Load Behavior Analysis On Double Steel Box X-arch Bridge

Arch bridge has been built in west China because of many mountains and rivers. Though the concrete-filled steel tubes bunch grows quickly, it is confined by its material properties. As the steel amount has been the first in the world, it has great sense to generalize the steel arch bridge for west development.This paper discusses the development of recent steel arch bridge. Based on the first Bacellona combination structure, cross-river road bridge-Liuwu bridge, we analysis its load behavior.According to the bridge standard, we analysis the combination structure, simplify it and decompose the complicated space structure into two plane structure hi order to calculation. In connection with its self properties, we make an inquiry into the major parameters, such as ratio of height and span, equation of arch axis, geometry size of section and so on. Building two space structures, by analysis the result of plane model and space model, we get new cognition about it.As a large span steel arch bridge and located in the west plateau, it is necessary to calculate its dynamical action because it belongs to higher anti -seismic lever. Through the three dimension simulation dynamical properties calculation, we get the frequency and vibration mode of this bridge , analysis the feature and give advice to earthquake calculation.