论文部分内容阅读
在偶然荷载作用下结构的失效机理是结构设计研究的重要内容。为研究框架结构在边柱突然失效瞬间结构的动力反应、内力重分布和破坏形态,湖南大学与美国南加州大学(USC)、美国加州大学戴维斯分校(UCDAVIS)、美国国家标准技术研究所(NIST)共同进行了1/2比例的3层3跨钢筋混凝土空间框架的倒塌试验。通过研究破坏瞬间结构的位移反应、加速度反应、钢筋应变和裂缝分布情况,揭示结构在竖向构件突然失效时结构的抗倒塌性能。研究结果表明按照抗震规范进行设计的框架结构在底层单个边柱突然失效时具有较好的抗连续倒塌性能,动力效应对结构的影响并不显著。并采用SAP2000有限元软件对结构在竖向构件突然失效时的位移反应、内力变化进行模拟分析,分析结果与试验结果吻和良好。
The failure mechanism of structures under accidental loads is an important part of structural design. In order to study the dynamic response, the redistribution of internal forces and the failure modes of the frame structure at the moment of sudden failure of the side columns, Hunan University and the United States University of Southern California (USC), the University of California at Davis (UCDAVIS), the National Institute of Standards and Technology (NIST) conducted a half-collapse test of a three-story, three-span, three-span reinforced concrete space frame. By studying the displacement reaction, acceleration response, strain distribution and crack distribution of instantaneous structure, the anti-collapse performance of the structure under sudden failure of vertical structure is revealed. The results show that the frame structure designed according to the seismic code has good anti-continuous collapse performance under the sudden failure of the bottom single side column, and the effect of dynamic effect on the structure is not significant. The SAP2000 finite element software was used to simulate the displacement and internal forces of the structure when the vertical component failed suddenly. The analysis results were in good agreement with the experimental results.