Structure Research On Xin Guang Arch Bridge

A long-span steel arch bridge in Xin Guang express way, Guangzhou, Xin Guang Bridge is a tied arch bridge whose arch rib is truss made of steel box girder and I-shaped steel. Traditional arch bridge and V-shaped rigid frame are connected in a creative way. The structure system is Flying-bird-type parallel arch made of steel truss, which is innovative in China. Novel method is provided for increasing the length of arch bridges.Structure feature of Xin Guang Bridge is originative. However, it is under complex forces and it is necessary to do research on the new system. Based on this bridge, this paper has done four parts as the following:1. Static analysis of Xin Guang Bridge. The tie bar is penetrative through the whole bridge of 785m and connected rigidly with the arch rib and the V-shaped rigid frame. How to solve the stress caused by temperature fluctuation is a critical problem. By FEM space model, the stress under temperature and combination of other loads is computed. The combined stress meets the demand of criterion.2. The internal force during construction. There are many conversion of structure system during erection of the bridge. This paper discusses four critical states during the following states:a). Finished state of V-shaped rigid frame.b). Maximal cantilever state of the main span arch rib.c). The closure of the main arch rib;d). The tie bar of main span is stretched.Stress and distortion of critical members is computed in the four phases.3. Research of parameters that are correlative with stabilization of steel arch bridge. This paper discussed the following parameters to see which influence stabilization of this arch bridge most.a). The number, rigidity and location of transverse brace system.b). Rigidity of arch rib chord and web member.c). Rigidity of tie bar.d). Lateral stability under non-directional loads is also computed.4. Static wind loads effect on Xin Guang Bridge finished state. Effect caused by wind velocity is discussed and the critical wind velocity of arch bridges is computed. Comparison between main and side arch rib is also discussed.