Seismic evaluation of two‐elevation ceiling system by shake table tests
Seismic evaluation of two‐elevation ceiling system by shake table tests
复制标题
振动台试验对双标高吊顶系统的抗震评价
DOI：
10.1002/eqe.3390
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发表时间：
2020
影响因子：
4.5
通讯作者：
Takaoka Masashi
中科院分区：
文献类型：
--
作者：
Qi Liangjie;Kurata Masahiro;Ikeda Yoshiki;Kunitomo Keiichiro;Takaoka Masashi
过去的地震突出了吊顶的脆弱性，特别是在日本这样的地震多发国家；震后勘察显示，吊顶系统的损坏导致了不可估量的经济损失，并扰乱了伤亡人员的及时救援。现有的研究大多集中在规则方形和水平天花板的抗震性能上，而为了适应风管、非结构管道和电气设备的必然要求，导致了两层天花板系统的出现。本文报道了一个典型的两标高吊顶系统的足尺振动台试验，该系统包括电气设备、管道系统和常用的吊顶结构。试验观测表明，双标高顶板体系在地震激励下表现良好。在摇晃过程中，没有发生面板掉落或整个系统崩溃的情况。本文讨论了在两个天花板立面之间设置临时定位支撑杆(TPBB)和围墙的周边约束对天花板系统的加速度、位移响应和扭转行为的影响。在此基础上，建立了简化的分析模型，并用不同顶板配置的实验响应进行了验证。试验结果表明，一个足够强的TPBB对于减小两个天花板立面之间的相对位移是必不可少的，它保证了天花板系统中两个天花板立面的完整性。总而言之，TPBB在施工阶段结束后应保留在天花板系统中。
Past earthquakes highlighted the vulnerability of the suspended ceiling, especially in earthquake‐prone countries like Japan; the post‐earthquake reconnaissance showed that damage to ceiling systems led to immeasurable economic loss and disturbance of the timely rescue of casualty. The existing studies have mostly focused on the seismic performance of regular square and leveled ceilings, whereas the inevitable requirements to accommodate air ducts, nonstructural piping, and electrical equipment resulted in a two‐elevation ceiling system. This paper reports a series of full‐scale shake table tests on a typical two‐elevation ceiling system, which includes electrical equipment, piping system, and commonly used suspended ceiling structure. Experimental observations showed that the two‐elevation ceiling system performed well under earthquake excitation. No fallen panels or overall system collapse occurred during shaking. This paper discusses the effects of a temporary‐positioning‐bracing bar (TPBB) between two ceiling elevations and peripheral constraints by surrounding wall on the acceleration and displacement response and torsional behavior in the ceiling system. Then, a simplified analytical model was established and verified with the experimental response of different ceiling configurations. The test results indicated that a sufficiently strong TPBB is essential to reduce the relative displacement between two ceiling elevations, and it ensures the integrity of two ceiling elevations in the ceiling system. In conclusion, the TPBB shall remain in the ceiling system after the construction stage.