考虑残余应力的高层钢框架梁柱节点焊缝风致疲劳评估  

Wind-induced fatigue assessment of welded joints of high-rise steel frames considering residual stresses

作　　者：李万润[1,2,3] 刘宇飞 方钊 李爱群[1,4] 王辉[2] 杜永峰[2,3] Li Wanrun;Liu Yufei;Fang Zhao;Li Aiqun;Wang Hui;Du Yongfeng(Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education,Southeast University,Nanjing 210096,China;Institute of Earthquake Protection and Disaster Mitigation,Lanzhou University of Technology,Lanzhou 730050,China;School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China;eijing Advanced Innovation Center for Future Urban Design,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,南京210096 [2]兰州理工大学防震减灾研究所,兰州730050 [3]兰州理工大学土木工程学院,兰州730050 [4]北京建筑大学北京未来城市设计高精尖创新中心,北京100044

出　　处：《东南大学学报（自然科学版）》2019年第4期672-678,共7页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51438002);中国博士后基金资助项目(2015M571641);东南大学混凝土及预应力混凝土结构教育部重点实验室开放课题基金资助项目(CPCSME2014-03);甘肃省建设厅科技攻关资助项目(JK2015-38);兰州市科技计划资助项目(2014-1-181)

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.

关 键 词：风致疲劳 子模型法 残余应力 梁柱节点 等效结构应力法 

分 类 号：TU973.254[建筑科学—结构工程]