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Seismic evaluation of two-elevation ceiling system by shake table tests

机译：摇架测试对两升高天花板系统的地震评价

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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.
机译：过去的地震突出了悬浮天花板的脆弱性，特别是在日本等地震 - 易发国家;后地震侦察表明，天花板系统的损坏导致了不可估量的经济损失和干扰伤亡的及时救援。现有的研究主要集中在常规方形和平台上的地震性能上，而不可避免的要求，以适应风管，非结构管道和电气设备导致两座高度天花板系统。本文报告了一系列全尺寸摇动台测试在典型的两高度天花板系统上，包括电气设备，管道系统，以及常用的悬挂天花板结构。实验观察结果表明，两升高的天花板系统在地震激励下进行了良好。摇晃期间没有发生倒下的面板或整体系统崩溃。本文讨论了临时定位 - 支撑杆（TPBB）在天花板系统中的加速度和位移响应和扭转行为上的两个天花板高度和周边约束之间的影响。然后，建立了简化的分析模型并通过不同天花板配置的实验响应来确定和验证。测试结果表明，足够强大的TPBB对于减少两个天花板仰角之间的相对位移是必不可少的，并且它确保了天花板系统中的两个天花板高度的完整性。总之，TPBB在施工阶段之后将留在天花板系统中。

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