考虑剪切变形RC框架结构非线性分析  

Nonlinear analysis of RC frame structure including shear effects

作　　者：张强[1,2] 周德源[2] 王宇辉[1] 李培[1] 

机构地区：[1]上海师范大学建筑工程学院,上海201418 [2]同济大学结构工程与防灾研究所,上海200092

出　　处：《四川建筑科学研究》2009年第4期9-11,共3页Sichuan Building Science

基　　金：上海市教育委员会科研创新资助项目(09YZ173);上海师范大学科研基金资助项目(SK200746);上海大学生创新活动计划项目(CH050)

摘　　要：在钢筋混凝土桥梁和高层建筑结构中,由于柱轴压比的限制,在结构中经常形成短柱,地震时易发生脆性剪切破坏而导致结构破坏甚至倒塌。本文基于考虑弹塑性剪切变形的梁柱单元,建立了含短柱框架结构整体非线性分析的计算模型,编制了程序,在截面刚度矩阵中,剪切变形和轴向、弯曲变形不耦合,但是剪切和弯曲力在单元层面耦合。对钢筋混凝土框架结构的静力加载程序试验结果表明,改进后的纤维模型能够较好地描述钢筋混凝土框架整体结构在压、弯、剪荷载共同作用下的非线性性能。In reinforced concrete tall building structures and bridge, the sections of the frame columns are larger and their shear-span ratios are smaller due to the hmitation of the axial-compression ratio of the columns. Some short and even ultra short columns at the bottom floors of the structures are prone to brittle shear failure, which may result in damage and even collapse of the structures because of their poor ductility during earthquakes. On the base of beam-column element considering plastic shearing deformation, this paper presented simulating model of unitary nonlinear analysis of RC frame structure including short column. The program was presented. Shear deformations are thus uncoupled from axial and bending effects in the section stiffness, but shear and bending forces become coupled at the element level because equilibrium is enforced along the beam element. The results of simulation show that the model could describe the nonlinear performance of RC frame structure driven by load including axial compress, bending, and shear effects.

关 键 词：钢筋混凝土结构 纤维模型 非线性分析 剪切变形 

分 类 号：O322[理学—一般力学与力学基础]