摘要
支撑作为支撑框架结构体系中最重要的抗侧力构件之一,通常是通过节点板与框架梁、柱连接的。支撑框架结构体系的受力性能很大程度上依赖于节点板的性能。为了对节点板的受压性能进行研究,该文使用大型通用有限元软件ABAQUS开展了一系列的弹塑性屈曲分析。在确定分析模型尺寸时,除节点板厚度(tg)和支撑角度(β)外,该文还提出了2个新的设计参数:支撑端部沿支撑轴线到节点板边缘的距离(L)与节点板Whitmore有效宽度(bE)的比值(L/bE);节点板在支撑两侧为支撑连接件预留的构造宽度(w)。通过这些非线性分析可以发现节点板具有整体失稳和自由边失稳两种类型的失稳模式。该文还对节点板的极限承载力受上述各设计参数的影响规律进行了分析,并据此提出了用于节点板稳定承载力验算的板带计算长度系数公式。
Braces, as one of the most important lateral-load resisting members in braced frames, are commonly connected to beams and columns by gusset plates. The appropriate performance of braced frames largely depends on the performance of gusset plates. To research the compressive behavior of gusset plates, a series of elasto-plastic buckling analyses are conducted by the finite element program ABAQUS. Besides the thickness of the gusset plate （tg） and the brace angle （fl）, there are two new design parameters presented in this research to determine the dimensions of gusset plates. The first one is the ratio of the distance between the end of brace and the edge of gusset plate to the Whitmore width （L/bE）. Another one is the width used for splice members beside the brace （w）. The two buckling modes, global drift buckling and free edge buckling, are derived from the nonlinear analyses. The ultimate strengths of the gusset plates are also investigated with the design parameters. Base on the summarized results of loading capacity, an instructive formula for the calculation of effective length factors in the design of compressed gusset plates is put forward.
出处
《工程力学》
EI
CSCD
北大核心
2013年第2期219-225,共7页
Engineering Mechanics
基金
国家自然科学基金面上项目(51178145)
<钢结构设计规范>国家标准管理组科研专项基金项目(GB500172010-20)
关键词
支撑框架
节点板
受压性能
稳定承载力
计算长度系数
braced frame
gusset plate
compressive behavior
stability bearing capacity
effective length factor
