Parameter Sensitivity Study of Ultimate Bearing Capacity of Long-span Steel Box Truss Arch Bridge

Jingyi JIANG, Guanheng WANG

School of Civil Engineering & Architecture, Chongqing Jiaotong University, Chongqing 400074,CHINA

Abstract: The ultimate bearing capacity is an important means of evaluate the performance of bridge safety. So it is significant important in the practical engineering to study its influencing factors of ultimate bearing capacity. The influencing factors of ultimate bearing capacity of the structure are analyzed using the spatial finite element model of a Yangtze River Highway Brige. The results show that the in-plane intial geometric defects can’t decrease significanly ultimate bearing capacity, while the out-plane intial geometric defects decrease significanly ultimate bearing capacity. The material strength cause ultimate bearing capacity of the structures to increase in proportion. The temperature have little influence on ultimate bearing capacity of the bridge.

Keywords: Steel truss arch; Ultimate bearing capacity; Finite element method; Influencing factor; Plastichinge; Parameter sensitivity study