現行工程師常用結構分析方法為非線性靜力分析(側推分析)及非線性動力分析兩種；前者分析方法雖能反應RC結構物耐震特性，但只考慮到第一模態，在低矮樓層較為可行。而在中高樓層須考慮到高模態之反應，側推分析方法無法反應高模態及扭轉行為，故中、高樓層一般常用非線性動力分析進行。雖然非線性動力分析有效反應出結構之行為，但因執行非線性動力分析過於耗時，不便於工程師使用。故本文主要探討脊骨模型於非線性動力分析之可行性；在彈性部分脊骨模型與完整模型結果相符，而非線性分析之結果脊骨模型能有效模擬，同時藉由脊骨模型之特性結合側推分析方法，以反應結構物高模態之行為。以脊骨模型取代完整RC結構模型進行非線性動力分析，並以相當精簡的時間完成分析，提供工程師使用於中高樓層之分析檢核與耐震能力評估。

Two kinds of structure analysis method that engineers often used are the nonlinear static analysis (pushover analysis) and the nonlinear dynamic analysis. The first one is usually used to evaluate the seismic performance of reinforced concrete structures, but it only can be considered with the first mode effect. Therefore, it is more suitable for low-rise buildings. It is needed to consider the response of higher mode effects in high-rise buildings, so the structural models of nonlinear dynamic analysis are often used in high-rise buildings because pushover analysis method cannot simulate with higher mode and torsion effects. Although nonlinear dynamic analysis can simulate the structural behavior effectively, it is too time-consuming and inconvenient for engineers to use it. Hence, this study mainly focuses on the feasibility of a spine model, and improves the results of pushover analysis. If whole structure can be simplified by a spine model, the nonlinear dynamic analysis can be finished within less time. It also provides the engineers to evaluate the seismic performance of high-rise buildings.

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