拉索支座减隔震桥梁自适应推倒分析方法

Pushover Analysis Method of Cable sliding Friction Aseismic Bearing Bridges

摘要:

以拉索支座减隔震桥梁为研究对象，提出了自适应推倒分析方法(AMPP)，对比多模态推倒分析方法（MPA）和一阶模态推倒分析方法(PO 1)，研究AMPP方法应用于这类桥梁抗震性能评估的可行性及效果.结果表明：推倒分析方法可以成功应用于拉索支座减隔震桥梁的抗震性能评估，AMPP方法对关键参数的计算精度高于一阶模态推倒分析和多模态推倒分析，但多模态推倒方法对下部构件的内力评估精度较好.

关键词:拉索减隔震支座桥梁; 自适应推倒分析方法; 多模态推倒分析; 斜拉桥

Abstract:

An adaptive mass proportional pushover(AMPP) analysis method is proposed for pushover analysis of aseismic bridges with cable sliding friction bearing. Compared with modal pushover analysis(MPA) and first mode pushover analysis(Po 1) method, the applicability and effectivity of AMPP method for seismic performance evaluation of aseismic bridges with cable sliding friction bearing are studied. It turns out that pushover analysis method can be applied to evaluate seismic performance responses of aseismic bridges with cable sliding friction bearing. Compared with Po 1 and MPA, AMPP can lead to the attainment of improved predictions of key response parameters. MPA provides a good estimation for internal forces of substructure elements.

Key words:aseismic bridges with cable sliding friction bearing; adaptive mass proportional pushover(AMPP) analysis method; modal pushover analysis(MPA); cable stayed bridge