摘要
利用三层柱的框架结构计算模型，引入梁柱线刚度比修正系数，采用螺旋弹簧模拟横梁对柱子的约束弯矩及节点连接的半刚性，考虑连接的非线性弯矩-转角关系，建立梁柱有侧移半刚性连接转角位移方程，推导了有侧移半刚性钢框架柱计算长度系数的公式，本文推导的半刚性连接柱的计算长度系数公式与《钢结构设计规范》（GB50017-2003）中的刚性钢框架柱的计算长度系数形式相同。研究结果表明：有侧移半刚性连接钢框架柱的计算长度系数比刚性连接的钢框架柱的计算长度系数增大6％～14％左右，故在半刚性连接的钢框架柱的稳定和分析中，应考虑梁柱节点的半刚性连接对钢框架稳定性产生的影响。本文引入的梁柱线刚度比修正系数物理意义明确，计算方法简捷方便，便于工程推广。
Using the three-column subassemblage model, the governing equation for determining the effective length factor of columns in sway steel frames with semi-rigid connection is derived by adopting the modified stiffness factor, which considers the effects of the nonlinear moment-rotation characteristics of beam-to-column connections, the semi-rigid connection is simulated by a rotational spring. This paper establishes the slope-deflection equation for semi-rigid connections, the expression of the formula is similar to the formula given in the Code for Design of Steel Structures （GB50017-2003）. It shows that the factors of the columns increase by 6% - 14% compared with the rigid connection. Thereby the influence of the semi-rigid connection should be taken into account in the stability analysis and design of the steel frames. The physical meaning of adopting the modified stiffness factor is very explicit, and the calculation method in this paper is simple and convenient, and easy to use for engineering design.
出处
《建筑科学》
北大核心
2008年第7期16-19,4,共5页
Building Science
关键词
半刚性连接
计算长度系数
弯矩-转角关系
刚度修正系数
semi-rigid
effective length factor
moment-rotation characteristic
modified stiffness factor
作者简介
余卫华（1976-），女，硕士生，讲师 yuweihua317@yahoo．com．cn
