冷弯薄壁型钢节点刚度的数值分析和预测模型

Numerical Analysis and Prediction Models for Bolted Joints of Cold-Formed Steel Frames

通过对Byran公式进行修正得出多层板单螺栓搭接节点初始拉伸柔度的计算模型;随后分析了节点板厚度、螺栓安装容差、螺栓端距等参数对修正系数及初始拉伸柔度的影响;在此基础上推导出冷弯薄壁型钢梁柱节点初始转动刚度的预测模型.结果表明,对半刚性的冷弯薄壁型钢梁柱节点而言,采用线性模型能取得较精确的结果.研究结果为冷弯薄壁型钢门式刚架的设计提供了一定的参考建议.

In this paper,the initial tensile flexibility model for multi-layer bolt joints was established by correcting the Byran formula with a modification coefficient.Then a series of parametric studies were conducted to investigate the effect of shell thickness,bolt hole tolerance and edge distance on the value of coefficient and initial tensile flexibility.Based on this,aprediction model for initial rotational stiffness of the beam to column bolted joints in the cold formed steel（CFS）portal frames was further proposed.The results show that using a linear model can achieve more accurate results for the beam to column bolted joints.This result can provide some reference for the design of CFS portal frames.