高墩塑性铰研究

为了研究高墩结构塑性铰的形成过程、长度，从墩身曲率分布模式入手，以一座连续刚构桥为研究对象，采用增量动力分析的方法，结合OpenSees分析软件，并从PEER数据库中选取15条地震波，完成了一系列非线性分析，得到了不同状态墩身曲率分布规律，据此总结了高墩塑性铰的形成规律、长度及其与地震波的关系．结果表明：地震作用下，高墩曲率分布模式与传统中低墩有差异，但塑性铰形成过程基本一致，且塑性铰的长度及位置与地震波频谱特性、地震强度均无关，仅与结构自身特性有关．

Research on Plastic Hinge of High Pier

In order to study the length and forming process of the plastic hinge and the allowable pier displacement of bridge with high piers and starting from the pier curvature distribution, a continuous rigid frame bridge is taken as an example. Using Incremental Dynamic Analysis method and OpenSees,a series of nonlinear analysis are carried out with the 15 seismic waves selected from the PEER database, getting curvature distribution of different states. The law of the curvature distribution of the piers is given, and then the length and forming process of the plastic hinge which varies with waves are summarized. Results show that the forming process of the plastic hinge to high piers is the same as the traditional low pier;the length of the plastic hinge is independent of the spectral characteristics and earthquake intensity, but only related to the structural characteristics.