本研究探討簡化壓縮機–基礎系統中，剛性連桿模型與鋼箱模型之比較反應。為評估不同建模假設對靜態與動態行為預測結果之影響，本研究採用兩種建模方法來模擬壓縮機系統。分析中考慮四個旋轉構件作為不平衡激振來源，包括馬達、牛齒輪、高速端（HS）與低速端（LS）構件。數值分析使用 MIDAS GEN 進行，並依據 ACI 318-19、ACI 351.3R-18 及 ISO/DIS 20816-3 之建議評估結構與振動反應。分析結果顯示，兩種建模方法皆滿足 ACI 318-19 之靜態強度要求，包括抗彎強度、單向剪力、沖切剪力、土壤承載壓力與沉陷評估。動態評估結果亦顯示，兩種模型皆符合振動接受標準，其中機器位置之局部位移反應維持在可接受範圍內，基礎位移非常小，且計算所得之速度反應皆落於 ISO 評估之可接受振動範圍內。整體而言，剛性連桿模型因其理想化剛性連接特性，通常預測出較低的反應振幅；而鋼箱模型則能反映壓縮機–基礎介面處有限的柔性，並在部分案例中產生稍高的反應。儘管兩種模型之間存在些微差異，結果皆確認在本研究所考慮的載重條件下，簡化壓縮機–基礎系統於結構安全性與動態反應方面皆屬可接受。

This study investigates the comparative response of rigid-link and steel box models for a simplified compressor–foundation system. The compressor was represented using two modeling approaches to evaluate the influence of modeling assumptions on the predicted static and dynamic behavior. Four rotating components, including the motor, bull gear, high-speed (HS), and low-speed (LS) components, were considered as sources of unbalance excitation. The analysis was conducted using MIDAS GEN, and the structural and vibration responses were assessed based on ACI 318-19, ACI 351.3R-18, and ISO/DIS 20816-3 recommendations. The results show that both modeling approaches satisfied the preliminary ACI 318-19-based static strength checks, including flexural strength, one-way shear, punching shear, soil bearing pressure, and settlement evaluation. The dynamic assessment also showed that both models satisfied the vibration acceptance criteria, with local displacement responses remaining within the acceptable range, foundation displacement remaining very small, and calculated velocity responses remaining within the acceptable range of the ISO-based vibration severity assessment. The rigid-link model generally produced lower response amplitudes due to its idealized rigid connection, while the steel box model captured limited flexibility at the compressor–foundation interface and produced slightly higher responses in some cases. Although slight differences were observed between the two models, both confirmed that the simplified compressor–foundation system is structurally adequate and dynamically acceptable within the assumptions and limitations of this study.

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