Pseudodynamic test and numerical simulation of a large direct air‐cooling structure
Pseudodynamic test and numerical simulation of a large direct air‐cooling structure
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DOI：
10.1002/tal.1166
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发表时间：
2015-03
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影响因子：
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通讯作者：
Yazhou Xu;G. Bai;J. Zhu
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文献类型：
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作者：
Yazhou Xu;G. Bai;J. Zhu
本文通过拟动力试验对高烈度地震设防区空冷结构的抗震性能进行了评价。采用1/8的比例系数设计了试验样机，研究了结构在5个峰值地面加速度作用下的响应，并进行了循环试验。记录和展示了试验结果，包括侧向位移、应变和裂纹模式。试验结果表明，直接空冷结构具有良好的抗震性能，位移延性系数大于4。特别需要指出的是，采用钢桁架和斜撑组成的柱间连接，结构的整体性得到了很好的提高，这些钢构件在整个试验过程中主要保持弹性。根据试验结果确定了一阶振型的固有周期和等效粘滞阻尼比，并利用这些参数对有限元模型进行了校核。此外，基于混凝土损伤塑性模型预测的侧向位移与试验结果吻合较好。模型的侧向承载能力和延性均表明，直接空冷结构在高烈度地震作用下满足抗震设计要求。版权所有©2014 John Wiley&Sons，Ltd.
In this study, pseudodynamic test was performed to evaluate the seismic performance of air‐cooling structures built in the high‐intensity earthquake fortification zones. The testing prototype was designed with the scale factor of 1/8, and the structural responses subjected to five peak ground accelerations (PGAs) were investigated followed by a cyclic test. Experimental results, including the lateral displacements, strains and crack patterns, were recorded and presented. The experimental load–displacement hysteretic loops subjected to the cyclic displacement history indicate that the direct air‐cooling structure exhibits a good seismic performance with a displacement ductility factor greater than 4. It is particularly noted that the structural integrity is well enhanced by the inter‐column connections, which are composed by using the steel truss and diagonal braces, and these steel members mainly remain elastic throughout the testing process. The natural period and the equivalent viscous damping ratio of the first‐order mode are also identified on the basis of the test results, which are utilized to calibrate the finite element model. In addition, the predicted lateral displacements based on a damaged plasticity model of concrete agree well with the experimental results. Both the lateral bearing capacity and ductility of the model demonstrate that the direct air‐cooling structure meets the seismic design requirement with respect to the high‐intensity earthquakes. Copyright © 2014 John Wiley & Sons, Ltd.