本文介绍了大尺寸 T 型管节点钢模型受轴载下,用电阻应变计测量热点应力及测量沿焊缝交线处应力分布的方法,并与薄壳有限元计算、光弹模型试验及参数方程计算的结果作了比较,表明 Wordsworth 和 Smedley 参数方程使用较好。另外,通过测试证实用应变计粘贴在焊趾附近,当应变幅值范围下降15%时可获得裂纹萌生寿命,其方法是可行的。 This paper introduces the method of measuring hot spot stress with resistance strain gage and measuring the stress distribution along the intersection of weld under axial load, and compares it with finite element calculation of shell, photoelastic model test and parameter The results of the equation calculations are compared, indicating that the Wordsworth and Smedley parameter equations are well used. In addition, the test confirmed the use of strain gauges attached to the weld toe, when the strain amplitude range of 15% can be obtained when the crack initiation life, the method is feasible.