裝配式斜撐節(jié)點(diǎn)鋼框架連續(xù)倒塌分析與機(jī)理研究*
舒興平1，胡佳1，姚堯1，盧倍嶸2
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(1 湖南大學(xué)土木工程學(xué)院鋼結(jié)構(gòu)研究所， 長(zhǎng)沙 410082； 2 湖南科技大學(xué)， 湘潭 411201)
［摘要］以某30層裝配式斜撐節(jié)點(diǎn)鋼框架實(shí)際工程為例，通過敏感性指標(biāo)選取關(guān)鍵構(gòu)件，并采用合理的子結(jié)構(gòu)模型進(jìn)行連續(xù)性倒塌過程數(shù)值模擬分析，研究了關(guān)鍵構(gòu)件失效過程中節(jié)點(diǎn)位移及相關(guān)構(gòu)件內(nèi)力變化情況，并從內(nèi)力重分布機(jī)制以及二道防線的失效模式等方面研究其破壞機(jī)理。結(jié)果表明：中柱失效后結(jié)構(gòu)二道防線的塑性發(fā)展區(qū)最先出現(xiàn)在失效層上層與斜撐相連的上弦桿處，該處的塑性繼續(xù)發(fā)展會(huì)形成“轉(zhuǎn)動(dòng)鉸下方”的局部重分布機(jī)制；斜撐對(duì)斜撐域內(nèi)構(gòu)件具有良好的保護(hù)作用，并能有效地調(diào)整中柱失效后結(jié)構(gòu)的內(nèi)力分布模式。［關(guān)鍵詞］斜撐; 斜撐節(jié)點(diǎn)鋼框架; 連續(xù)性倒塌; 動(dòng)力非線性分析; 關(guān)鍵構(gòu)件中圖分類號(hào)：TU312+.3， TU393.3 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2015)17-0054-05
Progressive collapse analysis and mechanism study on prefabricated steel frame structure with inclined brace jointShu Xingping1, Hu Jia1, Yao Yao1, Lu Beirong2(1 Steel Structural Institute of Civil Engineering College, Hunan University, Changsha 410082, China; 2 Hunan University of Science and Technology, Xiangtan 411201, China)
Abstract:Taking a 30-storey prefabricated steel frame structure with inclined brace joints as engineering example, key components were selected through the sensitivity index and rational substructure model was adopted to carry out numerical simulation analysis of progressive collapse process. The joint displacements and internal force changes of the related key components in the process of failure were studied as well as the failure mechanism from perspectives of redistribution mechanism of internal force and the failure modes of second seismic defense line. The results show that the plastic development zone of the second seismic defense line first appears in the upper chord on the upper layer of failure layer connected with the inclined brace after the failure of the middle column. The plastic development will continue to form the partial redistribution mechanism of “rotation hinge-below”. The inclined brace has good protective effect on components in inclined brace domain, and can effectively adjust the internal force distribution mode of the structure after the failure of the column.Keywords: inclined brace; steel frame structure with inclined brace joint; progressive collapse; dynamic nonlinear analysis; key component*國(guó)家自然科學(xué)基金項(xiàng)目（51278178）。作者簡(jiǎn)介：舒興平，教授，博士生導(dǎo)師，Email:shuxingping@sina.com。
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