【作者】 沈禹； 郭安薪；

【Author】 Shen Yu;Guo Anxin;Ministry-of-Education Key Laboratory of Structural Dynamic Behavior and Control,Harbin Institute of Technology;

【机构】 哈尔滨工业大学结构工程灾变与控制教育部重点实验室；

【摘要】 耐震时程法是通过施加幅值不断增大的人工地震动而得到地震响应的动力分析方法。为探索耐震时程法能够通过少量分析获得不同地震动强度下简支梁桥横向地震响应的精确性和有效性,采用Opensees软件建立了考虑结构非线性、桥台以及土-结构相互作用的三跨简支梁桥的三维有限元模型,基于非线性最小二乘法合成了符合中国桥梁抗震规范反应谱的耐震时程曲线,通过数值模拟对比分析了耐震时程曲线输入下桥墩、支座、桥台和桥面板横向响应曲线与真实地震动下增量动力分析法获得的横向响应值。研究发现,三条耐震时程曲线结果与22条天然地震动下的增量动力分析结果在不同桥梁构件中都有较好的一致性;耐震时程法作为一种高效的预测简支梁桥横向响应的方法是可行的。更多还原

【Abstract】 Endurance time method(ETM) is a dynamic analysis procedure,which obtains seismic response by applying artificial accelerograms with the amplitude continuously increasing.In order to explore the accuracy and effectiveness of ETM in acquiring transverse seismic response of simplysupported beam bridges under various intensity levels with less work of analyses,A 3D finite element model of three-span simply-supported beam was built by using the OpenSees software,which takes the structural nonlinear,abutment and soil-structure interaction into consideration.Endurance time accelerograms(ETA) targeting Chinese bridge seismic design response spectrum,were generated based on the nonlinear least square method and the transverse response values of bridge piers,bearings,abutments and decks of incremental dynamic analysis(IDA) under real earthquake records were compared with transverse seismic curves of artificial accelerograms by numerical simulation.The results show that curves of three ETAFs have a satisfactory consistency with curves of IDA with 22 natural ground motions in various bridge components,which indicates that it is feasible for ETM as a novel approach to efficiently predict transverse seismic response of simply-supported bridges.更多还原