【摘要】 为了对铁路连续梁桥减隔震设计方案进行对比研究,基于通用有限元软件SAP2000,以某三跨铁路连续梁桥为例,建立该桥的全桥有限元模型。对该桥采用铅芯橡胶支座进行减隔震设计,在7条典型地震波激励下对2种设计方案的减隔震效果进行计算分析,并将2种方案的结果进行比较。结果表明,2种隔震方案都能取得较好的隔震效果,但全桥隔震时制动墩地震响应隔震率优于制动墩隔震,且全桥隔震时梁体位移小于制动墩隔震。对铁路连续梁桥进行全桥减隔震设计,可以在较小梁体位移的前提下得到较好的隔震率,更有利于桥梁上部结构的安全。更多还原

【Abstract】 To make a comparative study of isolation plans,a 3-span railway continuous beam bridge was chosen as the example and the finite element model of the bridge was established based on general FEA program SAP2000.The isolation effects of two design plans under seven typical earthquake waves were calculated and analyzed with the bridge isolated by lead-rubber bearings.The comparison results show that both isolation plans have good isolation efficiencies.But the isolation ratios of seismic responses for the whole bridge-isolated plan are better than those for the fixed pier-isolated plan,and the girder displacement responses for the whole bridge-isolated plan are smaller than those for the fixed pier-isolated plan.Better isolation ratios can be obtained with smaller girder displacement in whole bridge-isolated plan,which is good for the safety of the superstructure of the railway continuous beam bridge.更多还原