Seismic damage thresholds and design methods for two-elevation continuous ceiling systems
Seismic damage thresholds and design methods for two-elevation continuous ceiling systems
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DOI：
10.1016/j.engstruct.2021.113530
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发表时间：
2022-01
影响因子：
5.5
通讯作者：
Liangjie Qi;M. Kurata;Y. Ikeda
中科院分区：
文献类型：
--
作者：
Liangjie Qi;M. Kurata;Y. Ikeda
两个相邻空间或房间的天花板高度因使用计划而不同的两个立面吊顶系统的上升部分经常在地震下受到损坏。在目前的施工实践中，天花板的隆起部分是临时加固的，施工是由分包商在没有工程设计的情况下判断的。因此，本文讨论了地震破坏阈值，并提出了一种设计方法，悬挂两个高度连续的天花板系统，旨在提供一个理论基础的建设两个高度的天花板。首先，在振动台试验中检查天花板系统的脆弱部分，观察到三种主要的损坏模式。脆弱性曲线和与天花板公司的工程师的沟通表明，“两个标高之间的漂移≥1/100”的条件作为判断维修需求的阈值。建立了挑高部分和整体两层挑高结构的分析模型，研究了挑高部分和挑高部分的边缘间隙、挑高部分与挑高部分的质量比、挑高部分与挑高部分的间距以及挑高部分与挑高部分之间的间距以及挑高部分与挑高部分之间的间距以及挑高部分与挑高部分之间的挑高部分与挑高部分之间的间距以及挑高部分与挑高部分之间的挑高部分与挑高部分之间的间距以及挑高部分与挑高部分之间的挑高部分与挑高部分之间的间距等因素对挑高部分挑高结构抗震性能的影响。最后，提出了一种双立面吊顶系统的设计方法，包括设计流程和实例。
The rise-up part of a two-elevation suspended ceiling system, where the ceiling height of two adjacent space or rooms differs due to the usage plan, frequently sustains damage under earthquakes. In current construction practice, the rise-up part in ceilings is temporarily reinforced for construction by the judgment of subcontractors without an engineering design. Thus, this paper addresses seismic damage thresholds and proposes a design method for suspended two-elevation continuous ceiling systems, aiming to provide a rationale for the construction of two-elevation ceilings. First, the vulnerable parts of the ceiling system are examined in a shake table test, where three primary damage patterns are observed. Fragility curves and communications with engineers of a ceiling company indicate a condition of “drift between two elevations ≥1/100” as a threshold for judging a repair need. The analytical model of the rise-up part and the overall two-elevation ceiling are then built to investigate the effects of clearance around ceiling edges, the mass ratio of higher to lower elevation, the distance between TPBBs, and the specification of suspension bars on the seismic behavior of two-elevation ceiling systems. Finally, a design method for two-elevation ceiling systems, including the design flowchart and examples, is proposed.