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H形钢悬臂柱柱脚焊缝的疲劳性能对钢柱疲劳寿命起控制作用,应用热点应力的表面外推法,通过建立数值计算模型,对弯矩、扭矩和弯扭共同作用下柱脚焊缝热点应力进行了分析。选取翼缘与底板厚度比(t_1/t_2)、翼缘和腹板厚度比(t_1/t_3)、腹板厚度(t_3)与型钢截面高度(h)作为影响因素,对热点应力集中系数SCFhs进行参数分析。分析结果表明,其它条件不变的情况下,弯矩作用下的热点应力集中系数SCFmhs随着(t_1/t_3)和(t_3)的增大而减小,但与(t_1/t_2)关系不大,h增加可导致SCFhs增大,建议取为1.40;扭矩作用下的热点应力集中系数SCFths随着(t_1/t_2)和(t_3)的增大而减小,但与(t_1/t_3)关系不大,h增加可导致SCFths增大,建议取为1.20;弯扭共同作用下的热点应力集中系数SCFmths随着(M/T)的增大而增大,建议取1.05 SCFths。
The fatigue behavior of H-shaped steel cantilever column foot weld plays a controlling role on the fatigue life of steel column. By applying the surface extrapolation method of hot spot stress, the numerical simulation model is established to analyze the influence of bending moment, Seamless hot stress was analyzed. The ratio of the thickness of the flange to the floor (t_1 / t_2), the ratio of the thickness of the flange to the web (t_1 / t_3), the thickness of the web (t_3) and the height of the section steel (h) were selected as influencing factors. Parameter analysis. The results show that under other conditions, the stress concentration factor SCFmhs decreases with increasing (t_1 / t_3) and (t_3), but not with (t_1 / t_2) , the increase of h can lead to the increase of SCFhs, which is suggested to be 1.40. The hot spot stress concentration factor SCFths decreases with the increase of (t_1 / t_2) and (t_3) under the action of torque, but the relationship with (t_1 / t_3) The increase of large and h can lead to the increase of SCFths, which is suggested to be 1.20. The hot spot stress concentration factor SCFmths increases with the increase of (M / T) under the combined effect of bending and torsion, and 1.05 SCFths is recommended.