Static And Dynamic Calculation And Elastic-Plastic Stability Analyses Of Prestressed Concrete Extrodosed Cable-Stayed Bridge

The research background is based on a prestressed extrodoesed cable-stayed bridge which has a span of (80+140+80) m with two towers and single cable plane. The integrated model of whole bridge based on beam element is established by utilizing finite element software MIDAS/CIVIL to calculate the stress and deformation of the main parts of the bridge in construction stage and service stage, and analyze the internal force of the main beam in the maximum cantilever state and the bearing capacity limit state and the serviceability limit state in the service state. The natural vibration characteristics of the bridge state are calculated by the integrated model based on beam element, and the seismic response of structures are analyzed by response spectrum method and linear time history analysis method respectively. The stress and deformation of the substructure under the action of the E1 earthquake and the E2 earthquake are checked by the corresponding codes. The integrated model of whole bridge based on solid element is established by utilizing finite element software MIDAS/FEA to calculate the complex spatial stresses of the zero block which is in adverse stress state in construction stage and service stage. Finally, the structural elastic stability is calculated in the maximum cantilever state and service state in the thesis. Based on the ideal elastic-plastic model of concrete, the bearing capacity of towers are explored and analyzed under two conditions that the dead load and live load synchronous growth and only live load growth by layered beam element and layer by layer yield method.