- 摘 要
-
(1 昆明營造工程設計有限公司， 昆明 650000； 2 漢嘉設計集團股份有限公司， 杭州310005)
［摘要］對落石的沖擊速度進行估算，分析了落石沖擊混凝土柱過程中沖擊力大小和作用時間長短的影響因素，并提出了沖擊力和作用時間的估算公式。采用LS-DYNA軟件對某多層RC框架進行了落石沖擊抗連續(xù)倒塌分析，分析采用動力沖擊彈塑性時程法，混凝土和鋼筋材料本構模型采用歐洲規(guī)范EC2，分析中考慮樓板的拉結作用。分析結果表明，可將被撞擊破壞柱頂節(jié)點豎向變形是否小于限值以及是否達到穩(wěn)定作為抗連續(xù)倒塌整體的判定準則，可將關鍵拉結構件變形是否小于限值以及內力是否達到穩(wěn)定作為構件的判定準則。
［關鍵詞］抗連續(xù)倒塌； 落石沖擊； 拉結構件； 歐洲規(guī)范EC2
中圖分類號： TU318+.1 文獻標識碼： A文章編號： 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
作者簡介：陸偉，本科，工程師，一級注冊結構工程師，Email：43436701@qq.com。
