大跨度连续梁桥延性和减隔震设计  

Ductility and Seismic Mitigation and Isolation Design of Long Span Continuous Girder Bridges

作　　者：毛玉东[1] 李建中[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《桥梁建设》2016年第3期92-97,共6页Bridge Construction

基　　金：国家自然科学基金项目(51278371)~~

摘　　要：为研究大跨度连续梁桥合理的抗震设计方法,以一座(100+160+100)m变截面连续梁桥为背景进行分析。采用动力非线性反应程序SAP2000建立桥梁模型,选取6条实际地震动输入,比较利用桥墩延性进行抗震设计、利用摆式支座进行减隔震设计(分别假设桥墩保持弹性和允许桥墩屈服)时桥梁的地震响应。结果表明:利用桥墩延性抗震设计可能导致固定墩较大的延性需求,从而导致桥墩严重损伤;采用减隔震设计要求桥墩保持弹性,可能导致桥墩较大的地震弯矩和剪力;采用减隔震设计容许桥墩进入延性,可有效减小桥墩的延性需求,从而控制固定墩的损伤。To investigate the reasonable seismic design strategy for the long span continuous girder bridges,a non-uniform section continuous girder bridge with span arrangement（100＋160＋100）m was cited as an example and was analyzed.The model for the bridge was established,using the nonlinear dynamic response program SAP2000,6real ground motions were selected as the seismic input and the seismic responses of the bridge under the seismic design using the pier ductility and under the seismic mitigation and isolation design using the friction pendulum bearings（respectively assuming that the piers remained elastic and the piers were allowed to yield）were compared.The results reveal that the seismic design using the pier ductility may result in the great ductility demand of the fixed pier and will consequently cause severe damage to the pier.The seismic mitigation and isolation design requires that the piers should remain elastic,which may cause the piers to have the great seismic moment and shear forces.However,the using of the seismic mitigation and isolation design and the allowance of the piers into the ductility can effectively reduce the ductility demand and can consequently control the damage to the fixed pier.

关 键 词：连续梁桥 大跨度梁桥 延性抗震设计 减隔震设计 桥墩屈服 抗震性能 

分 类 号：U448.215[建筑科学—桥梁与隧道工程] U442.55[交通运输工程—道路与铁道工程]