模块化装配式钢结构桁架梁承载力性能研究  

RESEARCH ON BEARING CAPACITY PERFORMANCE OF THE TRUSS GIRDER IN THE MODULAR PREFABRICATED STEEL STRUCTURE

作　　者：倪真[1] 赵越[1] 刘学春[1,2] 张爱林[1,2] 

机构地区：[1]北京工业大学,北京100124 [2]北京市高层和大跨度预应力钢结构工程技术研究中心,北京100124

出　　处：《工业建筑》2014年第8期14-18,共5页Industrial Construction

基　　金：北京市自然科学基金重点项目(13H10089);国家自然科学基金项目(51278010;51248009)

摘　　要：对装配式钢结构住宅体系的钢桁架梁承载力进行研究,采用有限元软件ANSYS建立不同跨度、不同弦杆尺寸的钢桁架梁有限元模型,对其进行非线性静力分析,对比不同参数桁架梁的荷载-位移曲线,对桁架梁的极限承载能力以及变形破坏特性进行分析研究,获得装配式钢结构体系中钢桁架梁的破坏机理。钢桁架梁破坏时塑性区主要在跨中弦杆处,而腹杆相对受力较小,跨中弦杆先于腹杆破坏,满足"强剪弱弯"的设计要求;各桁架梁屈服荷载与极限荷载相差比较大,使得构件从屈服到破坏有较大的延性空间。Nonlinear finite element analysis of the steel truss girder in the fabricated steel structure of housing system was studied in this paper .Finite element models of steel truss girders were established with five different spans and different chord sizes .It was compared the load -displacement curves of the analysis results from different girders , the ultimate bearing capacity and deformation characteristic of the steel truss girder in the fabricated steel structure were studied.The plastic zone mainly occurs at midspan chord when the girder damaged , and webs at a relatively small force damaged after the chord , which could meet the design requirements of “strong shear and weak bending”.The big difference between yield load and ultimate load makes the member have certain safety margin space .

关 键 词：装配式钢结构 钢桁架梁 非线性有限元 

分 类 号：TU391[建筑科学—结构工程]