就鋼骨鋼筋混凝土(SRC)梁之設計而言，除須有效推求其承載強度外，變形之估算亦為重要之設計資訊，本研究藉試驗資訊並考量SRC梁受彎矩時之複合效應，推導合理之SRC彎矩-曲率分析模式，並進一步利用斷面應變及鋼骨與混凝土間的握裹力模式推求SRC梁的力量-位移關係，上述分析模式經與實驗結果比較，皆具甚高之吻合性。 另為獲得SRC梁在反覆載重下之行為，以評估其耐震性能，本研究中亦以衰減參數為基準，推導出SRC斷面彎矩-曲率遲滯模式，此遲滯模式係利用單向載重下之彎矩-曲率關係及修正之樞鈕模式以有效模擬SRC梁撓曲勁度及強度的衰減，本研究中亦考慮反覆載重下之包氏效應，進一步利用SRC梁的遲滯模式進行力量-位移分析，分析所得結果與SRC梁反覆載重實驗結果比較，具有相當的精度。最後，本研究利用SRC梁於反覆載重下之結構反應，推求其等效勁度及等效阻尼與位移韌性之經驗公式，以供耐震設計之參考。 Effective designs of steel reinforced concrete beams require adequate estimations of member strength as well as associated deformation. This study focuses on the rational derivations for the analytical model of the moment-curvature relationship. Composite mechanism between steel and reinforced concrete was incorporated in the analytical model to acquire the load deformation relationship. The results from the flexural load tests are used to validate the accuracy of the proposed model. Comparisons between the experimental information and the analytical results demonstrate close moment-curvature relevance, which justifies the applicability of the proposed method. A hysteretic moment-curvature relationship to simulate the behavior of steel reinforced concrete beams under cyclic loading is further investigated in this study. This model adopts the load-deformation relationship acquired from the monotonic loading tests and incorporates the modified pivot behavior to reflect the characteristics on the deteriorations of stiffness and strength when members are subjected to cyclic loading. Influence of Bauschinger effects is included in the hysteretic model to establish the cyclic load-deformation relationship. Finally, a series of empirical expressions on the equivalent stiffness, damping and ductility are proposed for design references.
