【摘要】 地震作用下桥梁结构响应结果的准确性很大程度上依赖于其建立的有限元模型.以一座三跨规则连续梁为例,系统地总结和研究了进行桥梁抗震设计时不同构件和边界条件的模拟方法,并采用3种方法分别建立了集中参数模型、简化模型和精细化模型,在输入相同的地震波后进行非线性时程分析,并对其响应结果进行比较.分析结果表明:采用前两种简化模型计算的结果误差很大,且较难反映支座、横向挡块和伸缩缝等构件的非线性响应;采用精细化模型计算的结果能更准确地反映桥梁结构的多种非线性响应,更好地适用于基于性能的桥梁抗震设计.更多还原

【Abstract】 The accuracy of seismic response results significantly depends on the exactness of the FiniteElement Model(FEM).This paper took a representative three span continuous bridge as an example.The methods for model different components and boundaries of the bridge were summarized and investigated systematically,and three approaches were adopted to establish three nominally identical bridge models.Then,the same seismic record was selected to conduct the time-history analysis,and the response results of the three models were compared.The numerical results have revealed that it is improper to evaluate the bridge seismic behavior with the traditional simplified model because of the error and impreciseness,and the results can hardly reflect the nonlinear response of the bearing,blocking and expansion joint,et al.However,this accurate model can reveal the accuracy and exact seismic response.In addition,it is even more adoptable for the performance-based bridge seismic design.更多还原