Abstract:The final closure process is much important in bridge construction. As a continuous steel truss bridge with large span, Sanguantang Bridge has got great difficulty in it’s final closure of main span cantilever construction. In order to ensure the closure accuracy, the closure section is linked to the main girder at the cantilevered end before overall connection, in a way called temporary locking. However, as the whole structure becomes statically indeterminate after that locking phase, the temperature change creates internal forces in the mechanical system, which attracts our attention. In this paper, we used finite element model based on Sanguantang Bridge project to obtain the stress of temporary connections as well as the stress distribution of the whole structural before and after temporary locking phase, so as to find out the influence of ambient temperature change during final closure process of bridges and to point out some problems that should be paid attention to in actual construction.
