邱灿星, 姜天缘, 刘家旺, 杜修力. 基于防屈曲镍钛SMA棒的自复位隅撑钢框架:构件试验和结构行为[J]. 工程力学, 2023, 40(10): 33-46. DOI: 10.6052/j.issn.1000-4750.2022.01.0095
引用本文: 邱灿星, 姜天缘, 刘家旺, 杜修力. 基于防屈曲镍钛SMA棒的自复位隅撑钢框架:构件试验和结构行为[J]. 工程力学, 2023, 40(10): 33-46. DOI: 10.6052/j.issn.1000-4750.2022.01.0095
QIU Can-xing, JIANG Tian-yuan, LIU Jia-wang, DU Xiu-li. SELF-CENTERING KNEE-BRACED STEEL FRAMES WITH BUCKLING-RESTRAINED NITI SMA BARS: COMPONENT TEST AND STRUCTURAL BEHAVIOR[J]. Engineering Mechanics, 2023, 40(10): 33-46. DOI: 10.6052/j.issn.1000-4750.2022.01.0095
Citation: QIU Can-xing, JIANG Tian-yuan, LIU Jia-wang, DU Xiu-li. SELF-CENTERING KNEE-BRACED STEEL FRAMES WITH BUCKLING-RESTRAINED NITI SMA BARS: COMPONENT TEST AND STRUCTURAL BEHAVIOR[J]. Engineering Mechanics, 2023, 40(10): 33-46. DOI: 10.6052/j.issn.1000-4750.2022.01.0095

基于防屈曲镍钛SMA棒的自复位隅撑钢框架:构件试验和结构行为

SELF-CENTERING KNEE-BRACED STEEL FRAMES WITH BUCKLING-RESTRAINED NITI SMA BARS: COMPONENT TEST AND STRUCTURAL BEHAVIOR

  • 摘要: 隅撑一般安装于框架梁柱的节点附近。和中心支撑相比,隅撑具有占用空间少、对建筑外观影响小、安装更为方便和震后更易更换等优点。超弹性镍钛形状记忆合金(SMA)在常温下能够具有“旗帜型”滞回曲线,兼具消能能力和自复位能力,近年来受到地震工程界的广泛关注。该文选取镍钛SMA棒为核心受力构件,利用防屈曲装置提出了基于防屈曲镍钛SMA棒的自复位隅撑(SCKB)。进一步的,以SCKB为关键抗震构件,提出了一种新型的抗震韧性钢结构,即自复位隅撑钢框架(SCKBF)。加工了缩尺比例的SCKB试件,并开展了往复加载试验。试验结果表明,SCKB受拉和受压时均拥有稳定的“旗帜型”滞回行为。为了评估SCKBF的抗震性能,根据底部剪力法设计了楼层数分别为3层和6层的结构,开展了罕遇地震下的弹塑性时程分析。计算结果表明:SCKBF能够满足规范对层间位移转角限值的要求;并且,结构的震后残余层间位移角几乎为零,体现了良好的震后功能可恢复性。该文为进一步的体系试验和抗震设计也起到了有益的铺垫。

     

    Abstract: Knee braces are often installed at locations near the beam-to-column connections in frames. In comparison with concentrical braces, knee braces have advantages of using less space, generating less impact to architecture view and being installed more conveniently. Super-elastic shape memory alloys (SMA) exhibit flag-shape hysteresis at room temperature, which indicates energy-dissipating capacity and self-centering (SC) capability. Accordingly, SMAs gained wide attention among the community of earthquake engineering. Combining NiTi SMA bar with buckling-restrained device, a novel knee brace, i.e., SC knee brace (SCKB) was proposed. Further, a new seismically resilient steel structure was developed , which is named as SCKB frame (SCKBF). And the reduced scale specimen of SCKB was tested. The testing results show that, SCKB has stable flag-shape hysteresis under both tension and compression. To evaluate the seismic performance of SCKBF, two frames with 3 and 6 stories were designed by equivalent base shear method and subjected to a suite of earthquake ground motions. The nonlinear time history analysis indicates that SCKBF can well meet the drift target prescribed by the code. Besides, the structures have minimal residual inter-story drift ratios, implying good seismic resilience. It also sheds light on further experimental work and design method.

     

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