The Antiseismic-characteristic Analysis Of Cable-stayed And Truss Bridge

Cable-stayed and truss bridge is one new style bridge for 20 years developing which belongs to high-order statically determinate structure and inner force calculating complicated. The performance is not definite of this bridge is stressed by dynamic load, especial for occasional load(e.g.seismic load and wind load).Study the entire stress-characteristic of cable-stayed and truss bridge by Kaziwan Bridge in the Three Gorges .Select performance and response of structure to analyze by seismic load, expecting the conclusion can guide engineering design and engineering construction.Specific to say, this paper analyze the antiseismic characteristic of Kaziwan Bridge mainly using Ansys finite elements program, including:1. Based on master the basal characteristic and analyzing principle, further studies on the unique characteristic of Cable-stayed and truss bridge;2.According to the design engineering construction drawing and theory of simulation, establish the three-dimensional model of main bridge using Ansys preprocessor program;3.Based on majorization the model of main bridge, analyze the dynamic characteristics of main bridge after modal analysis;4.Choosie and input suitable earthquake waves, then analyze the temporal-displacement and the temporal-inner force acting on seismic load. It is draw a conclusion that the general stress-characteristic of Cable-stayed and truss bridge.In addition, this paper analyze the way of temporal-analyse including:1.How to determine the earthquake waves of appointed location of bridge;2.Alaylze bridge pier's moving module and Establish the dynamic equation by ground movement;3.Extraction the principle how to choose earthquake waving which suitable to physical circumstances, and how to process the temporal-analyse of seismic with Ansys program;4. Extraction the analyse method which suitable to Cable-stayed and truss bridge including the coupling contribution in seismic balanced eqution.