本研究使用兩種新型隔振材料，包括PET塑膠高分子材料與竹子，分別作為浮動樓板中之夾板與隔振墊，藉由有限元素套裝軟體ABAQUS進行力學與聲學數值分析，模擬採用此兩種隔振材料之浮動樓板，對衝擊音隔音效能之影響，進而評估其應用於浮動樓板之可能性。首先，建立浮動樓板之力學數值分析模型，探討浮動樓板於建技規則規定之樓板載重作用下，夾板底部之最大水平拉應力及浮動樓板垂直變位是否合宜。然後，建立浮動樓板之聲學數值分析模型，採用CNS 8465-2規範標準，獲得浮動樓板之衝擊音壓位準及隔音值，藉由改變浮動樓板配置，比較其隔音效能之優劣，進而獲得浮動樓板隔振材料之最佳配置方式。
數值分析結果顯示，PET材料勁度較低但抗拉強度較高，作為浮動樓板中之夾板，即使較薄厚度仍可符合規範承載需求，同時，使用PET夾板能提升浮動樓板之隔音效能，此乃因其勁度較低，對中高頻衝擊音之改善較明顯。另外，竹子隔振墊聲學數值分析結果發現，將竹子視為吸音材，則竹子隔振墊所占比例越高，其隔音效能越佳，其中對高頻衝擊音之隔音效能較佳，但對低頻衝擊音仍需藉由彈性減振材料方能加以改善。
關鍵字：樓板衝擊音、浮動樓板、隔振墊、有限元素法

In this study, PET plastic material and bamboo ecological material are employed in a floating floor system as a waterproof slab and a vibration insulator, respectively. Nu-merical models were generated by using finite element software ABAQUS to analyze the mechanical and acoustic properties of the floating floor system. At first, the me-chanical behavior of the floating floor system under a uniform stress and a concentrated load were analyzed according to the specification for architectural design to check if the maximum tensile stress of the slab and the vertical deflection of the floating floor are still allowable. When the mechanical behavior of the floating floor system is adequate, its acoustic properties were further studied to investigate the effects of PET slab and bamboo insulator. The soundproof analyses and evaluations are based on the standard of CNS 8465-2. Numerical results are compared with existing results in literature to evalu-ate the efficiency of the floating floor system including PET slab and bamboo insulator.
Numerical results show that the introduction of PET plastic material reduces the slab thickness, but provides enough load capacity as well as increases soundproof efficiency, especially for high frequency noise. In addition, the bamboo insulator with a high com-pressive strength can reduce the tensile stress of slab in a floating floor system. Mean-while, the more bamboo used as vibration insulator, the better soundproof performance of the floating floor system. However, too many bamboo vibration insulators used in the floating floor system may result in opposite effect on soundproof due to resonance. Alt-hough bamboo vibration insulator can reduce high frequency noise, it should function with some damping material to improve its soundproof for low frequency noise.
Keywords: floating floor system, impact sound, vibration insulator, finite element numerical analysis.

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