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（1 蘭州理工大學(xué)土木工程學(xué)院， 蘭州 730050； 2 西部土木工程防災(zāi)減災(zāi)教育部工程研究中心， 蘭州 730050）

［摘要］采用非線性纖維梁模型建立了關(guān)鍵構(gòu)件失效后鋼管混凝土組合框架抗連續(xù)倒塌有限元模型。基于ABAQUS軟件提供的二次開(kāi)發(fā)平臺(tái)UMAT，開(kāi)發(fā)了考慮包辛格效應(yīng)的鋼材和約束效應(yīng)的核心混凝土材料單軸本構(gòu)模型,并利用已有文獻(xiàn)中的試驗(yàn)結(jié)果對(duì)上述本構(gòu)模型進(jìn)行了驗(yàn)證。在此基礎(chǔ)上，進(jìn)行了不同參數(shù)（失效柱位置、跨度、層數(shù)、層高及失效時(shí)間）下抗連續(xù)倒塌特征響應(yīng)分析，研究不同參數(shù)下該類結(jié)構(gòu)的位移變化和倒塌規(guī)律。研究結(jié)果表明，失效柱位置、跨度以及失效時(shí)長(zhǎng)對(duì)豎向位移時(shí)程曲線影響較大；中柱（底層、中間層和頂層）失效后，豎向位移時(shí)程曲線為比較規(guī)則的振蕩衰減曲線，在阻尼作用下按照兩條漸近線的趨勢(shì)逐漸趨于平緩，而角柱失效后計(jì)算所得豎向位移時(shí)程曲線相對(duì)中柱不規(guī)則。為了更好地提高鋼管混凝土結(jié)構(gòu)的抗倒塌能力，給出了概念性的倒塌設(shè)防建議，供工程實(shí)際參考。

［關(guān)鍵詞］鋼管混凝土； 連續(xù)倒塌； ABAQUS二次開(kāi)發(fā)； 纖維模型； 參數(shù)分析

中圖分類號(hào)：TU398文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2017)19-0086-07

Characteristic response and parametric analysis on progressive collapse of concrete-filled steel tubular composite frames

Wang Jingxuan1,2, Wang Wenda1,2, Li Huawei1

(1 School of Civil Engineering, Lanzhou University of Technology， Lanzhou 730050， China; 2 Western Center of Disaster Mitigation in Civil Engineering of Ministry of Education， Lanzhou 730050, China)

Abstract:A progressive collapse finite element model of concrete-filled steel tubular composite frames with failure of key members was established by using nonlinear fiber beam model. Secondary development platform of UMAT based on ABAQUS software was used to develop the uniaxial constitutive model considering bauschinger effect of steel and constraint effect of core concrete, and the constitutive model was verified by experiment results in existing literature. On this basis, characteristic response analysis on progressive collapse was conducted considering different parameters including location of failure column, span, layer number, layer height and failure time, to study displacement change and the progressive collapse law of the structure under different parameters. The study results show that the location of failure column, span and failure time have large impact on vertical displacement time-history curve. After middle columns at bottom layer, middle layer and top layers fail, the vertical displacement time-history curve is regular oscillation decay curve which becomes gentle according to the trend of the two asymptote lines. However, the vertical displacement time-history curve calculated after corner column fail is more irregular than that of middle columns. In order to improve the progressive collapse capacity of concrete-filled steel tubular structures, a conceptual proposal for progressive collapse protection was proposed for reference in engineering practice.

Keywords:concrete-filled steel tube; progressive collapse; ABAQUS secondary development; fiber model; parametric analysis

*國(guó)家自然科學(xué)基金(51268038)，蘭州理工大學(xué)引進(jìn)博士啟動(dòng)基金(04-061616)。

作者簡(jiǎn)介：王景玄，講師，博士，Email:cewangjx@163.com。