【摘要】 利用桥梁专用分析软件MIDAS/Civil建立大跨度连续梁桥多点激励数值模拟模型,采用国际上常用的Elcentro波作为加速度时程输入,在考虑行波效应和桩-土-结构相互作用的情况下,利用时程分析法求得结构在主跨跨径、固定墩纵向抗推刚度和边中跨比等结构参数下的响应峰值。通过数值分析比较,表明增大主跨跨径对结构抗震不利,减小固定墩纵向抗推刚度对结构抗震有利,边中跨比对结构抗震利弊兼半。综合分析各种结构参数,主跨跨径对结构抗震最为敏感。更多还原

【Abstract】 Numerical simulation model of long span continuous bridge under multi-support excitations has been built with the special analysis software for bridge-MIDAS/Civil.The commonly used El centro wave is put into the model as an acceleration time interval.The peak response under different structural parameters,such as under vertical anti-push rigidity of fix girder,middle and main span,structural parameters of side and middle span and etc.are calculated with time interval analysis method.Through the numerical analysis and comparison,we have found that lengthen the main span is detrimental to anti-seismic,reduce the anti-push rigidity of fix girder is beneficial to anti-seismic,side and middle span ratio has both advantages and disadvantages to anti-seismic.Through a comprehensive analysis to various structural parameters,we get the conclusion that the main span will mostly influence the anti-seismic.更多还原