固定式玻璃防煙垂壁自振頻率及耐震性能提升之研究

A Study on Natural Frequency and Seismic Performance Improvement of Glass-Type Static Smoke Barriers

固定式玻璃防煙垂壁是國內大型賣場、百貨公司及交通運輸等大型公共建築所使用的主要防煙區劃構造，隨著空間特性及結構系統跨距，防煙垂壁的規劃配置也有多種方式。依據臺灣和日本震害經驗，固定式玻璃防煙垂壁在大地震後經常有損壞的情形產生，可能在面臨地震後火災的複合災害情境下，造成建築火災煙熱控制系統失效，煙霧迅速蔓延且玻璃碎片掉落一地，影響逃生及救災，甚至導致嚴重傷亡。本研究對不同的固定式玻璃防煙垂壁的配置方式、介面接合方式及側向支撐長度等變因，規劃了7組固定式玻璃防煙垂壁試體安裝於明架天花板系統下方以地震波進行大尺寸面外振動台測試。對不同變因下固定式玻璃防煙垂壁的耐震性能深入了解其特性，並可對不同變因下固定式玻璃防煙垂壁系統識別結果進行分析，也建立理論分析模型對兩端無束制固定式玻璃防煙垂壁進行探討，進一步確認及修正兩端束制及兩端無束制固定式玻璃防煙垂壁長度與自振頻率的估算公式。本研究成果將可作為固定式玻璃防煙垂壁耐震性能設計及耐震提升之參考。

 

Glass-type static smoke barriers(SSB)are the most common component of a Smoke and Heat Control System in Taiwan. In accordance with building types and structural spans, there are many possible layouts to form a smoke containment zone. The SSB usually are damaged in major earthquakes in Taiwan and Japan. The sharp fragments of the glass will obstruct escape route for people and lose the efficacy to prevent the smoke spreading in the fires following earthquake. In order to investigate the variables of the layout, boundary condition and length between support of SSB, 7specimens are subjected to out-of-plane shaking table tests in conjunction with the exposed ceiling system. According to the result of large scale shaking table test, an analytical model is established and verified. The out-of-plane dynamic characteristics of the SSB with two-sided free edge are obtained and the empirical formula to evaluate the natural frequency of the SSB with two-sided fixed edge by length between support are corrected. The conclusion of this study could provide a guideline to conduct the seismic performance design and improvement of glass-type static smoke barriers.