(1 昆明营造工程设计有限公司， 昆明 650000； 2 汉嘉设计集团股份有限公司， 杭州310005)

［摘要］对落石的冲击速度进行估算，分析了落石冲击混凝土柱过程中冲击力大小和作用时间长短的影响因素，并提出了冲击力和作用时间的估算公式。采用LS-DYNA软件对某多层RC框架进行了落石冲击抗连续倒塌分析，分析采用动力冲击弹塑性时程法，混凝土和钢筋材料本构模型采用欧洲规范EC2，分析中考虑楼板的拉结作用。分析结果表明，可将被撞击破坏柱顶节点竖向变形是否小于限值以及是否达到稳定作为抗连续倒塌整体的判定准则，可将关键拉结构件变形是否小于限值以及内力是否达到稳定作为构件的判定准则。

［关键词］抗连续倒塌； 落石冲击； 拉结构件； 欧洲规范EC2

中图分类号： TU318+.1 文献标识码： A文章编号：  1002-848X(2016)S2-0272-06

Study on dynamic impact method of structural resistance to progressive collapse

Lu Wei1， Zhao Liang2

(1 Kunming Yingzao Engineering Design Co., Ltd., Kunming 650000, China;

2 Hanjia Design Group Co., Ltd ., Hangzhou 310005, China)

Abstract: Impact velocity of the rock fall was estimated. Factors influencing on the amplitude of the impact force and contact time was analyzed during the rock fall impacting the concrete column. The estimation formula of the impact force and contact time was proposed. Structural resistance to progressive collapse was analyzed by LS-DYNA software during the rock fall impacting the RC frame with tied slabs, using the dynamic impact elastic-plastic time-history analysis method, while concrete and rebar material constructive models adopt Eurocode2. The analysis shows that, the vertical deformation of the impacted and destroyed column was whether or not less than the limit, as well as whether or not steady, can be used as a macroscopic evaluation criterion for structural resistance to progressive collapse. It also shows that, the transformation of the critical tied components are whether or not less than the limit, as well as the internal forces are whether or not steady, can be used as a evaluation criterion for critical tied components. 

Keywords: structural resistance to progressive collapse; rock fall impact; tied component; Eurocode2

作者简介：陆伟，本科，工程师，一级注册结构工程师，Email：43436701@qq.com。