Comparison of various procedures for progressive collapse analysis of cable-stayed bridges  

作　　者：Jian-guo CAI Yi-xiang XU Li-ping ZHUANG Jian FENG Jin ZHANG 

机构地区：[1]Key Laboratory of C&PC Structures of Ministry of Education, Southeast University, Nanjing 210096, China [2]Department of Civil Engineering, Strathclyde University, Glasgow, UK

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2012年第5期323-334,共12页浙江大学学报（英文版）A辑（应用物理与工程）

基　　金：supported by the National Natural Science Foundation of China(No. 50478075);the Jiangsu "Six Top Talent" Program of China(No. 07-F-008);the Priority Academic Program Development of Jiangsu Higher Education Institutions;the Scientific Research Foundation of Graduate School of Southeast University (No. YBJJ0817),China

摘　　要：Alternate path(AP) method is the most widely used method for the progressive collapse analysis,and its application in frame structures has been well proved.However,the application of AP method for other structures,especially for cable-stayed structures,should be further developed.The four analytical procedures,i.e.,linear static,nonlinear static,linear dynamic,and nonlinear dynamic were firstly improved by taking into account the initial state.Then a cable-stayed structure was studied using the four improved methods.Furthermore,the losses of both one cable and two cables were discussed.The results show that for static and dynamic analyses of the cable-stayed bridges,there is large difference between the results obtained from simulations starting with either a deformed or a nondeformed configuration at the time of cable loss.The static results are conservative in the vicinity of the ruptured cable,but the dynamic effect of the cable loss in the area farther away from the loss-cable cannot be considered.Moreover,the dynamic amplification factor of 2.0 is found to be a good estimate for static analysis procedures,since linear static and linear dynamic procedures yield approximately the same maximum vertical deflection.The results of the comprehensive evaluation of the cable failure show that the tread of the progressive failure of the cable-stayed bridges decreases when the location of the failed cables is closer to the pylon.Alternate path （AP） method is the most widely used method for the progressive collapse analysis, and its application in frame structures has been well proved. However, the application of AP method for other structures, especially for cable-stayed structures, should be further developed. The four analytical procedures, i.e., linear static, nonlinear static, linear dynamic, and nonlinear dynamic were firstly improved by taking into account the initial state. Then a cable-stayed structure was studied using the four improved methods. Furthermore, the losses of both one cable and two cables were discussed. The results show that for static and dynamic analyses of the cable-stayed bridges, there is large difference between the results obtained from simulations starting with either a deformed or a nondeformed configuration at the time of cable loss. The static results are conservative in the vicinity of the ruptured cable, but the dynamic effect of the cable loss in the area farther away from the loss-cable cannot be considered. Moreover, the dynamic amplification factor of 2.0 is found to be a good estimate for static analysis procedures, since linear static and linear dynamic procedures yield approximately the same maximum vertical deflection. The results of the com- prehensive evaluation of the cable failure show that the tread of the progressive failure of the cable-stayed bridges decreases when the location of the failed cables is closer to the pylon.

关 键 词：Progressive failure Structural failures COLLAPSE Linear analysis Nonlinear analysis Dynamic analysis Cable-stayed bridges 

分 类 号：TU312.3[建筑科学—结构工程]