Fatigue Research on Welded Joint of Steel Beam-column Connection

钢梁柱连接焊接接头的疲劳研究

• 批准号: 07650668
• 负责人: MIMURA Hiroaki
• 金额: $ 1.41万
• 依托单位: Tokyo Denki University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650668/
• 关键词: Steel Structure; High Rise Building; Beam-Column Connection; Low-Cycle Fatigue; Wind Load; ひずみ制御実験

The low-cycle fatigue strength of welded joints steel beam-column connection which were subjected repeated stresses wind loads were investigated experimentally.The tested cruciform specimens were modeled boam-to column connection with K-groove of full penetrated and/or partial penetrated welding. And weding methods were CO_2 gas are shielded and submerged are welding.The treatments in welding joint were as welded and/or finished by sander grinder.The results of low-cycle fatigue tests were as follows,1.The weld toe ground increased the crack initiation life, but there were few influences of difference between as weld and finish treatment on the fatigue strength.2.The crack initiation life of as welded joint was about 10% to 20% of one of base metal, and the crack initiation life of toe ground joint was about 20% to 30%. But the fatigue strength of both conditions was about 20% to 30% of one of base metal.3.There were few influence on crack initiation life and fatigue strength difference of welding methods-CO_2 gas are welding and submerged are welding.4.Fractography showed that fracture models were fatigue fracture one with formed striation when strain ranges was under about 1.5% and was ductile fracture one with dimples when strain range was over about 1.5%.

对重复应力风荷载作用下的钢梁柱连接焊接接头的低周疲劳强度进行了试验研究。试验十字形试件采用K型坡口全焊透和/或部分焊透的梁柱连接模型。焊接方法为CO_2气体保护焊和埋弧焊。焊接接头的处理采用砂光机打磨和/或精加工。低周疲劳试验结果如下:1.焊趾磨削提高了裂纹萌生寿命,但原焊和精加工处理的差异对疲劳强度影响不大。2.原焊接头的裂纹萌生寿命约为10%~20%。 母材之一，趾端磨口的裂纹萌生寿命约为20%~30%。但两种工况的疲劳强度均约为母材其中一种工况的20%～30%。3.焊接方法CO_2气体保护焊和埋弧焊对裂纹萌生寿命和疲劳强度差异影响不大。4.断口形貌显示,应变范围在1.5%左右时,断口模型为带条纹的疲劳断口;当应变范围超过约1.5%时,断口类型为带有韧窝的延性断口。 1.5%。

项目成果

安富秀和: "溶接継手部の低サイクル疲労に関する実験的研究" 日本建築学会大会学術講演梗概集 C-1. 465-466 (1996)

安富英和：“焊接接头低周疲劳的实验研究”日本建筑学会年会摘要C-1 465-466（1996）。

江森靖: "溶接継手部の低サイクル疲労に関する実験的研究" 日本建築学会大会学術講演梗概集 C-1. 441-442 (1995)

Yasushi Emori：“焊接​​接头低周疲劳的实验研究”日本建筑学会年会学术演讲摘要C-1 441-442（1995）。

Hidekazu YASUTOMI: "Low-cycle fatigue behavior of welded joint in structural steel" Summaries of Technical papers of Annual Meeting of A.I.J.465-466 (1996)

安富英和：“结构钢焊接接头的低周疲劳行为”A.I.J.465-466年会技术论文摘要（1996年）

江森靖: "溶接継手部の低サイクル疲労に関する実験的研究" 日本建築学会大会学術講演梗概集C-1. 441-442 (1995)

Yasushi Emori：“焊接​​接头低周疲劳的实验研究”日本建筑学会年会学术演讲摘要C-1 441-442（1995）。

安冨秀和: "溶接継手部の低サイクル疲労に関する実験的研究" 日本建築学会大会学術講演梗概集C-1. 465-466 (1996)

安富英和：《焊接接头低周疲劳的实验研究》日本建筑学会年会学术讲座摘要C-1 465-466（1996）。