本研究為討論混凝土結構使用美國FEMA(Federal Emergency Management Agency)建議之塑鉸設定方式進行側推分析的優劣性,以國家地震工程研究中心所進行鋼筋混凝土結構物的反覆加載試驗為依據,採用SAP2000軟體進行非線性側推分析(Nonlinear Pushover Analysis)並建立容量曲線。塑性鉸之建立為參照FEMA所提出之模擬方式,求得容量曲線,與試驗之結果做比較並逐步比對破壞模式。研究發現雖然可以模擬出近似的破壞行為,但容量曲線與試驗遲滯迴圈的包絡線相比,仍有明顯差異。因此判斷FEMA建議之方式,在破壞模式之模擬較真實,而桿件的殘餘強度較低導致分析後期強度下降太多,而使得分析之準確性變差。
The major purpose of this research is to study the strong points and weak points of the nonlinear analysis procedure that recommended by FEMA. The analyzed RC structures for comparison are some tested specimens that performed in NCREE. The definition of hinge properties of analyzed structures are according to the regulation of FEMA, the SAP2000 software is adopted for the pushover analysis and to establish the capacity curves. The simulated capacity curves and failure modes of RC structures are compared with those results obtained by cyclic loading tests. This study found that the simulated failure mode can reflect the actual damage conditions by tests, but the simulated capacity curves have significant differences as compared with the test results. The major reason of the differences between simulation and test is that the FEMA’s recommendations have underestimate the residual strength and ductility of the backbone curves of members.