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的一个重要内容。为研究框架结构在中柱突然失效后结构的动力反应、内力重分布和破坏形态,进行了1/2比例的三层3×3跨钢筋混凝土框架模型的倒塌试验。试验中采用氢气炮将中柱模型击溃,通过分析破坏瞬间结构的位移反应、加速度反应、钢筋应变以及试验后裂缝的开展情况,研究了结构在偶然荷载作用下的变形和内力重分布及破坏状态。试验结果表明,按照抗震规范设计的钢筋混凝土框架结构在突然撤除中柱后具有较好的防连续倒塌能力,材料在瞬时荷载作用下强度的提高有利于减小动力效应对结构的影响。并利用SAP2000有限元分析软件进行了对比分析。
The failure mechanism of structures under accidental loads is an important part of structural design. In order to study the dynamic response, internal force redistribution and failure modes of the frame structure after a sudden failure of the central column, a half-scale collapse test of a three-layer 3 × 3 RC frame model was carried out. In the experiment, the hydrogen column was used to crush the mid-column model. The displacement, acceleration, rebar strain and crack propagation after transient damage were analyzed. The deformation and internal force redistribution and failure of the structure under accidental loading . The test results show that the RC frame structure designed according to the seismic code has good capability of preventing continuous collapse after the sudden removal of the center pillar. The increase of the strength of the material under the instantaneous load helps to reduce the influence of the dynamic effect on the structure. And made use of SAP2000 finite element analysis software for comparative analysis.