预应力混凝土框架结构的抗震设计方法研究

Study on seismic design procedure of prestressed concrete frame

采用传统抗震设计方法设计的预应力混凝土框架结构,很难实现"强柱弱梁"的抗震设计原则,从而可能在罕遇地震作用下形成危险的柱铰耗能机制。文章将基于弹塑性分析的设计方法引入预应力混凝土框架结构的抗震设计中,旨在通过采用更为合理的抗震设计,使得预应力混凝土框架结构的"混合耗能机制"能够得以实现;最后对2榀预应力混凝土框架结构进行了设计,并对其抗震能力进行了分析。分析结果表明,采用文章介绍的抗震设计方法,能够实现预应力混凝土框架结构预定的耗能机制,且结构的位移响应和构件的变形能够得到控制,因而是一种更为合理的设计方法。

For the prestressed concrete frames designed by means of the traditional seismic design method, the principle of ＂strong-column-weak-beam＂ is difficult to be realized. Therefore, the more dangerous ＂column-hinge energy dissipation mechanism＂ will appear during major earthquakes. In this paper, the seismic design method based on elastoplastic analysis, which belongs to the category of the performance-based seismic design （PBSD） procedure, is introduced into the design of prestressed concrete frames, aiming to find a more reasonable method that will cause the favorable ＂hybrid energy dissipation mechanism＂ to come into being. Based on this kind of design method, two 2D prestressed concrete frames are designed, and their seismic performance is evaluated through pushover analysis. The analysis results indicate that during major earthquakes, the anticipated energy dissipation mechanism can be achieved in the two frames, and drift of the structure can be controlled, thus the dependability of the design method is proved.