（1 兰州理工大学土木工程学院， 兰州 730050； 2 西部土木工程防灾减灾教育部工程研究中心， 兰州 730050）

［摘要］采用非线性纤维梁模型建立了关键构件失效后钢管混凝土组合框架抗连续倒塌有限元模型。基于ABAQUS软件提供的二次开发平台UMAT，开发了考虑包辛格效应的钢材和约束效应的核心混凝土材料单轴本构模型,并利用已有文献中的试验结果对上述本构模型进行了验证。在此基础上，进行了不同参数（失效柱位置、跨度、层数、层高及失效时间）下抗连续倒塌特征响应分析，研究不同参数下该类结构的位移变化和倒塌规律。研究结果表明，失效柱位置、跨度以及失效时长对竖向位移时程曲线影响较大；中柱（底层、中间层和顶层）失效后，竖向位移时程曲线为比较规则的振荡衰减曲线，在阻尼作用下按照两条渐近线的趋势逐渐趋于平缓，而角柱失效后计算所得竖向位移时程曲线相对中柱不规则。为了更好地提高钢管混凝土结构的抗倒塌能力，给出了概念性的倒塌设防建议，供工程实际参考。

［关键词］钢管混凝土； 连续倒塌； ABAQUS二次开发； 纤维模型； 参数分析

中图分类号：TU398文献标识码：A文章编号：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

*国家自然科学基金(51268038)，兰州理工大学引进博士启动基金(04-061616)。

作者简介：王景玄，讲师，博士，Email:cewangjx@163.com。