基于重要杆件失效网架结构连续倒塌动力试验研究

发布时间：2018-02-03 07:38

本文关键词： 连续性倒塌网架结构重要杆件初始破坏失效装置模型试验　出处：《振动与冲击》2015年23期 　论文类型：期刊论文

【摘要】：在网架结构模型中,基于杆件轴力与应变能变化响应的杆件重要性评估方法确定初始破坏杆件并引入失效装置,进行了基于杆件失效的结构连续性倒塌试验。在试验过程中,利用动态应变仪、拉线式位移和加速度传感器,获取网架结构模型因初始破坏引发的动态过程总的应变、位移和加速度时程曲线,揭示网架结构连续性倒塌的破坏过程及破坏机制。仿真分析和试验结果表明,支座之间及其相邻腹杆是网架结构关键杆件,其初始破坏失效后,会造成网架结构的连续性倒塌,在实际设计过程中要加强其构件承载力。
[Abstract]:In the model of grid structure, based on the response of the axial force and strain energy of the member, the method of evaluating the importance of the member is used to determine the initial failure member and introduce the failure device. The continuous collapse test of the structure based on the failure of the member is carried out. In the course of the test, the dynamic strain meter, the linear displacement and acceleration sensor are used. The total strain, displacement and acceleration time history curves of the dynamic process caused by the initial failure of the grid structure model are obtained, and the failure process and failure mechanism of the continuous collapse of the grid structure structure are revealed. The simulation analysis and experimental results show that. The webs between the supports and their adjacent webs are the key members of the truss structure. The failure of the initial failure will cause the continuous collapse of the truss structure and the bearing capacity of the members should be strengthened in the actual design process.
【作者单位】：中国矿业大学江苏省土木工程环境灾变与结构可靠性高校重点实验室;中国矿业大学深部岩土力学与地下工程国家重点实验室;
【基金】：国家自然科学基金项目(51008300) 江苏省自然科学基金项目(BK2011221) 江苏省土木工程环境灾变与结构可靠性重点实验室开放基金项目(JSKL2012YB09)
【分类号】：TU356
【正文快照】： 空间网格结构因初始局部破坏而发生连续倒塌的事故时有发生,如美国康涅狄格州哈特福特市中心正方四角锥网架体育馆因杆件局部失稳导致倒塌破坏,引起美国土木工程界的震惊[1-2]。连续倒塌事件表明:源于结构局部关键杆件初始破坏会使大跨网格结构发生连锁反应式破坏,造成结构部

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