冷弯薄壁型钢自攻螺钉连接抗剪性能试验研究及数值分析Ⅱ:数值分析

Experimental investigation and numerical analysis on shear-bearing capacity for self-drilling screw connections of cold-formed thin-walled steel Ⅱ: Numerical analysis

在试验研究的基础上,利用ANSYS有限元程序,选取合适的单元,通过建立面面接触及模拟实际试验的边界条件,对冷弯薄壁型钢自攻螺钉连接试件进行数值模拟分析,并在自攻螺钉连接破坏模式、荷载变形曲线和抗剪承载力方面与试验结果进行对比分析,验证数值模拟分析方法的可靠性。然后在试验数值模拟分析的基础上,在自攻螺钉直径、连接板件厚度、螺钉排列方式、螺钉个数及螺钉间距等方面,对冷弯薄壁型钢自攻连接件抗剪承载力进行分析,得出单钉连接件的抗剪承载力随螺钉直径的增加而提高;当单钉连接件以螺钉倾斜、连接板件翘起破坏时,其抗剪承载力随连接板件厚度的增加而提高;螺钉数目和螺钉间距是影响螺钉连接抗剪性能的最主要因素。依据参数分析的主要结果,对螺钉连接抗剪承载力的设计方法进行探讨,提出相应的计算方法及构造建议。

Based on the previous experimental investigation and finite element program, a numerical analysis on self-drilling screw connections of cold-formed thin-walled steel was conducted by selecting appropriate elements, using face to face contact model and simulating the actual boundary conditions, Through comparing the numerical results of failure modes, load-deformation curves and shear-carrying capacity with those of experimental results, the feasibility of the numerical analysis method was verified. According to the nurnerical analysis, the influence of parameters such as the diameter of self-drilling screw, the thickness of connections, screw arrangements, and screw numbers and spacing was analyzed. It is found that the shear-carrying capacity of single screw connections increases with the increase of screw diameter, and it is also improved with the thickening of connections when single screw connections are in failure with screw inclining and connect plate titling. Screw numbers and spacing are the major factors to shearing property of screw connections. On the basis of parameter analysis, the design method of shear-carrying for screw connections is discussed, and the corresponding calculation method and constitution are suggested.