Experimental study on a self‐centering coupling beam eliminating the beam elongation effect
Experimental study on a self‐centering coupling beam eliminating the beam elongation effect
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DOI：
10.1002/tal.1257
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发表时间：
2016-04
期刊：
影响因子：
--
通讯作者：
K. Deng;P. Pan;Shoujun Wu
中科院分区：
文献类型：
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作者：
K. Deng;P. Pan;Shoujun Wu
传统的自定心连梁在大的剪切变形下表现出梁的伸长效应。梁的伸长效应与刚性板假设相冲突，并可能在连梁和墙壁之间产生有害的压应力。本文提出了一种新型的自定心连梁，旨在消除梁的伸长效应。所提出的自定心连梁由两个连接部分和一个中心摆动部分组成。自定心联梁的主要特点是中心摆动部件和一个连接部件之间存在差距。该间隙为梁伸长效应提供了足够的空间。在连梁转角处设置摩擦阻尼器，以提供耗能能力。进行了三个试件的实验研究。试验结果表明，新型连梁具有良好的自恢复力和耗能能力。根据试验结果，定量讨论了先张钢绞线的预拉力、阻尼器的摩擦力和连梁的差距宽度。有限元分析表明，连梁间隙保护连梁和相邻的剪力墙从梁伸长效应所造成的损害。版权所有© 2015约翰威利父子有限公司.
Traditional self‐centering coupling beams display a beam elongation effect under large shear deformation. The beam elongation effect conflicts with the rigid slab assumption and may induce harmful compressive stress between the coupling beam and the walls. This paper proposes a novel self‐centering coupling beam, aimed at eliminating the beam elongation effect. The proposed self‐centering coupling beam consists of two connecting parts and one central rocking part. The main feature of the self‐centering coupling beam is the gap between the central rocking part and the one connecting part. This gap provides sufficient space for the beam elongation effect. Friction dampers are installed at the corners of the coupling beam to provide energy dissipation capacity. An experimental study, including three specimens, was carried out. The test results demonstrate the satisfactory self‐centering and energy dissipation capacities of the novel coupling beam. Based on these test results, we quantitatively discuss the pretension force in the pretensioning strands, the friction force of the damper and the gap width in the coupling beam. A finite element analysis is performed, showing that the coupling beam gap protects the coupling beam and adjacent shear wall from damage caused by the beam elongation effect. Copyright © 2015 John Wiley & Sons, Ltd.