明架天花板系統之破壞一直以來都是地震中最常面臨的震害問題之一，其中較令人畏懼的情況即是發生大面積天花板崩落，不僅可能會造成人員受傷甚至會影響建築空間震後之使用機能。多年來國內外眾多研究團隊為了提升明架天花板之耐震性能陸續進行過許多相關實驗及研究，迄今亦成功發展出一套耐震工法並已實際應用於天花板案場中；然則近期卻有研究發現耐震型天花板系統雖能有效抵抗水平向地震力，但在垂直向地震力作用下仍有損壞之疑慮。有鑑於此，本研究透過振動台實驗測試垂直向地震對於明架天花板系統之影響，並針對天花板破壞模式及垂直向振動特性做進一步分析。
此外，根據振動傳遞之路徑可知天花板系統之振動反應必然會與建築物振動行為密切相關，不論是發生於建築樓層之振動規模或是建築物頻率特性都會直接對天花板系統造成顯著的影響。因此本文並非僅侷限於探討明架天花板之耐震能力，同時也利用實際建築物強震紀錄資料分析建築物在垂直方向上之振動特性。本研究內容主要可分為兩大部分，第一部分為探討建築物在垂直方向上之振動特性，利用中央氣象局之強震監測系統蒐集建築物實際地震紀錄資料，針對台灣地區強地動特性分析建築物之樓層振動反應以及頻率特性；第二部分則是研究垂直向地震對於明架天花板系統之影響，透過振動台試驗實際測試目前國內天花板系統之耐震性能。本研究不僅將天花板破壞情形作綜合性整理，同時亦特別針對天花板耐震工法中之斜撐組做進一步研究，分析斜撐組在地震中之實際效用。除此之外，為能瞭解天花板系統之內力分布狀況，本研究利用SAP2000結構分析軟體建置明架天花板電腦模型，過程中不僅僅檢核電腦模型之模態特性，更以振動台之輸入紀錄進行動力歷時分析比對電腦模型輸出反應與實驗量測值，藉以確認電腦模型之合理性。完成後之天花板電腦模型可用於模擬各式不同條件下明架天花板系統之地震動態反應。
最終，本文結合兩部分研究成果提出明架天花板耐震檢核之建議公式，適用對象必須是耐震型天花板系統。此公式目的在於避免天花板發生崩塌情形，地震中若能控制天花板不崩落即可確保人員生命安全，且不致影響震後建築物之空間機能。使用者於現場施工前可依據天花板案場所在工址及樓高等條件預先評估天花板是否有崩塌之可能性，若有疑慮則可重新調整設計從而提升明架天花板系統之耐震品質。

This study presents the vertical motion effects on buildings and interior suspended ceilings, and the main contents of it can be divided into two parts. In the first part, real earthquake records of buildings around Taiwan were used to find out the characteristics of the vertical floor acceleration amplification and the vertical natural frequencies of buildings. The results show that the vertical amplification factors of top floor for high-rise buildings and low-rise buildings are 1.81 and 2.64 respectively, and the taller the building is, the lower the natural frequency of the building will be.
Full scale shaking table experiments of suspended ceiling systems were conducted in the second part. Some ceiling specimens were subjected to unidirectional ground motions while the others were subjected to a horizontal and a vertical ground motions acting together. The results demonstrate that there is almost no damage to the ceiling system in response to unidirectional ground motions. However, some significant failure patterns were observed when the vertical ground motions were added to the tests. The other observations reveal that the use of the lateral bracing assembly including compression post may not improve the seismic performance of the ceiling system. The unbraced ceiling systems performed well just as the braced ceiling systems when excited only by horizontal ground motions, and they performed better when subjected to strong vertical excitation.

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