在罕遇地震作用下，连续梁桥有时可能进入弹塑性状态，结合某轨道交通的高架桥梁工程，采用纤维模型，分析了该桥在地震作用下的受力状态，分析表明，该桥制动墩墩底钢筋在给定地震时程波作用下发生屈服，桥墩进入塑性状态，但非线性位移延性比满足规范要求；该计算结果已为该梁的抗震设计提供依据，分析方法可为同类结构提供参考。%Continuous girder bridges may enter into elastic-plastic stage under rare earth-quakes.Based on one calculation example,the elasto-plastic analysis is given to the bridge,while the most worst cross-sections are replaced by plastic elements which are modeled by fiber elements.Calculated re-sults show that,the steel of the braking pier trend to yield under the rare earthquakes and so the pier en-ters into elastic-plastic stage.But the value of the nonlinear displacement ductility coefficient can satisfy the standard request.The results have been used for the design of the bridge and the methods provide the basis for a seismic design of the bridge.
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