平面钢框架瞬时冲击去柱抗连续性倒塌试验研究
发布时间：2018-10-08 06:39
【摘要】：采用冲击去柱法对两个平面钢框架进行抗连续性倒塌试验研究,重点关注去柱后框架结构的动力反应、倒塌机制以及梁柱受力方式的转变。试验结果表明,在整个倒塌过程中,框架结构经历了弹性受力阶段-弹塑性受力阶段-悬链线形成阶段;框架梁经历了弯曲机制抵抗外荷载到悬链线机制抵抗外荷载的转变;相邻框架柱的弯曲刚度越大,对去柱后形成的双跨梁的约束越强,梁的悬链线效应就越大。对于强梁弱柱型框架结构,由于其框架柱较弱,瞬时去柱后,易发生柱失稳型连续性倒塌。采用ABAQUS6.11对抗倒塌试验进行模拟,模拟结果与试验结果吻合较好。结合试验结果,采用有限元模型分析了平面钢框架倒塌时的动力放大系数和最终倒塌模态。
[Abstract]:The continuous collapse resistance of two plane steel frames was studied by impact de-column method, focusing on the dynamic response of frame structure after column removal, collapse mechanism and the transformation of Liang Zhu's stress mode. The experimental results show that, during the whole collapse process, the frame structure has experienced the elastic stress stage, the elastic-plastic stress stage and the catenary forming stage, and the frame beam has experienced the transformation from bending mechanism to catenary mechanism to resisting the external load. The stronger the bending stiffness of adjacent frame columns is, the stronger the constraint on the two-span beams formed after column removal is, and the greater the catenary effect of beams is. For the frame structure with strong beam and weak column, because of its weak frame column, it is easy to occur the continuous collapse of column instability after instantaneous column removal. The simulation results of ABAQUS6.11 anti-collapse test are in good agreement with the experimental results. Based on the experimental results, the dynamic magnification factor and ultimate collapse mode of plane steel frame are analyzed by finite element model.
【作者单位】： 同济大学土木工程学院;同济大学土木工程防灾国家重点实验室;爱丁堡大学工程学院;
【基金】：国家自然科学基金重大国际合作研究项目(51120185001)
【分类号】：TU391
[Abstract]:The continuous collapse resistance of two plane steel frames was studied by impact de-column method, focusing on the dynamic response of frame structure after column removal, collapse mechanism and the transformation of Liang Zhu's stress mode. The experimental results show that, during the whole collapse process, the frame structure has experienced the elastic stress stage, the elastic-plastic stress stage and the catenary forming stage, and the frame beam has experienced the transformation from bending mechanism to catenary mechanism to resisting the external load. The stronger the bending stiffness of adjacent frame columns is, the stronger the constraint on the two-span beams formed after column removal is, and the greater the catenary effect of beams is. For the frame structure with strong beam and weak column, because of its weak frame column, it is easy to occur the continuous collapse of column instability after instantaneous column removal. The simulation results of ABAQUS6.11 anti-collapse test are in good agreement with the experimental results. Based on the experimental results, the dynamic magnification factor and ultimate collapse mode of plane steel frame are analyzed by finite element model.
【作者单位】： 同济大学土木工程学院;同济大学土木工程防灾国家重点实验室;爱丁堡大学工程学院;
【基金】：国家自然科学基金重大国际合作研究项目(51120185001)
【分类号】：TU391
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