本研究提出兩種鋼筋混凝土構材於火害後之塑鉸分析模式。根據內政部建築研究所防火實驗中心歷年之梁柱複合構件火害實驗成果，本研究選擇三組試體（NC1、NC2、NC3）進行分析比對。分析流程首先採張雲妃、陳舜田等人所提出之鋼筋、混凝土應力應變與溫度關係，分別輸入於：
1.斷面分析軟體。建立火害後圍束區與無圍束混凝土之複合斷面，以獲得臨界斷面在不同溫度作用下之彎矩-曲率關係，匯出彎矩曲率曲線至有限元素分析軟體SAP2000建立塑性鉸參數。
2.有限元素分析軟體SAP2000內建之塑鉸選項Fiber Hinge。將構件上塑鉸位置對應之斷面分割成數百個纖維，每個纖維都具有其高溫後之力學性質與該位置所涵蓋之區域面積，彼此之間會自動考慮相互作用。經過整合斷面纖維之行為，可精確地得到彎矩轉角之關係。
依據以上兩種塑鉸模式，搭配斷面等效彈性模數及慣性矩之折減係數修正，最終可適度模擬火害後鋼筋混凝土梁柱構件，受多點集中載重下的力與變形之關係。因此，本研究成果可有效且迅速建立建築物於火害後其結構行為預估與判定。

In this study, two methods of plastic hinges analysis of the post-fire reinforced concrete structures were proposed. According to the post-fire test results of beam-column composite members of the Fire Experiment Center of the Architecture and Building Research Institute, Ministry of the Interior, Taiwan, ROC. This study selected three groups of specimens (NC1, NC2, and NC3) for analysis and comparison. The analysis procedure first adopts the relationship between stress strain and temperature of rebar and concrete proposed by Yun-Fei Chang and Shun-Tien Chen et al. and inputted separately in:
1.Cross-Section Analysis Software. Establishment of composite cross-sections of confined and unconfined concrete after fire damage in order to obtain the moment-curvature relationship between critical cross-sections at different temperatures, and export the moment-curvature relationship to SAP2000, a finite element analysis software, to build plastic hinges.
2.Fiber Hinge, the hinge option in the finite element analysis software SAP2000. The cross-section corresponding to the position of the plastic hinges on the member is divided into hundreds of fibers, each of which has its own high-temperature mechanical properties and the area covered by the position, and the interaction between them is automatically considered.
Based on the above two methods, with the cross-sectional equivalent modulus of elasticity and the reduction coefficient of inertial moments, the relationship between force and deformation of the post-fire reinforced concrete beam-column structure under multiple points of concentrated load can be simulated appropriately.

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