- 摘 要
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(湖南大學土木工程學院 長沙 410082)
【提要】 總結了實際工程中相貫線焊縫易出現的焊接缺陷類型及其特點,采用ANSYS程序定量分析結果繪制了背景工程中檢測到的焊接缺陷對鋼管直接相貫節(jié)點極限承載力的影響曲線。根據影響曲線得出如下結論和建議：嚴格按焊接規(guī)程構造的相貫線焊縫不會降低節(jié)點的極限承載力,但焊縫是影響節(jié)點極限承載力的關鍵部位之一；各類缺陷均具有一定的容限,對于半徑或長度為2mm及其以下的球型、線型缺陷、咬邊缺陷,包括1mm及其以下的裂縫缺陷,建議允許其在焊縫中存在,比此更大的缺陷應給予清除,較大的焊瘤缺陷也應給予磨除清理；對焊接缺陷的現行評定標準偏嚴,應制訂和完善專門針對建筑鋼結構的評定驗收標準,加強對焊縫缺陷檢測新方法和新設備的研究。
【關鍵詞】 建筑鋼結構 焊接缺陷 極限承載力 鋼管結構相貫節(jié)點
Research of Welded Defect Types and Influence on Ultimate Strength of Directed Welded Tubular Jionts/Shu Xingping, Ren Senzhi(Steel Structural Institute of Hunan University,Changsha 410082,China)
Abstract:The welded defect types and their characteristics are summarized in the welded lines of directed welded tubular joints in actual project,and with ANSYS program,quantificational analysis and the influence curves of welded defect are presented for the ultimate strength of directed welded tubular joints that have been inspected in project.According to the influence curves, the following conclusion and propose are given: it would not reduce the ultimate strength of the tubular joints according to the looks transversal welded line that the rules of welding are constructed strictly,but the welded line is one of the key position influencing the ultimate strength of the tubular joints;all kinds of defects have certain tolerance, as to radius or length for 2mm and following ball type,line type defect,borderline gap defect,including 1mm and the following crack defect,propose allowing to exist in the welded line,the defect greater than that should be removed,the bigger welded tumour defect should be rubed by clear up.
Keywords:building steel structure; welded defects; ultimate strength; directed welded tubular joints
