摘要
为了避免热损伤降低建筑钢材焊接节点的疲劳性能,提出建筑钢材焊接节点在热损伤下的疲劳性能研究方法。该方法首先分析了建筑钢材焊接节点的热损伤过程,以此为依据建立建筑钢材焊接节点的热损伤演化方程;其次,设置3个焊接节点,在热损伤下对焊接节点的应变、骨架位移和强度退化程度展开分析,研究热损伤对建筑钢材焊接节点疲劳性能产生的影响。研究结果表明,焊接节点的强度退化程度随着加载位移的增加而增大,在疲劳荷载作用下,焊接节点累积的热损伤越来越多,焊接节点的强度逐渐退化,导致节点出现裂缝,焊接节点的裂缝在反复疲劳荷载作用下逐渐扩大,节点刚度退化。
In order to avoid thermal damage and reduce the fatigue performance of welded joints of building steel,a research method of fatigue performance of welded joints of building steel under thermal damage was proposed.Firstly,the thermal damage process of welded joints of building steel was analyzed,and the thermal damage evolution equation of welded joints of building steel was established based on this method.Secondly,three welded joints were set up to analyze the strain,skeleton displacement and strength degradation degree of welded joints under thermal damage.The research results showed that the strength degradation degree of the welded joint increased with the increase of the loading displacement.Under the fatigue load,the accumulated thermal damage of the welded joint was more and more.Under this condition,the strength of the welded joint gradually degraded,leading to cracks in the joint.The cracks in the welded joint gradually expanded under the repeated fatigue load,and the joint stiffness degraded.
作者
赵敏
ZHAO Min(School of Vocational Education,Xi'an Eurasia University,Xi'an710065,Shaanxi pro.,China)
出处
《焊接技术》
2023年第5期46-50,I0005,I0006,共7页
Welding Technology
关键词
焊接节点
热损伤演化方程
疲劳性能
应变
强度退化
welded joints
thermal damage evolution equation
fatigue performance
strain
strength degradation
