高烈度震区预制拼装连续刚构桥延性分析

Ductility Analysis of Prefabricated and Assembled Continuous Rigid Frame Bridges in High-intensity Earthquake Areas

本文基于纤维梁柱单元模型的基本原理,对广佛西环城际铁路4×40m预制拼装连续刚构在罕遇地震作用下进行弹塑性分析,结果表明:在10.5~22m墩高范围内,随着墩高增加,塑性转角、剪力计算值有降低的趋势;箍筋对桥墩的延性影响很大,甚至在某种程度依赖于箍筋配置的合理与否,合理的配置箍筋是一种经济有效的提高抗震性能的方式;采用《铁路工程抗震设计规范》和《城市桥梁抗震设计规范》两种方法验算了该种桥梁桥墩的抗震性能,其弹塑性分析方法和延性抗震成果为其他高烈度震区刚构桥延性抗震设计提供了参考。

Based on the basic principle of the fiber beam-column element model,the elastoplastic analysis of the 4×4Om prefabricated continuous rigid frame in the west Ring of Guangdong under the action of rare earthquakes is carried out.The results show that:in the range of 10.5~22m pier height,the calculated plastic Angle and shear force tend to decrease with the increase of pier height.Stirrup has a great influence on the ductility of pier,and even depends on the reasonable configuration of stirrup to some extent.Reasonable configuration of stirrup is an economical and effective way to improve the seismic performance.The seismic performance of bridge piers is calculated by using two methods,Code for Seismic Design of Railway Engineering and Code for Seismic Design of Urban Bridges.The elastoplastic analysis method and the results of the ductility earthquake can provide a basis for the seismic design of rigid structures in other high-intensity seismic areas.