考虑残余应力的高层钢框架梁柱节点焊缝风致疲劳评估
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摘要
为研究残余应力对高层钢结构节点焊缝风致疲劳性能的影响,结合等效结构应力提出一种考虑残余应力影响的风致疲劳评估方法.首先,利用多尺度建模方法建立某12层钢框架结构多尺度模型,用谐波叠加法模拟脉动风速时程,分析框架结构在风荷载下的整体动力响应;其次,建立含焊缝及工艺孔的梁柱节点局部精细化子模型,模拟焊接温度场及残余应力场;通过施加初始应力场方式考虑残余应力的影响,计算子模型在考虑残余应力时的风致动力响应;最后,结合等效结构应力对焊缝疲劳寿命进行评估.结果表明,结合多尺度方法与子模型技术可实现对此类高层钢结构局部细节的分析,焊接顺序及工艺孔对子模型残余应力分布有一定影响,节点焊缝处残余应力的存在使风致疲劳寿命有所降低,该方法可用于高层钢框架梁柱节点风致疲劳评估.
To study the effect of residual stress on the wind-induced fatigue behavior of high-rise steel structure joint welds, a wind-induced fatigue assessment method considering the influence of residual stress is proposed based on equivalent structural stress. First, the multi-scale model of a 12-storey steel frame structure is established by the multi-scale modeling method. The time history of fluctuating wind speed is simulated by the harmonic superposition method, and the overall dynamic response of the frame structure under the wind load is analyzed. Secondly, a local fine sub-model of beam-column connection with welds and processing holes is established to simulate the welding temperature field and residual stress field. On this basis, the effect of residual stress is considered by applying the initial stress field, and the dynamic response of sub-model under the wind load considering residual stress is calculated. Finally, the fatigue life of steel frame beam-column connection welds is evaluated by the equivalent structural stress method. The results show that the multi-scale method and sub-model technology can be used to analyze the local details of this kind of high-rise steel structure. The welding sequence and welding hole have certain influence on the residual stress distribution of the connections, and the presence of residual stress at the beam-column connection welds results in a reduction in wind-induced fatigue life. The proposed method can be used for the wind-induced fatigue assessment of beam-column connections in high-rise steel frames.
To study the effect of residual stress on the wind-induced fatigue behavior of high-rise steel structure joint welds, a wind-induced fatigue assessment method considering the influence of residual stress is proposed based on equivalent structural stress. First, the multi-scale model of a 12-storey steel frame structure is established by the multi-scale modeling method. The time history of fluctuating wind speed is simulated by the harmonic superposition method, and the overall dynamic response of the frame structure under the wind load is analyzed. Secondly, a local fine sub-model of beam-column connection with welds and processing holes is established to simulate the welding temperature field and residual stress field. On this basis, the effect of residual stress is considered by applying the initial stress field, and the dynamic response of sub-model under the wind load considering residual stress is calculated. Finally, the fatigue life of steel frame beam-column connection welds is evaluated by the equivalent structural stress method. The results show that the multi-scale method and sub-model technology can be used to analyze the local details of this kind of high-rise steel structure. The welding sequence and welding hole have certain influence on the residual stress distribution of the connections, and the presence of residual stress at the beam-column connection welds results in a reduction in wind-induced fatigue life. The proposed method can be used for the wind-induced fatigue assessment of beam-column connections in high-rise steel frames.
引文
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[13] 黄永辉,王荣辉,傅继阳,等.平板焊接接头纵向残余应力修正估算公式[J].工程力学,2014,31(6):218-225.DOI:10.6052/j.issn.1000-4750.2013.03.0274.Huang Y H,Wang R H,Fu J Y,et al.Modified estimation formula of longitudinal residual stress for flat plate welding joint[J].Engineering Mechanics,2014,31(6):218-225.DOI:10.6052/j.issn.1000-4750.2013.03.0274.(in Chinese)
[14] 李青,王岩松,赵礼辉,等.T型板单双面焊接结构的残余应力与变形研究[J].热加工工艺,2017,46(3):197-201.DOI:10.14158/j.cnki.1001-3814.2017.03.056.Li Q,Wang Y S,Zhao L H,et al.Study on residual stress and deformation of single and double side welding structure of T plates[J].Hot Working Technology,2017,46(3):197-201.DOI:10.14158/j.cnki.1001-3814.2017.03.056.(in Chinese)
[2] Yaghoubshahi M,Alinia M M,Milani A S.Master S-N curve approach to fatigue prediction of breathing web panels[J].Journal of Constructional Steel Research,2017,128:789-799.DOI:10.1016/j.jcsr.2016.10.015.
[3] Dong P,Hong J K,Osage D,et al.The master S-N curve method:An implementation for fatigue evaluation of welded components in the ASME B&PV code,Section Ⅷ,Division 2 and API 579-1/ASME FFS-1,WRC Bulletin 523 [R].New York:Welding Research Council,2007.
[4] Dong P,Hong J K,Osage D,et al.Assessment of ASME’s FSRF rules for vessel and piping welds using a new structural stress method[J].Welding in the World,2003,47(1/2):31-43.DOI:10.1007/bf03266376.
[5] Dong P,Hong J K,Osage D A,et al.Master S-N curve approach for fatigue evaluation of welded components[R].New York:Welding Research Council,2002.
[6] 周昊,刘英芳,刘刚,等.考虑残余应力的焊接结构多轴疲劳准则[J].焊接学报,2017,38(11):41-46.DOI:10.12073/j.hjxb.20160114002.Zhou H,Liu Y F,Liu G,et al.Multiaxial fatigue criteria of welded structures considering the residual stress[J].Transactions of the China Welding Institution,2017,38(11):41-46.DOI:10.12073/j.hjxb.20160114002.(in Chinese)
[7] 谌伟,严仁军,徐琳,等.考虑残余应力下焊接接头多轴疲劳损伤研究[J].中国造船,2014,55(2):67-76.DOI:10.3969/j.issn.1000-4882.2014.02.008.Shen W,Yan R J,Xu L,et al.Study on multi-axial fatigue damage of weld joints considering residual stress[J].Shipbuilding of China,2014,55(2):67-76.DOI:10.3969/j.issn.1000-4882.2014.02.008.(in Chinese)
[8] 王文利.风力作用下桅杆结构拉耳焊接节点板裂纹萌生疲劳寿命的评估[D].武汉:武汉理工大学,2012.Wang W L.The fatigue crack initiation life assessment of guyed mast’s earplate welded joint[D].Wuhan:Wuhan University of Technology,2012.(in Chinese)
[9] 李万润,王辉,孙玉萍,等.考虑隔震支座特性的隔震结构多尺度模拟与试验验证[J].工程力学,2018,35(6):115-122,131.Li W R,Wang H,Sun Y P,et al.Numerical and experimental evaluations of base-isolated structure considering bearing isolation behaviors based on multiscale model[J].Engineering Mechanics,2018,35(6):115-122,131.(in Chinese)
[10] 李兆霞,孙正华,郭力,等.结构损伤一致多尺度模拟和分析方法[J].东南大学学报(自然科学版),2007,37(2):251-260.DOI:10.3321/j.issn:1001-0505.2007.02.014.Li Z X,Sun Z H,Guo L,et al.Concurrent multi-scale modeling of structures and damage analyses[J].Journal of Southeast University(Natural Science Edition),2007,37(2):251-260.DOI:10.3321/j.issn:1001-0505.2007.02.014.(in Chinese)
[11] 李爱群,王浩.子模型法在超大跨悬索桥钢箱梁应力分析中的应用[J].工程力学,2007,24(2):80-84.DOI:10.3969/j.issn.1000-4750.2007.02.014.Li A Q,Wang H.Stress analysis on steel box girders of super-long-span suspension bridges with submodel method[J].Engineering Mechanics,2007,24(2):80-84.DOI:10.3969/j.issn.1000-4750.2007.02.014.(in Chinese)
[12] 冯兵.公路正交异性钢桥面板构造细节的热点应力分析及疲劳研究[D].成都:西南交通大学,2014.Feng B.Hot spot stress analysis of the construction details of highway orthotropic deck and fatigue research[D].Chengdu:Southwest Jiaotong University,2014.(in Chinese)
[13] 黄永辉,王荣辉,傅继阳,等.平板焊接接头纵向残余应力修正估算公式[J].工程力学,2014,31(6):218-225.DOI:10.6052/j.issn.1000-4750.2013.03.0274.Huang Y H,Wang R H,Fu J Y,et al.Modified estimation formula of longitudinal residual stress for flat plate welding joint[J].Engineering Mechanics,2014,31(6):218-225.DOI:10.6052/j.issn.1000-4750.2013.03.0274.(in Chinese)
[14] 李青,王岩松,赵礼辉,等.T型板单双面焊接结构的残余应力与变形研究[J].热加工工艺,2017,46(3):197-201.DOI:10.14158/j.cnki.1001-3814.2017.03.056.Li Q,Wang Y S,Zhao L H,et al.Study on residual stress and deformation of single and double side welding structure of T plates[J].Hot Working Technology,2017,46(3):197-201.DOI:10.14158/j.cnki.1001-3814.2017.03.056.(in Chinese)