混凝土框架结构随机模拟分析研究  

Random Simulation Study on RC Frame Structure

作　　者：丁光莹[1] 李杰[1] 

机构地区：[1]同济大学建筑工程系,上海200092

出　　处：《力学季刊》2003年第2期231-237,共7页Chinese Quarterly of Mechanics

基　　金：国家自然科学基金(19772034)

摘　　要：本文在双层双跨框架钢筋混凝土结构低周反复荷载下的试验研究的基础上,编制了有限元非线性分析程序。首先利用结构的均值参数对结构进行了确定性的计算分析,分析结果与试验结果的对比表明程序具有相当的正确性。然后在此基础上,利用结构随机模拟的思想,采用分层抽样和两重随机模拟技术对结构进行了最优模拟结果的计算分析。计算结果表明:虽然结构参数只有较小的变异,但最优模拟结果如结构的内力反应与均值参数模拟结果将会出现较大的变异。这一结果说明:结构的非线性力学性能及损伤演化与结构物理参数的变异性存在显著关联。总体强度及刚度分布相似的结构,由于物理参数分布的随机性差异,会导致结构非线性内力分布产生显著变化。Based on the experimental study and analysis of two-storey and two-span RC frame structure subjected to a low cycle and repetitive loads, a nonlinear FEM program was used to simulate the response of the structure. First, the mean parameters were used to deal with a deterministic simulation. Conpared the results with the test results, it is shown that the program is reasonable. Then using the separation level sampling technology and the double stochastic simulation method, optimal results were performed. It is shown that though the parameters only have a small difference with mean parameters distribution, the structural response of the optimal results have an evident difference with the results of structure with mean parameters. It shows that the nonlinear performance and the damage evolution have a remarkable correlation with the variation of systen parameters. Concerning the structures with the approximative distributing strength and rigidity, the randomness of physical parameters distribution would cause the great variety of the nonlinear performance.

关 键 词：框架 混凝土 随机模拟 

分 类 号：TU528.1[建筑科学—建筑技术科学]