城市曲线匝道桥有限元建模及抗震性能评估

摘要

Several problems which should be paid attention to during the finite element modeling are discussed in view of structural characteristics of urban curved ramp bridges. Taking the real bridge engineering as project background, seismic response of the bridge subjected to earthquake action El and E2 is analyzed by adopting linear and nonlinear time history analysis. The seismatic performance is evaluated according to guidelines for seismic design of highway bridges and the theory of capacity protected design. The results show that aseismatic performance of the ramp bridge can meet the criterion of no structural damage subjected to earthquake action El and traffic under speed limit by strengthening subjected to earthquake action E2.%针对城市曲线匝道桥的结构特点,探讨了曲线匝道桥抗震分析时应注意的若干问题.以某一实际工程为背景,采用线性及非线性时程反应分析方法分析了该桥在E1、E2地震作用下的地震反应,并根据公路桥梁抗震设计细则和能力保护设计原则进行了抗震性能评价.结果表明:该匝道桥能够满足规范“E1地震作用下结构不坏,E2地震作用下震后经加固可限速通车”的抗震性能.