焊接管节点疲劳研究综述

发布时间：2018-04-22 11:13

  本文选题：桥梁工程 + 焊接管节点　； 参考：《建筑科学与工程学报》2017年05期

【摘要】：为加深对焊接管节点疲劳问题的认识,对焊接管节点名义应力法、热点应力法、切口应力法和断裂力学法4种常用疲劳评估方法应用现状和存在问题进行介绍,从疲劳效应(热点应力集中系数)和抗力(热点应力幅S-N曲线)2个方面对首推的热点应力法研究现状进行总结,探讨了管节点结构形式的发展趋势。结果表明:焊接管节点常用四大疲劳评估方法中名义应力法应用最广,但过于保守,热点应力法最被推崇,但仍有待进一步完善,切口应力法实施难度大,尚未在规范中使用,断裂力学法则适用于剩余疲劳寿命评估;对于传统的圆形和矩形钢管节点,已形成了较为系统的热点应力评估方法,对热点应力集中系数最大值可能发生位置、外推区域、热点应力集中系数计算公式、壁厚效应修正系数等方面进行了明确的规定;在传统的圆钢管和矩形钢管节点基础上,创新节点形式,提出了钢管混凝土节点、PBL加劲型钢管混凝土节点、圆管-方管节点和鸟嘴式节点,对比传统钢管节点,钢管混凝土节点热点应力集中系数降幅在25%以上,PBL加劲型矩形钢管混凝土节点降幅在50%以上,圆管-方管节点和鸟嘴式节点降幅则介于圆形钢管和矩形钢管节点之间。
[Abstract]:In order to deepen the understanding of fatigue problems of welded pipe joints, the application status and existing problems of four common fatigue evaluation methods, nominal stress method, hot spot stress method, notch stress method and fracture mechanics method, are introduced. The current research status of hot spot stress method is summarized from two aspects: fatigue effect (hot stress concentration factor) and resistance (hot spot stress amplitude S-N curve), and the development trend of tubular joint structure is discussed. The results show that the nominal stress method is the most widely used in the four fatigue assessment methods for welded pipe joints, but it is too conservative, the hot stress method is the most respected, but it still needs to be further improved. The notch stress method is difficult to implement and has not yet been used in the specification. The fracture mechanics law is suitable for residual fatigue life evaluation, for traditional circular and rectangular steel pipe joints, a more systematic hot spot stress assessment method has been developed, and the location of the maximum stress concentration factor of hot spots may occur and extrapolate region. The calculation formula of hot spot stress concentration factor, the correction coefficient of wall thickness effect and so on are clearly stipulated, and on the basis of traditional circular steel pipe and rectangular steel pipe joint, the form of joint is innovated. In this paper, PBL reinforced concrete filled steel tube (CFST) joints, circular tube-square tubular joints and bird-beaded joints are proposed, which are compared with traditional steel tubular joints. The decrease of stress concentration factor of concrete-filled steel tubular joints is more than 25% and that of PBL reinforced concrete filled rectangular steel tube joints is more than 50%, while that of circular tube-square pipe joints and bird beak joints is between circular steel pipe joints and rectangular steel tube joints.
【作者单位】： 长安大学公路学院;
【基金】：国家自然科学基金项目(51378068) 国家重点研发计划资助(2016YFC0701202) 中央高校基本科研业务费专项资金项目(310821175015)
【分类号】：U441.4
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本文编号：1786934