Stretching Control of the Long-Span Roof Structure of Shanghai South Railway Station

摘要

The roof of Shanghai South railway station is a long-span beam-cable hybrid steel structure. The essential role of stretching cables between and under steel beams is to keep whole roof stable under possible load conditions. Using finite element analysis computer program ANSYS, the time-history analysis of seismic response and the stability behavior of the steel roof is calculated. Based on the numerical results, the optimal tension force of cables and reasonable stretching sequence are obtained. Combined with a time-history analysis and a buckling analysis, the tension forces of stretching steel cable are optimized on the basis of guaranteeing no cable slack. Then four kinds of cable stretching schemes are proposed. An optimal one is chosen to ensure cable stress value uniformity and construction convenience. Subsequently, beginning with the ideal state of completed roof, the counter-stretching procedure, in which cables are disassembled in the opposite direction of stretching, is modeled stepwise, and the initial cable force values are obtained to insure a successful stretching construction.