國內目前積極發展高強度鋼筋混凝土，但國內現行規範缺少針對高強度鋼筋混凝土之設計建議值，故利用數據分析統計得知高強度與普通強度鋼筋混凝土之耐震設計參數差異，是本研究主軸。此外，國內目前對於地震發展大小不同之地區，均採用相同超額強度設計值，缺少針對不同震度與設計值關係。故對於各震度之層間位移比與耐震超額強度因子關係之調查，亦是本研究探討課題之一。 本研究收集、整理及統計歷年來之 RC 梁受反覆載重下之相關數據進行分析與探討，並由梁主筋SD420、SD490與SD690分別代表普通強度與高強度鋼筋混凝土之RC梁。利用Paulay (1992)方式求取RC梁之有效勁度；再者，利用學者 Brooke (2011)統計方法，歸納鋼筋之材料超額強度因子與應變硬化超額強度因子，並探討應變硬化超額強度因子與各震度層間位移比之關係，同時比較普通與高強度RC梁之差異。 研究結果顯示，RC梁構件降伏時之有效慣性矩I_e隨混凝土抗壓強度之增加降低、隨構件之跨深比之增加而增加，且多數規範之建議值有偏高趨勢。而鋼筋應變硬化超額強度因子統計結果顯示，不同鋼筋級數之值無明顯差異，即其值大小與鋼種無關，但在層間變位角於1.5~4%間時，其隨層間位移比之增加有線性增加的趨勢，且ACI 318-19之建議值略低。 ;Taiwan uses the same seismic design values for areas with different earthquake intensity. In addition, Taiwan develops high-strength reinforced concrete in recent years, but the code does not have design values for high-strength. Therefore, the objective of the study is to investigate the difference between the seismic design values of high strength and normal strength RC beams, and to discuss their relationship with drift ratio. This plan collects, organizes and analyzes the data tested from RC beams subjected to cyclic loading. Those beams having the longitudinal reinforcement of SD420, SD490 and SD690 represent as normal strength and high strength RC beams, respectively. The effective initial stiffness (K_{eff}) of the RC beam is obtained by adopting Paulay’s (1992) method. Meanwhile, the study adopted the Brooke’s (2011) method to calculate \alpha_{mat} and \alpha_{har} of the steel bar. The purpose of adopting Brooke’s method is to find the relationship between drift ratio and \alpha_{har}, and their difference between normal strength and high-strength RC beams. The results show that the effective moment of inertia (I_e) of the RC beam decreases with the increase of concrete compressive strength and increases with the increase of span-to-depth ratio, and the recommended value in some codes overestimates the actual value. The statistical results show that there is no significant difference in the value of the overstrength factor of strain hardening, that is, the value of \alpha_{har} is independent of the steel grade, but it has a linear increasing with the increase of the drift ratio. Moreover, the recommended value of \alpha_o in ACI 318-19 is too low.
