竖向荷载下半刚性连接组合框架的实用设计方法(Ⅱ)——梁与柱设计及算例

A Practical Approach for the Design of Semi-Rigid Composite Frames under Vertical Loads (Ⅱ) —Design of Beams and Columns and an Example

虽然在钢框架结构设计中考虑半刚性连接和楼板的组合效应会产生良好的结构经济性,但是在实际工程中仍很难应用,主要原因是缺乏合适简便的设计方法。本文在国内外研究的基础上,结合我国钢结构设计规范GB50017-2003,给出了竖向荷载下半刚性连接组合框架的实用设计建议方法。设计建议方法包括满足两个极限状态的节点、梁、柱设计,较好地解决了梁挠度和柱有效长度系数计算中节点连接刚度的合理选取、半刚性特征对梁挠度和柱计算长度的影响。该方法不仅反映了节点和框架的实际性能,而且简便实用,符合工程师对普通钢框架的设计习惯。本文为全文的第二部分,介绍梁与柱设计。并通过一个算例,说明竖向荷载下半刚性连接组合框架的实用设计过程及经济性。

Keywords Although the benefits of semi-rigid joints and composite action of slab are extensively documented in the design of steel frames,they are not widely used much in practice. The primary cause is lack of appropriate practical design methods. In this article, based on the present research and Code for Design of Steel Structures GBS0017, a practical method suitable for design of semi rigid eomposite frames under vertical loads is introduced. The approach for the design of connec tions, beams and columns at two limit states of semi-rigid composite fratnes is presented,including the selection of connection rotation stiffness in calculating deflection and effective length factor o.f columns. Not only the proposed ap proach takes into account the actual behavior of the semi rigid connections and their influence on the whole structure, but also it is simple for designer to use in practice, This paper is the second one of a pair of papers introducing the design of beams and columns employed in the semi-rigid composite frames. In addition, the procedure of the practical ap, proach for the design of semi rigid composite frames and the advantage of using them are demonstrated with an exam ple.