钢框架半刚性连接特性的影响分析

Analysis on the influence of semi-rigid connection in steel frame structure

半刚性连接普遍存在于工程中,但在结构设计中,半刚性特性对结构的影响往往被忽视。与铰接和刚接不同,半刚性连接的节点特性不仅影响节点本身的承载力,同时还对结构的内力分配和整体稳定性影响显著。因此,对于采用半刚性节点的钢结构,其设计和计算必须以准确评估节点半刚性特性为前提。详细阐述了半刚性连接的定义和特点,并且通过对典型钢框架结构算例的分析,定量研究了半刚性节点对钢框架结构侧向刚度的影响,另外通过几何非线性和材料非线性分析,研究了半刚性特性对钢框架整体稳定性的影响。通过本论文的研究,一方面为是否需要考虑半刚性特性提供了定量评估方法;另一方面也为半刚性钢框架结构的整体稳定性分析提供了参考方法。

Semi-rigid connection is commonly used in many structures,but the importance of semi-rigid characteristic is not recognized in structure design.Compared with rigid connection or hinge connection,the semi-rigid characteristic does not only affect the capacity of node itself,but also influence the force distribution and global stability.Therefore,the design and analysis for the steel structure with semi-rigid connection should be based on accurate evaluation of node performance.The definition and characters of semi-rigid connection are demonstrated in the paper.An example case is employed to present the influence on lateral stiffness and global stability of steel frame structure.According to the research result given in this paper,a quantitative method for evaluating the node rigid is established.Moreover,a numerical method for analyzing steel frame with semi-rigid connection is proposed in this paper.