Shaking table tests on seismic response of steel braced frames with column uplift
Shaking table tests on seismic response of steel braced frames with column uplift
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DOI：
10.1002/eqe.603
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发表时间：
2006-11
影响因子：
4.5
通讯作者：
M. Midorikawa;T. Azuhata;T. Ishihara;A. Wada
中科院分区：
文献类型：
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作者：
M. Midorikawa;T. Azuhata;T. Ishihara;A. Wada
以往的研究表明，摇摆振动伴随着上抬运动可能会减少遭受严重地震运动的建筑物的地震破坏。本文报告了利用振动台试验和数值分析来评估和比较柱允许隆起的底板屈服摇摆系统与固定基础系统的地震反应。本研究采用半比例三层1 × 2跨支撑钢框架进行，总高度为5.3 m。在每根立柱的底部安装了因立柱张力而屈服的底板。研究了两种不同厚度的底板。用于测试和分析的地震地面运动是1940年埃尔森特罗NS分量的记录，其时间尺度缩短了1/2。最大输入加速度的比例，以检查在不同的地震烈度的结构反应。与基础固定的框架相比，柱上拔的摇摆框架中的柱脚剪力最多可减少52%。相反，固定框架和摇摆框架的最大屋顶位移大致相同。还应注意，与底板触地相关的立柱上的垂直冲击的影响很小，因为拉力和压缩力的差异主要是由于底板屈服引起的立柱中的自限拉力。版权所有© 2006约翰威利父子有限公司。
Previous studies have suggested that rocking vibration accompanied by uplift motion might reduce the seismic damage to buildings subjected to severe earthquake motions. This paper reports on the use of shaking table tests and numerical analyses to evaluate and compare the seismic response of base‐plate‐yielding rocking systems with columns allowed to uplift with that of fixed‐base systems. The study is performed using half‐scale three‐storey, 1 × 2 bay braced steel frames with a total height of 5.3 m. Base plates that yield due to column tension were installed at the base of each column. Two types of base plates with different thicknesses are investigated. The earthquake ground motion used for the tests and analyses is the record of the 1940 El Centro NS component with the time scale shortened by a factor of 1/√2. The maximum input acceleration is scaled to examine the structural response at various earthquake intensities. The column base shears in the rocking frames with column uplift are reduced by up to 52% as compared to the fixed‐base frames. Conversely, the maximum roof displacements of the fixed and rocking frames are about the same. It is also noted that the effect of the vertical impact on the column associated with touchdown of the base plate is small because the difference in tensile and compressive forces is primarily due to the self‐limiting tensile force in the column caused by yielding of the base plate. Copyright © 2006 John Wiley & Sons, Ltd.