钢结构框架中组合梁等效刚度的确定方法  

A Simplified Method for Equivalent Stiffness of Composite Beam with Semi-rigid Connections

作　　者：刘清平[1] 李国强[1] 王静峰[2] 

机构地区：[1]同济大学,上海200092 [2]清华大学,北京100084

出　　处：《力学季刊》2008年第4期601-607,共7页Chinese Quarterly of Mechanics

基　　金：国家杰出青年科学基金资助项目(50225825)

摘　　要：刚接或半刚性连接的组合梁在荷载作用下,在梁的长度范围内既有正弯矩作用段,又有负弯矩作用段,由于组合梁截面在正弯矩作用和负弯矩作用下截面抗弯刚度不一致,因而在弯矩为零的点处梁的截面抗弯刚度发生突变,而组合梁框架分析的关键是确定组合梁刚度突变分界点的位置及确定在整体分析中所采用的等效梁的刚度。本文根据应变能相等的原理对钢结构框架中组合梁的等效抗弯刚度进行了研究,推导了其等效刚度的表达式,并给出不同荷载作用形式下刚接框架组合梁等效刚度简化计算公式,为组合梁钢框架的整体分析提供了便利。最后分析了水平荷载以及梁柱连接特性对组合梁等效刚度的影响,分析结果表明,采用本文提出的组合梁等效刚度进行半刚性连接框架整体分析偏于安全。The composite beam is composed by steel beam and concrete slab. Under vertical loads, the moment distribution along the beam can be divided into positive moment and negative moment. For the characteristic of composite beam, its sectional flexural stiffness under positive moment is different under negative moment. The sectional flexural stiffness mutates at the location where the moment is zero. According to the law of equivalent strain energy, the simplified expression for determining the equivalent stiffness of composite beam in steel frame was presented. The simplified method is feasible for analysis of the composite beam steel frame. The influences of lateral loads and semi-rigid connection on the equivalent stiffness of composite beam were analyzed. And the results show that the equivalent stiffness derived by the proposed method is a conservative result.

关 键 词：半刚性连接 组合框架梁 等效刚度 简化计算 

分 类 号：TU311.3[建筑科学—结构工程]