Study On The Loading On Influence Surface Of Long-span Cable-stayed Bridge

With the development of computer technology as well as the bridge computation theory,it is necessary to take a thoroughly research on space computation of bridge. The transversedistribution theory is considered to take a three-dimension model into plan analysis. Theadvantage of this method lies in explicit conception and simple calculation while it causesconsiderable errors in anslysing complicated structure.This paper studied the influence surfaceof long-span cable-stayed bridge space loading effect.The main works involved in thisresearch are as follows:Firstly, the domestic and foreign development history and application status ofcable-stayed bridge are introduced, systematically discussed nolinear character ofcable-stayed bridge.The influence surface was built based on automotive method of Linearelastic structure.The Benchmark node displacement mode of commonly used element arecompared according to finite element stress influence function theorem. Detailed elaboratedon China’s bridge code of moving load calculation requirements.Secondly, a three-span two towers cable-stayed bridge model was established in Largegeneral finite element analysis software of ANSYS.The girder was simulated by shell element63and Beam element188. All result data was imported in software Matlab which mapped theinfluence surface.This paper compared the effect of nolinear influence surface and nolinearinfluence line as well as the linear influence surface.Also the parametric contrast betweendifferent influence values under different unit forces is done.Finally, based on initial equilibrium state, the live load effect on linear and nolinearinfluence suface are analyzed.The element grid is refined. The difference of key sectioninternal force responses unde different theory is compared.