西华大学学报（自然科学版）2016，Vol.35Issue(6)：57-63,7.DOI:10.3969/j.issn.1673-159X.2016.06.012
高墩大跨连续刚构桥地震响应需求的模态推倒分析法
Modal Pushover Analysis of Seismic Demand for Large-span Continuous Rigid Frame Bridge with High Piers
摘要
Abstract
Based on the mode decoupling method of multi-degree-of-freedom systems in structural dynamics,modal pushover analysis (MPA) was proposed to be used in the seismic performance evaluation of large-span continuous rigid frame bridges with high piers.In combination with the design spectrum in current Chinese code,the OpenSEES platform was adopted to establish the nonlinear fiber analytical model for a large-span continuous rigid frame bridge with high piers.The MPA method and time history method were compared in estimation of seismic response of the bridge.The results showed that the MPA produces relative large errors in determination of the pier shear forces,especially in the longitudinal direction with the maximum error of 34.73％.In the transverse direction,the MPA method can be used in engineering practice and the maximum error is 26.48％.The MPA method leads to results of pier moment and displacement,which are very close to those of the time history method in both longitudinal and transverse directions.And the calculation precision satisfies the requirements of engineering practice.The analysis results show that the MPA method can be used directly to evaluate with satisfactory accuracy the transverse performance of continuous rigid frame bridges with high piers.While applying this method to assess the longitudinal performance,special attention needs to be paid to the influence of calculation error in shear demand on the final assessment results.关键词
高墩大跨连续刚构桥/模态推倒分析/设计反应谱/非线性时程/地震响应需求Key words
large-span continuous rigid frame bridge with high piers/modal pushover analysis/design spectrum/nonlinear time history analysis/seismic response demand分类
交通工程引用本文复制引用
秦昌,刘津成,徐略勤,李林..高墩大跨连续刚构桥地震响应需求的模态推倒分析法[J].西华大学学报（自然科学版）,2016,35(6):57-63,7.基金项目
交通运输部应用基础研究计划项目(2014319814210) （2014319814210）
大学生创新创业训练计划项目(20140618005) （20140618005）
重庆市基础与前沿研究计划项目(cstc2015jcyjA30014) （cstc2015jcyjA30014）
山区桥梁与隧道工程国家重点实验室培育基地开放基金(CQSLBF-Y14-2). （CQSLBF-Y14-2）
