Seismic resilience of plywood-coupled LVL wall panels
Seismic resilience of plywood-coupled LVL wall panels
复制标题
胶合板耦合 LVL 墙板的抗震能力
DOI：
10.1016/j.engstruct.2017.09.053
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发表时间：
2017
影响因子：
5.5
通讯作者：
A. Buchanan
中科院分区：
文献类型：
--
作者：
Asif Iqbal;M. Fragiacomo;S. Pampanin;A. Buchanan
基于新西兰坎特伯雷大学进行的研究，已提出将层压单板木材（LVL）用于增强多层木结构建筑的抗震性。该系统设计为自对中，无粘结后张，并通过延性连接耗散能量。本文介绍了一个这样的安排与后张LVL墙板耦合胶合板板的实验和数值研究。据观察，能量主要是通过屈服的钉子用于连接胶合板板的墙板，整个组件返回接近其初始位置，同时保持几乎完好无损。在重复的一系列循环载荷下对相同的样本进行了测试，以研究在一次以上的地震事件（例如，大地震后发生重大余震）下的布置性能。通过不同钉间距和布置方式的试验，比较了不同钉间距和布置方式的耗能性能，结果表明，该结构具有良好的抗震性能，构件损伤小，残余变形小。唯一严重受损的部件是胶合板和LVL墙板之间的钉连接。虽然钉子屈服并且刚度降低，但该系统在整个加载状态下表现出稳定的性能而没有任何重大退化。地震后，胶合板可以很容易地拆除，并更换为新的板材，这是相当便宜，易于安装，允许大大减少停机时间。凭借这些额外的好处，该概念值得进一步考虑，作为多层木结构建筑的潜在替代解决方案。
Structural wall panels Laminated veneer lumber (LVL) have been proposed for enhanced seismic resistance of multi-storey timber buildings based on research performed at University of Canterbury, New Zealand. The system is designed to be self-centering with unbonded post-tensioning and dissipate energy through ductile connections. This paper describes the experimental and numerical investigation of one such arrangement with post-tensioned LVL wall panels coupled with plywood sheets. It is observed that energy is dissipated mostly through yielding of the nails used to attach plywood sheets to the wall panels, and whole assembly return close to their initial position while remaining virtually undamaged. The same specimen has been tested under repeated series of cyclic loading to investigate the performance of the arrangement under more than one seismic event (e.g. a major earthquake followed by a significant aftershock). Different nail spacing and arrangements have been tested to compare their energy dissipation characteristics.The results indicate good seismic performance, characterized by negligible damage of the structural members and very small residual deformations. The only component significantly damaged is the nailed connection between the plywood sheet and the LVL wall panels. Although the nails yield and there is a reduction in stiffness, the system exhibits a stable performance without any major degradation throughout the loading regime. After an earthquake, the plywood can be easily removed and replaced with new sheets, which are reasonably cheap and easy to install, allowing for major reduction in downtime. With these additional benefits the concept deserves further considerations as a potentially alternative solution for multi-storey timber buildings.