Analysis of Seismic Isolation and Aseismic Optimization Design of Steel-concrete Composite Beams
In order to ensure the optimal seismic design performance of steel-concrete composite beams,this paper takes the long-span trough steel composite continuous beam bridge with the main span of 138 meters across the channel of Huangjiang River as an ex-ample to optimize the multiple parameters of the seismic isolation bearing.The bearing size,lead core diameter and hardening rate are selected as the analysis parameters,and the longitudinal bending moment and transverse bending moment at the bottom of the pier are selected as the objective function.Define the structure synthesis objective function W.Firstly,based on the parameter analysis of orthog-onal test method,the optimal parameter combination of seismic performance of steel-concrete composite beam bridge is determined.Secondly,the range analysis method is used to analyze W,and the sensitivity and significance of structural design parameters to seismic performance are obtained.The results show that the optimal seismic performance of the steel-concrete composite beam bridge is as fol-lows:the bearing size is1 300 mm×1 300 mm,the lead core diameter is190 mm,the hardening rate is0.20,and the bending moment of the longitudinal pier bottom is reduced by 41.9%and the transverse pier bottom is reduced by 30.5%compared with the original design scheme.The sensitivity degree of the parameters from strong to weak is the size of the support,the hardening rate and the diame-ter of the lead core.
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