圆钢管相贯节点平面内受弯的焊缝计算

圆钢管相贯节点平面内受弯时,焊缝的惯性矩是焊缝强度计算的重要几何参量,因此主要对焊缝的空间几何特性如有效截面积及有效截面的惯性矩进行分析。数值分析考虑主管与支管管壁沿相贯线的全周二面角的变化,在有效截面理论的基础上得到焊缝的几何特性。结合有限元分析,最终建立圆钢管相贯节点焊缝有效截面惯性矩的表达方法,提出焊缝平面内受弯的强度计算公式。计算公式与有限元结果的对比表明,基于焊缝几何特性的计算方法可以基本保证焊缝抗弯强度计算的安全性。

CALCULATION OF STRENGTH OF FILLET WELDS FOR TUBULAR JOINTS UNDER IN-PLANE BENDING

The moment of inertia of fillet welds is an important factor for calculation of strength of welds when the tubular joint is subjected to in-plane bending. This paper conducts the analysis of weld profile such as the effective area and the moment of inertia. The numerical method adopts the effective section presumption for welds and takes the consideration of dihedral angle,which is the angle between the chord and the brace surfaces along the intersection line,to evaluate the weld profile. Based on the finite element analysis,the approach formula for moment of inertia and the strength calculation of fillet welds for tubular joints under in-plane bending are proposed. The comparison of the results by the approach formula and finite element analysis indicates the safety of the bending strength calculation of fillet welds by the method based on the analysis of weld profile.