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（中建科技有限公司深圳分公司， 深圳 518052）

［摘要］采用數(shù)值模擬分析方法，對(duì)采用交錯(cuò)桁架結(jié)構(gòu)體系的工程實(shí)例進(jìn)行多遇地震和罕遇地震下的整體受力分析，探討其抗連續(xù)倒塌性能特點(diǎn)。計(jì)算結(jié)果表明：結(jié)構(gòu)平面布置規(guī)則、豎向剛度均勻時(shí)，在多遇地震作用下，層間變形較小，各項(xiàng)指標(biāo)均滿(mǎn)足規(guī)范要求；罕遇地震作用下，結(jié)構(gòu)最大層間位移角小于規(guī)范限值，可實(shí)現(xiàn)“大震不倒”的抗震性能要求；交錯(cuò)桁架結(jié)構(gòu)體系的水平及豎向關(guān)鍵構(gòu)件失穩(wěn)后，結(jié)構(gòu)端部桁架桿件雖然屈服，但未發(fā)生整體穩(wěn)定性破壞，結(jié)構(gòu)不會(huì)發(fā)生跨塌；柱發(fā)生破壞時(shí)，柱端縱梁及桁架形成轉(zhuǎn)換梁效應(yīng)，將上部柱傳遞下來(lái)的荷載進(jìn)行重分配，結(jié)構(gòu)不會(huì)發(fā)生連續(xù)性倒塌。

［關(guān)鍵詞］交錯(cuò)桁架； 關(guān)鍵構(gòu)件； 整體穩(wěn)定； 動(dòng)力性能； 抗連續(xù)性倒塌

中圖分類(lèi)號(hào)：TU318文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2020)07-0037-07

Dynamic performance analysis of a staggered truss structural system

SUN Zhanqi, WANG Hongxin, WANG Qinghua, LI Xiaoli, WANG Ning, QIU Yong

(China Construction Science & Technology Group Co., Ltd., Shenzhen 518052, China）

Abstract:The method of numerical simulation analysis was used to analyze the overall mechanism of staggered truss structural system under frequent and rare earthquakes, and the characteristics of its resistance to progressive collapse were discussed. The calculation results show that when the structure is arranged in a regular plane and the vertical stiffness is uniform, under the action of frequent earthquakes, the interlayer deformation is small and all indicators meet the requirements of the code. Under the rare earthquake, the maximum interlayer displacement angle of the structure is less than the specification limit value, which can achieve the seismic performance requirement of “not collapsing under the rare earthquakes”. After the horizontal and vertical key members of the staggered truss structural system are destabilized, although the truss members at the end of the structure have yielded, the overall stability failure has not occurred and the structure is not collapse. When the column is damaged, the longitudinal beams and trusses at the end of the column form the transition beam effect, which redistributes the loads transferred from the upper columns, and there is no progressive collapse for the structure.

Keywords:staggered truss; key member; overall stability; dynamic performance; anti-progressive collapse

*十三五國(guó)家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目（2016YFC0701500，2017YFC0703609）。

作者簡(jiǎn)介：孫占琦，學(xué)士，教授級(jí)高級(jí)工程師，一級(jí)注冊(cè)結(jié)構(gòu)工程師，Email: sun.zhq@cscec.com。