钢管相贯K形节点焊接残余应力数值分析
Numerical analysis on residualstress in direct welded K-joint of steel tubular members
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摘要: K形钢管相贯焊接节点是大跨越输电钢管塔常用的连接方式,这种节点在连接处的受力情况却较为复杂.在焊接过程中产生的动态应力应变及随后形成的残余应力,是影响节点承载力的主要原因.基于热弹塑性理论,利用ANSYS软件的热-结构耦合功能,采用间接法,并结合单元生死技术,进行节点焊接温度场和应力场的求解,得到了残余应力和残余变形的分布规律.结果表明,相贯焊接节点的残余应力既有拉应力也有压应力,在主管与焊缝交接处最大,这是导致焊缝撕裂的主要原因.此结论为钢管相贯节点的受力性能提供了实用的参考价值.Abstract: The direct welding K-joint of steel tubular members is a kind of usual joint of steel tube tower for large crossing of transmission lines. however, and the attachments of joint are often stressed complexly. The dynamic stress-strain and the subsequent formation of residual stress produce which were in welding process, are the main factors affecting the load capacity. Based on thermoelastic-plastic theory, the use of ANSYS software thermal-structural coupling function and the indirect method, combined with element birth and death technology, for calculation of temperature field and stress field, obtained the distribution of residual stress and residual deformation. The results showed that welding residual stresses both have tensile stress and compressive stress. However, the maximum of residual stress appears in the weld and the chord intersection, which is the main factors that cause weld tearing. This conclusion provides a reference for direct welding joint of steel tubular members of temperature field, stress and deformation analysis.
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Keywords:
- steel tube tower /
- K-joint /
- residual stress /
- temperature field
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