Finite Element Analysis On Cable-Stayed Curved Bridge

Cable-stayed curved bridge is becoming more and more popular because of its graceful shape and adaptability to the selection of the line of the highway and railway. It has a strong competition to the other bridge with the small span in the city. Bridge test has important significance in assess the actual bearing capacity of existing bridge, establishes and accumulates the necessary technical information,promote evaluation theory of old bridge and design theory of new bridge.Based on the cable-stayed curved bridge, this paper uses plate and beam-gird element theory, analyze through space computing model driven by Finite Element Analysis Software. On the test of this bridge, the first job is theoretical analysis and calculation, which are the basis of loading scheme and performance evaluation of the bridge.Aiming at cable-stayed curved bridge, this paper uses plate element and beam-gird element (include shearing deformation and exclude shearing deformation), establishes finite element model of this bridge and contrasts the results of main stress components of this bridge in three different kinds of finite element models under dead weight, determine plate element finite element model is the reasonable analysis model of the bridge.Find out main stress components of this bridge by dead weight analysis (No.6 of upstream cable and No.7 of downstream cable), the loading position of static loading test is confirmed which is the most unfavorable position by influence line analysis, set test car on the most unfavorable position, calculating results meet the current specification requirements, it could realize static loading test operation according to loading standard.Aiming at plate element finite element model of this bridge, modal analysis of cable-stayed curved bridge by subspace iteration method, providing top ten order frequencies and vibration modes. Self-vibration frequency range is from 1.08Hz to 6.07 Hz, mostly in the mode of main beam bending and torsion and bent main tower; Meanwhile, apply time-history analysis method in analyzing the seismic response of the bridge and compare the impact on bridge structure with right-angled stream input and sequent river input respectively.