钢框架梁柱节点焊缝损伤性能研究Ⅰ:试验研究
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摘要
选取20个钢框架全焊接梁柱节点局部试件进行单向拉伸和拉压循环试验,记录了试件的破坏模态和应力-应变曲线,分析了材料强度、加载方式、板件厚度、宽度等参数对节点局部焊缝性能的影响,研究了焊缝开裂对节点损伤的影响。试验表明,循环加载会显著削弱焊接试件承载能力和变形能力,导致焊缝的开裂和破坏;焊缝在循环荷载作用下,受压的塑性发展会削弱焊缝延性;焊缝开裂和板件屈曲是节点损伤的两大主要因素,焊缝中裂纹发展导致节点承载力下降和刚度损伤;板件屈服后的局部屈曲对节点的损伤有待进一步研究。
20 specimens,originating from welded beam-to-column connections,were tested under monotonic and cyclic loading.The failure modes and deformation curves were observed.The effects of material strength,loading regime,beam thickness and width were analyzed.The damage characteristics of weld was paid particular attention to.The experimental results reveal that cyclic loading result in the weld failure which weakens the resistance and deformation capacity of welded specimens.The plastic deformation weakens the weld ductility.Weld crack and local buckling cause the connection damage.The resistance and stiffness of specimens constantly are weakened while the crack propagation and the influence of post-yield local buckling needs an in-depth research.
20 specimens,originating from welded beam-to-column connections,were tested under monotonic and cyclic loading.The failure modes and deformation curves were observed.The effects of material strength,loading regime,beam thickness and width were analyzed.The damage characteristics of weld was paid particular attention to.The experimental results reveal that cyclic loading result in the weld failure which weakens the resistance and deformation capacity of welded specimens.The plastic deformation weakens the weld ductility.Weld crack and local buckling cause the connection damage.The resistance and stiffness of specimens constantly are weakened while the crack propagation and the influence of post-yield local buckling needs an in-depth research.
引文
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[2]SAC.Interim guidelines:evaluation,repair,modification and design of welded steel moment framestructures[R].SAC-95-02.Sacramento,CA:SAC,1995:2-16.
[3]Luis F I,Ricardo A M,Helmut K.Hysteretic modelsthat incorporate strength and stiffness deterioration[J].Earthquake Engineering and Structural Dynamics,2005,34(12):1489-1511.
[4]Fisher John W,Dexter Robert J,Kaufmann Eric J.Fracture mechanics of welded structural steelconnections[R].Background report SAC 95-09.Washington DC:SAC,1995.
[5]Kaufmann E J,Fisher J W.A study of the effects ofmaterial and welding factors on moment frame weld jointperformance using a small scale tension specimen[R].Technical report SAC 95-08.Sacramento,CA:SAC,1995:2-50.
[6]石文龙,肖勇,李国强,叶志明.梁柱组合节点的拟动力试验研究[J].地震工程与工程振动,2008,28(6):124-133.(Shi Wenlong,Xiao Yong,LiGuoqiang,Ye Zhiming.Pseudo-dynamic tests oncomposite joints with flush end plate connections[J].Earthquake Engineering and Engineering Vibration,2008,28(6):124-133.(in Chinese))
[7]赵大伟,石永久,陈宏.低周往复荷载下梁柱节点的试验研究[J].建筑结构,2000,30(9):3-6.(Zhao Dawei,Shi Yongjiu,Chen Hong.Experimentalresearch on beam-column connections under cyclicloading[J].Building Structure,2000,30(9):3-6.(in Chinese))
[8]苏迪.考虑组合效应的钢结构梁柱节点抗震性能研究[D].北京:清华大学,2005:36-62.(Su Di.Seismic behavior of beam-column connections in steelstructure with composite effect[D].Beijing:TsinghuaUniversity,2005:36-62.(in Chinese))
[9]石永久,奥晓磊,王元清,施刚.中高强度钢材钢框架梁柱组合节点抗震性能试验研究[J].土木工程学报,2009,42(4):48-54.(Shi Yongjiu,AoXiaolei,Wang Yuanqing,Shi Gang.Experimentalstudy on the seismic performance of beam-to-columncomposite connections in medium-high strength steelframe structures[J].China Civil Engineering Journal,2009,42(4):48-54.(in Chinese))
[10]沈祖炎,沈苏.高层钢结构考虑损伤累积及裂纹效应的抗震分析[J].同济大学学报:自然科学版,2002,30(4):393-398.(Shen Zuyan,Shen Su.Eismic analysis of tall steel structures with damagecumulation and fracture effects[J].Journal of TongjiUniversity:Natural Science,2002,30(4):393-398.(in Chinese))
[11]刘永明,陈以一,陈扬骥.考虑钢框架节点局部断裂的滞回模型[J].同济大学学报:自然科学版,2002,31(5):525-529.(Liu Yongming,Chen Yiyi,Chen Yangji.Hysterical model of steel frame connectionconsidering partial fracture[J].Journal of TongjiUniversity:Natural Science,2002,31(5):525-539.(in Chinese))
[12]JGJ101—1996建筑抗震试验方法规程[S].北京:中国建筑工业出版社,1996.(JGJ101—1996Specification of test methods for earthquake resistantbuilding[S].Beijing:China Architecture&BuildingPress,1996.(in Chinese))
[13]韩林海,杨有福.现代钢管混凝土结构技术[M].北京:中国建筑工业出版社,2004:200-201.(HanLinhai,Yang Youfu.Modern technology of concretefilled steel tubular structures[M].Beijing:ChinaArchitecture&Building Press,2004:200-201.(inChinese))
[14]GB50017—2003钢结构设计规范[S].北京:中国计划出版社,2003.(GB50013—2003Code fordesign of steel structures[S].Beijing:China PlanningPress,2003.(in Chinese))
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