半刚性连接钢框架内力及侧移的近似计算  

Approximate calculation of internal force and sway of the semi-rigid jointed steel frame

作　　者：陆铁坚[1] 吴继亮[1] 张建军[1] 

机构地区：[1]中南大学土木建筑学院,湖南长沙410075

出　　处：《铁道科学与工程学报》2008年第3期1-5,共5页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(50478092)

摘　　要：考虑梁柱连接的半刚性及P-Δ效应,对结构力学中的弯矩二次分配法和D值法进行修正。采用三参数力学模型模拟半刚性钢框架梁柱节点梁的弯矩-转角性能,用螺旋弹簧模拟节点连接的半刚性,推导了杆端弯矩,转动刚度,传递系数的计算公式。对梁柱刚度进行修正,提出半刚性连接钢框架内力及侧移的近似计算方法。算例表明,梁柱连接的半刚性使结构的内力发生重分布,P-Δ效应使层间侧移增大,设计时必须考虑连接的半刚性及P-Δ效应的影响。本文方法简捷明了,满足精度要求,便于工程实际应用。The secondary-moment distribution method and D - value method of structural mechanics were modified by considering semi-rigid connection of the beam - column node and P-△effect. The calculation formulas of the end moments, the rotation rigidity and the transmission coefficient were derived by using three parameters mechanical model to simulate the moment - rotation of beam - column connections of semi - rigid steel frame and helical spring to simulate semi - rigid connections of the nodes. An approximate calculation method for the internal forces and sway of the semi - rigid jointed steel frame were given by amending the Stiffness of beam and column. The results show that internal forces in the structure is redistributed as a result of connections of semi - rigid steel frame and the story deflections increases as a result of P-△ effect, so the effect of the semi - rigid connection and P-△ effect must be considered in design. The method of this paper is simple and clear, meets the desire of precision and is easy to use for engineering design.

关 键 词：半刚性钢框架 P-△效应 刚度修正 近似计算 

分 类 号：TU973.13[建筑科学—结构工程]