摘要
选取20个钢框架全焊接梁柱节点局部试件进行单向拉伸和拉压循环试验,记录了试件的破坏模态和应力-应变曲线,分析了材料强度、加载方式、板件厚度、宽度等参数对节点局部焊缝性能的影响,研究了焊缝开裂对节点损伤的影响。试验表明,循环加载会显著削弱焊接试件承载能力和变形能力,导致焊缝的开裂和破坏;焊缝在循环荷载作用下,受压的塑性发展会削弱焊缝延性;焊缝开裂和板件屈曲是节点损伤的两大主要因素,焊缝中裂纹发展导致节点承载力下降和刚度损伤;板件屈服后的局部屈曲对节点的损伤有待进一步研究。
20 specimens, originating from welded beam-to-column connections, were tested under monotonic and cyclic loading. The failure modes and deformation curves were observed. The effects of material strength, loading regime, beam thickness and width were analyzed. The damage characteristics of weld was paid particular attention to. The experimental results reveal that cyclic loading result in the weld failure which weakens the resistance and deformation capacity of welded specimens. The plastic deformation weakens the weld ductility. Weld crack and local buckling cause the connection damage. The resistance and stiffness of specimens constantly are weakened while the crack propagation and the influence of post-yield local buckling needs an in-depth research.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2012年第3期48-55,共8页
Journal of Building Structures
基金
国家自然科学基金项目(90815004)
国家自然科学基金项目(50778102)
关键词
钢节点
单向拉伸试验
拉压循环试验
焊缝损伤
steel connection
monotonic tensile test
cyclic loading test
weld damage
