焊接残余应力对Y型相贯节点极限承载力影响分析
发布时间：2018-11-12 06:32
【摘要】：采用ANSYS的热-结构间接耦合、生死单元技术模拟Y型相贯节点的焊接过程;将牛顿-拉普森法和弧长法结合,求解Y型相贯节点极限承载力,给出求解流程;分析支管外径与主管外径比、支管倾角、主管径厚比等几何参数对Y型相贯节点极限承载力的影响,将考虑和不考虑焊接残余应力的计算结果进行对比分析。研究结果表明:焊接残余应力降低了Y型相贯节点的极限承载力;支管外径与主管外径比β越大,主管的径厚比γ越小,支管倾角θ越小,则Y型相贯节点极限承载力降低越多;结构设计时,保证强度和安全的前提下选择合适的支管外径、主管壁厚和支管倾角,可减小焊接残余应力对Y型相贯节点极限承载力的影响。
[Abstract]:The welding process of Y-type intersecting joints is simulated by using ANSYS's thermo-structural indirect coupling technique, and the ultimate bearing capacity of Y-type intersecting joints is solved by combining Newton-Raphson method with arc length method, and the flow chart is given. The effects of geometric parameters such as the ratio of branch diameter to superintendent diameter, branch dipping angle and director-diameter thickness ratio on the ultimate bearing capacity of Y-type intersecting joints are analyzed. The calculated results of considering and disregarding the welding residual stress are compared and analyzed. The results show that the welding residual stress reduces the ultimate bearing capacity of Y-joints. The bigger the ratio of branch diameter to top diameter is, the smaller the diameter to thickness ratio of branch pipe is, and the smaller the inclination angle of branch pipe is, the more the ultimate bearing capacity of Y-type intersecting joints is reduced. In structural design, the influence of welding residual stress on ultimate bearing capacity of Y-joint can be reduced by selecting proper branch diameter, wall thickness and inclination angle of branch pipe on the premise of strength and safety.
【作者单位】： 清华大学土木工程系;天津城建大学天津市土木建筑结构防护与加固重点实验室;
【基金】：国家自然科学基金青年科学基金项目(11304168) 清华大学自主科研项目(2012Z10134)
【分类号】：TU392.3
，
本文编号：2326309
[Abstract]:The welding process of Y-type intersecting joints is simulated by using ANSYS's thermo-structural indirect coupling technique, and the ultimate bearing capacity of Y-type intersecting joints is solved by combining Newton-Raphson method with arc length method, and the flow chart is given. The effects of geometric parameters such as the ratio of branch diameter to superintendent diameter, branch dipping angle and director-diameter thickness ratio on the ultimate bearing capacity of Y-type intersecting joints are analyzed. The calculated results of considering and disregarding the welding residual stress are compared and analyzed. The results show that the welding residual stress reduces the ultimate bearing capacity of Y-joints. The bigger the ratio of branch diameter to top diameter is, the smaller the diameter to thickness ratio of branch pipe is, and the smaller the inclination angle of branch pipe is, the more the ultimate bearing capacity of Y-type intersecting joints is reduced. In structural design, the influence of welding residual stress on ultimate bearing capacity of Y-joint can be reduced by selecting proper branch diameter, wall thickness and inclination angle of branch pipe on the premise of strength and safety.
【作者单位】： 清华大学土木工程系;天津城建大学天津市土木建筑结构防护与加固重点实验室;
【基金】：国家自然科学基金青年科学基金项目(11304168) 清华大学自主科研项目(2012Z10134)
【分类号】：TU392.3
，
本文编号：2326309
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