Closing scheme and pushing performance analysis of multi-span rigid structure-continuous composite bridge
The closing and pushing scheme of multi-span rigid structure-continuous composite bridge determines the internal force and linear shape of the bridge.In order to choose the best closing and pushing scheme of Dongjiatan Xiangjiang River Bridge(70+5×120+70)m,finite element models were established with finite element software for four different closing schemes when no pushing force was applied.The displacement and stress of the main beam after bridge completion were analyzed by comparison,and two optimal closing schemes were selected.On this basis,three kinds of pushing conditions were obtained by pushing scheme analysis.Under the principle of eliminating the horizontal displacement of the pier top,the pushing force in each working condition was determined.The best closing and pushing scheme was selected by mechanical analysis of the three working conditions under which pushing force was applied.Finally,the local modeling analysis of pushing was carried out for the best closing and pushing scheme.Research results indicate that symmetrically closing the bridge from the side span to the middle span and applying a pushing force of 1 900 kN before the closure of the middle span is the best closing and pushing scheme for the bridge.The local stress of pushing and deformation of the scheme meet the requirements.
rigid structure-continuous composite bridgefinite elementclosing schemepushing force
万方数据
维普
