十字形内芯全钢防屈曲支撑构件及子系统足尺试验
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摘要
以北京某办公楼实际工程为依托,对内芯为十字形的全钢防屈曲支撑进行支撑构件及子系统足尺试验研究,以了解其性能及合理构造。首先根据性能要求进行初步设计。继而在MTS上对设计的第一根构件进行单轴拉压试验,由于加工精度不足引起的偏心等原因,出现绕弱轴弯曲,试验终止。改进设计制作第二根构件进行试验,内芯在其与外套管点焊位置断裂,表明内芯屈服段除必要的板件之间的连接焊缝外,不应出现额外焊缝连接接头。采用在下端加劲肋处局部加厚方式限制外套管下滑,设计了第三根构件并安装到加载框架上进行子系统足尺试验,完成加载制度时支撑完好,且滞回曲线饱满稳定,受压强度提高系数及累积延性系数均满足规程要求。试验证明,改进后的十字形内芯全钢防屈曲支撑具有良好的延性及耗能能力。
Full-scale uniaxial and subassemblage tests are conducted to study the property and proper configuration of all-steel BRB with cruciform cross section encased in a square steel tube, which is to be installed in a six-floor office building in Beijing. The first BRB specimen was designed according to the client’s requirement, and tested without gusset plates under uniaxial quasi-static cyclic loading by using MTS actuator. The top end bent during the loading process because of the initial eccentricity caused by machining error of the end part. The design is then improved and another BRB specimen is fabricated according to the test results of the first one. Under uniaxial cyclic loading, its core plates are fractured at the weld spots, indicating that there should be no additional weld on the yielding part of the core except the necessary connection between the core plates. For the specimen in the subassemblage test, which includes BRB and gusset plates, thickness of the portion of the rectangle reinforcing ribs outside of the outer tube are increased to restrain the slippage of the tube. No rupture is observed during the subassemblage test, and numerous hysteretic loops are obtained. The compression strength amplification factor and the cumulative inelastic ductility factor satisfy the standard of the SEAOC-AISC recommended provisions. The results show that the improved all-steel BRB with cruciform cross section encased in a square steel tube presents large ductility and high energy dissipation capacity.
Full-scale uniaxial and subassemblage tests are conducted to study the property and proper configuration of all-steel BRB with cruciform cross section encased in a square steel tube, which is to be installed in a six-floor office building in Beijing. The first BRB specimen was designed according to the client’s requirement, and tested without gusset plates under uniaxial quasi-static cyclic loading by using MTS actuator. The top end bent during the loading process because of the initial eccentricity caused by machining error of the end part. The design is then improved and another BRB specimen is fabricated according to the test results of the first one. Under uniaxial cyclic loading, its core plates are fractured at the weld spots, indicating that there should be no additional weld on the yielding part of the core except the necessary connection between the core plates. For the specimen in the subassemblage test, which includes BRB and gusset plates, thickness of the portion of the rectangle reinforcing ribs outside of the outer tube are increased to restrain the slippage of the tube. No rupture is observed during the subassemblage test, and numerous hysteretic loops are obtained. The compression strength amplification factor and the cumulative inelastic ductility factor satisfy the standard of the SEAOC-AISC recommended provisions. The results show that the improved all-steel BRB with cruciform cross section encased in a square steel tube presents large ductility and high energy dissipation capacity.
引文
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[9]李培彬,娄宇,赵广鹏,等.屈曲约束支撑在北京银泰中心结构抗震设计中的应用[J].建筑结构,2007,37(11):5-7(Li Peibin,Lou Yu,Zhao Guangpeng,et al.Using unbonded braces in aseismatic design for steel tower of Beijing Yintai Center[J].Building Structure,2007,37(11):5-7(in Chinese))
[10]芮明倬,李立树,贺军利,等.屈曲约束支撑在古北财富中心高层钢结构中的应用研究[J].建筑结构,2007,37(5):25-28(Rui Mingzhuo,Li Lishu,He Junli,et al.Study and design of high-rise steel structure office building with unbonded braces[J].Building Structure,2007,37(5):25-28(in Chinese))
[11]李国强,胡宝琳,孙飞飞.国产TJI型屈曲约束支撑的研制与试验研究[C]//第十一届高层建筑抗震技术交流会论文集.昆明,2007:523-530(Li Guoqiang,Hu Baolin,Sun Feifei.Development and experimented study of domestic TJI buckling-restrained brace[C].Kunming:Seismic Resistance of High Rise Building Technology Symposium,2007:523-530(in Chinese))
[12]李妍,吴斌,王倩颖,等.防屈曲钢支撑阻尼器的试验研究[J].土木工程学报,2006,39(7):9-14(Li Yan,Wu Bin,Wang Qianying,et al.An experimental study of anti-buckling steel damping-braces[J].China Civil Engineering Journal,2006,39(7):9-14(in Chinese))
[13]马宁,吴斌,赵俊贤,等.全钢防屈曲支撑抗震性能足尺构件试验[C]//第17届全国结构工程学术会议论文集.武汉,2008:118-124(Ma Ning,Wu Bin,Zhao Junxian,et al.Full scale uniaxial tests on earthquake resistant behavior of all-steel buckling-restrained brace[C]//Proceedings of the Seventeenth National Conference on Structural Engineering.Wuhan,2008:118-124(in Chinese))
[14]AISC Seismic provisions for structural steel buildings[S].Chicago,Illinois:American Institute of Steel Construction,2005
[2]Clark PW,Aiken I D,Kasai K,et al.Large-scale testing of steel unbonded braces for energy dissipation[C]//Proceedings of Advanced Technology in Structural Engineering.Philadelphia,USA:Structures Congress,2000
[3]Black C J,Makris N,Aiken I D.Component testing,stability analysis and characterization of buckling-restrained unbonded braces[R].Berkeley:Pacific Earthquake Engineering Research Center,College of Engineering,University of California,2002
[4]Xie Q.State of the art of buckling-restrained braces in Asia[J].Journal of Construcion Steel Research,2006,61(6):727-748
[5]Iwata M,Murai M.Buckling-restrained brace using steel mortar planks:performance evaluation as a hysteretic damper[J].Earthquake Engineering and Structural Dynamics,2006,35(14):1807-1826
[6]蔡克铨,黄彦智,翁崇兴.双管式挫屈束制(屈曲约束)支撑之耐震行为与应用[J].建筑钢结构进展,2005,7(3):1-8(Tsai K C,Hwang Y C,Weng C S.Seismic performance and applications of double-tube buckling-restrained braces[J].Progress in Steel Building Structures,2005,7(3):1-8(in Chinese))
[7]程光煜,叶列平,许秀珍,等.防屈曲耗能钢支撑的试验研究[J].建筑结构学报,2008,29(1):31-39(Chen Guangyu,Ye Lieping,Xu Xiuzhen,et al.Experimental researches on buckling-restrained brace[J].Journal of Building Structures,2008,29(1):31-39(in Chinese))
[8]孙建华,罗开海,王亚勇,等.含屈曲约束耗能支撑的高层建筑地震作用效应分析[J].工程抗震与加固改造,2007,29(4):1-8(Sun Jianhua,Luo Kaihai,Wang Yayong,et al.Analysis of the earthquake load effects of a high-rise building with buckling restrained energy dissipation braces(BREB)included[J].Earthquake Resistant Engineering and Retrofitting,2007,29(4):1-8(in Chinese))
[9]李培彬,娄宇,赵广鹏,等.屈曲约束支撑在北京银泰中心结构抗震设计中的应用[J].建筑结构,2007,37(11):5-7(Li Peibin,Lou Yu,Zhao Guangpeng,et al.Using unbonded braces in aseismatic design for steel tower of Beijing Yintai Center[J].Building Structure,2007,37(11):5-7(in Chinese))
[10]芮明倬,李立树,贺军利,等.屈曲约束支撑在古北财富中心高层钢结构中的应用研究[J].建筑结构,2007,37(5):25-28(Rui Mingzhuo,Li Lishu,He Junli,et al.Study and design of high-rise steel structure office building with unbonded braces[J].Building Structure,2007,37(5):25-28(in Chinese))
[11]李国强,胡宝琳,孙飞飞.国产TJI型屈曲约束支撑的研制与试验研究[C]//第十一届高层建筑抗震技术交流会论文集.昆明,2007:523-530(Li Guoqiang,Hu Baolin,Sun Feifei.Development and experimented study of domestic TJI buckling-restrained brace[C].Kunming:Seismic Resistance of High Rise Building Technology Symposium,2007:523-530(in Chinese))
[12]李妍,吴斌,王倩颖,等.防屈曲钢支撑阻尼器的试验研究[J].土木工程学报,2006,39(7):9-14(Li Yan,Wu Bin,Wang Qianying,et al.An experimental study of anti-buckling steel damping-braces[J].China Civil Engineering Journal,2006,39(7):9-14(in Chinese))
[13]马宁,吴斌,赵俊贤,等.全钢防屈曲支撑抗震性能足尺构件试验[C]//第17届全国结构工程学术会议论文集.武汉,2008:118-124(Ma Ning,Wu Bin,Zhao Junxian,et al.Full scale uniaxial tests on earthquake resistant behavior of all-steel buckling-restrained brace[C]//Proceedings of the Seventeenth National Conference on Structural Engineering.Wuhan,2008:118-124(in Chinese))
[14]AISC Seismic provisions for structural steel buildings[S].Chicago,Illinois:American Institute of Steel Construction,2005
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