桩-土-结构相互作用对结构弹塑性变形特性的影响

在桩-土-结构弹塑性动力相互作用模型研究的基础上,设计了考虑场地类别、输入地震动等因素的基于相互作用模型的多层和高层钢筋混凝土框架结构算例,分析了桩-土-结构相互作用对结构弹塑性变形特性的影响,并与不考虑相互作用的结构底部固端模型的计算结果进行了对比。分析表明:相互作用对结构的弹塑性变形的影响不容忽视,考虑相互作用后梁柱塑性铰出现的程度降低;结构底部位移增加而顶部位移减小;薄弱层的层间位移可能增加而其余层的层间位移则减小。现行的结构弹塑性变形验算方法未考虑土-结构相互作用的做法的合理性值得进一步评判。

Study on influence of pile-soil-structure dynamic interaction on structural elastoplastic deformation

The analysis model of pile-soil-structure dynamic elastoplastic interaction was brought forward.And the cases of concrete frame structures of tier building and tall building,which were based on the interaction analysis model and in which the sites and the earthquake ground motions were considered,were designed.The difference of the elastioplastic deformation between the interaction model and the model not considering the interaction was researched.It is shown that the cumulated effective plastic strain in the beams and the columns is decreased,the displacement at the bottom of the structure is increased and the displacement at the top of the structure is decreased,the drift of weak layers are maybe increased but the draft of other layers are decreased,when the interaction is considered.