摘要
不同的组合梁构造形式对钢管混凝土框架的抗连续倒塌性能有着显著的影响。参考某实际工程选取一典型2层2跨平面框架,选取钢筋混凝土组合梁、预制空心带肋叠合组合梁以及压型钢板组合梁三种组合梁形式,通过采用Pushdown分析法研究不同类型组合梁对钢管混凝土框架结构抗连续倒塌性能的影响。基于有限元软件ABAQUS,采用精细单元法建立钢管混凝土平面框架进行数值分析,研究其倒塌全过程工作机理,计算荷载-位移曲线、钢梁截面内力。结果表明:三种组合梁框架结构的倒塌破坏都经历弹性阶段、弹塑性阶段、压拱阶段、塑性阶段、混合阶段及悬链线阶段;三种类型的组合梁对组合框架的初始刚度都有明显提高;三种类型组合梁都能延缓塑性铰发生破坏并且对框架结构倒塌过程中各阶段极限承载力都有大幅提升。
Different types of composite beams have a great influence on the progressive collapse resistance capacity of the composite frame with concrete filled steel tubular(CFST)columns.A two-span and two-story CFST plane frame was taken as an example,and three composite beam types of reinforced concrete composite beams,prefabricated hollow ribbed composite beams and profiled steel plate composite beams were selected to analyze the influence of different composite beam types on progressive collapse resistance capacity of CFST frames by using Pushdown analysis method.Based on the finite element software ABAQUS,the paper developed a finite element progressive collapse model of CFST plane structure,and the progressive collapse mechanism was analyzed.The load-displacement curve and the internal force of the steel beam section were calculated.It could be found the failure of three kinds of composite frame structure always experienced several stages,such as the collapse of the elastic stage,elastic-plastic stage,pressure arch stage and plastic stage,mixed stage and catenary stage.All the three types of composite beams had a significant influence on the initial stiffness of the composite frame,and they could delay the plastic hinge damage and greatly improve the ultimate bearing capacity of each stage during the collapse of the frame structure.
作者
张承亮
王景玄
ZHANG Chengliang;WANG Jingxuan(Civil Engineering of Lanzhou University of Technology,Lanzhou 730050,China)
出处
《钢结构》
2018年第11期50-57,共8页
Steel Construction
基金
国家自然科学基金项目(51708270)
甘肃省科技支撑计划项目(1604FKCA107)
关键词
钢管混凝土
现浇混凝土组合梁
预制空心带肋叠合板组合梁
压型钢板组合梁
连续倒塌
有限元分析
concrete-filled steel tube
cast-in-situ floor reinforced concrete composite beam
precast prestressed concrete composite hollow composite beam
steel deck-concrete composite beam
progressive collapse
finite element analysis
