钢筋混凝土框架刚塑性抗震设计方法研究  

Study on rigid-plastic seismic design of reinforced concrete frame structures

作　　者：樊长林[1,2] 张善元[1] 路国运[1] 

机构地区：[1]太原理工大学土木工程学院,山西太原030024 [2]太原城市职业技术学院,山西太原030027

出　　处：《世界地震工程》2009年第3期67-73,共7页World Earthquake Engineering

基　　金：国家自然科学基金项目(10772129);山西省自然科学基金项目(2008021006)

摘　　要：在罕遇地震作用下,钢筋混凝土框架结构通常要经历相当大的塑性变形,地震输入的动能绝大部分转化为塑性变形能而被耗散,仅有很少部分转化为弹性变形能,基于这种能量转化机制,采用刚塑性模型来预测地震反应。同时建议在结构设计时于适当位置预设塑性铰,使结构在强烈地震作用下的能量耗散集中在塑性铰处,并保证结构整体性,从而达到结构大震不倒的设防水准。以塑性理论为基础,发展了一种适用于钢筋混凝土框架结构刚塑性抗震设计方法。文中最后以5层钢筋混凝土框架为例给出了分析结果,并与弹塑性时程分析进行了对比,两者的一致性是相当满意的。由此表明,刚塑性抗震设计方法概念清晰,计算简单,具有可靠精度,可以满足罕遇地震作用下钢筋混凝土框架结构抗震设计要求。Under strong earthquake a reinforced concrete frame usually undergoes large plastic deformation. Most of kinetic energy rising from the earthquake is dissipated through plastic deformation, and only a little part is conver- ted into elastic deformation energy. In view of the mechanism of energy transformation, a rigid-perfectly plastic model is used for predicting the earthquake response of R C frame structures. In order to avoid structure collapse under strong earthquake, the structures can be designed in such a way of arranging some plastic hinges in appropri- ate locations so that the dissipation of energy is concentrated in plastic hinges, and the entirety of the structures is retained. Based on the theory of plasticity, a new method of rigid-plastic-seismic-desig/a for the reinforced concrete frame struclures is developed. The application 6f the, method is illustrated by means of an example of a five-story re- inforced concrete frame design. The comparison of results with ones by using non-linear time-history analysis shows good agreement. It follows that the method proposed in this paper has advantages of clear concept, simple calcula- tion and reliable accuracy. It can be used in seismic design for the reinforced concrete frame structures.

关 键 词：刚塑性抗震设计方法 刚塑性模型 倒塌机构 能量耗散 刚塑性反应谱 基于性能抗震设计 

分 类 号：TU375.4[建筑科学—结构工程]