacity, and settlement were affected by many factors. Under Embankment loads, conventional theoretical approach is difficult to analyze the impact of changes in the stress-strain law factors. Finite element analysis software PLAXIS was used to simulate CFG pile composite foundation treatment and embankment construction. Through the analysis of CFG pile length, pile spacing and composite foundation cushion thickness variation, the influence of various factors on the CFG pile composite foundation settlement was summed up, and CFG pile composite foundation pile length,pile spacing and cushion thickness of a reasonable range were analyzed. Ultimately it provides theoretical basis for practical engineering CFG pile composite foundation optimized design. References | Related Articles | Metrics

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Mechanical Property Monitoring on Asphalt Pavement Overlaying on CCP Lv Huiqing, Zhang Xiangwei, Yin Yingmei, Chen Wentao 2015, 34(2): 39-44.  DOI: 10.3969/j.issn.1674-0696.2015.02.09 Abstract ( )   PDF (1249KB) ( )   In order to obtain the inner work information of semi-rigid base asphalt pavement overlaying on the damaged cement concrete pavement(CCP), the sensors were embedded in the test road during construction. And the strain and temprature vabiration of semi-rigid base under multiphysics, such as temperature, fluid and vehicle loads were monitored. The vibrations of semi-rigid base at the beginning of and during the operation after completation were obtained. Based on the inspection results， it is known that the damaged cement concrete pavement has a very large influence on the mechanical response of base. Furthmore, keeping the stability old CCP and the integration of semi-rigid base is the key to control the reflective crack of semi-rigid base asphalt pavement on the damaged cement concrete pavement. References | Related Articles | Metrics

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Evaluation Study of Rock Slope Stability in Alpine High Altitude Region Li Jianfeng, Wan Chen, Zhao Yong 2015, 34(2): 45-49.  DOI: 10.3969/j.issn.1674-0696.2015.02.10 Abstract ( )   PDF (320KB) ( )   For the study of rock slope stability evaluation method of the alpine high altitude region, 12 main evaluation indexes which influence the stability of rock slope in the special area were selected as the evaluation factors of fuzzy evaluation, to build fuzzy comprehensive evaluation model of the system in the alpine high altitude areas by applying of AHP method and fuzzy mathematics theory to determine the weight of each index and membership. Based on this model, the right bank of highway slope stability of the Pangduo Hydro Project was evaluated by fuzzy comprehensive evaluation. The evaluation results objectively reflect the engineering actual situation, which has some practical guiding significance and reference value to analysis and predict of rock slope stability in this kind of region. References | Related Articles | Metrics

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Short-Term Aging Effect on Cryogenic Property of Common Asphalt in Xinjiang Bu Hailing, Liu Tao, Yang Sanqiang 2015, 34(2): 50-53.  DOI: 10.3969/j.issn.1674-0696.2015.02.11 Abstract ( )   PDF (367KB) (