论文部分内容阅读
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。
In order to compare the design scheme of reducing seismic isolation of railway continuous girder bridges, based on the universal finite element software SAP2000, taking a three-span continuous railway bridge as an example, a full-bridge finite element model of the bridge is established. Based on the seismic isolation design of the lead rubber bearing of the bridge, the isolation and isolation effects of the two design schemes were calculated and analyzed under seven typical seismic waves and the results of the two schemes were compared. The results show that both isolation schemes can achieve a good isolation effect, but the isolation rate of the seismic response of the braking pier is better than that of the brake pier in the case of full-bridge isolation, and the displacement of the bridge is less than Brake pier isolation. Full-bridge seismic isolation design of continuous railway bridge can get better isolation rate under the premise of smaller beam displacement, which is more conducive to the safety of the superstructure of the bridge.