挡块对规则连续梁桥简化抗震分析方法的影响  

Effects of retainer on simplified seismic analytical methods for regular continuous girder bridge

作　　者：徐略勤[1,2] 李建中[2] 

机构地区：[1]重庆交通大学,重庆400074 [2]同济大学,上海200092

出　　处：《世界地震工程》2013年第2期124-131,共8页World Earthquake Engineering

基　　金：交通部西部交通建设科技项目(200831800098)

摘　　要：根据Megally等人的试验结果,提出了钢筋混凝土横向抗震挡块的简化滞回分析模型,并以之讨论了挡块对规则连续梁桥横向地震反应的影响,以及对两种常见的简化抗震分析法(一是忽略挡块、二是横向按固结处理)可靠性的影响。通过参数分析后发现:按忽略挡块进行抗震分析会高估结构的位移需求而低估其力的需求,而固结的方式则可能导致相反的结果,两种方法的可靠性与挡块的强度密切相关。挡块的抗震性能对桥梁墩柱的性能状态(弹性/塑性)有显著影响,而强度设计合理的挡块在地震作用下不仅可以发挥良好的"限位功能",而且可以满足桥梁结构多水准设防的性能要求。A simplified hysteretic analytical model of the transverse reinforced concrete seismic retainer was proposed based on the experimental results published by Megally et al. Applying this model, influences of the retainer on the transverse seismic response of a regular continuous girder bridge was investigated and the reliability of two simplified analytical methods for seismic bridge design, i.e. ignoring the effects of the retainer （method I ） and taking transverse connections between the girder and the piers to be fixed （method II） , was discussed. The results show that method I overestimates the displacement demand and underestimates the force demand in the bridge, and method II likely leads to the opposite. The reliability of these two methods is closely related to the strength of the retainer. The seismic performance of the retainer has a significant impact on the behavior of pier. The retainer with appropriately designed strength not only functions well in restraining the displacement response of bridges, but can also satisfy the perfo rmance criteria corresponding to multi -level fortification for bridges.

关 键 词：挡块 抗震性能 规则连续梁桥 简化分析方法 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]