鋼筋混凝土梁受震超額強度因子之研究

THE OVERSTRENGTH FACTOR OF REINFORCED CONCRETE BEAMS FOR SEISMIC DESIGN

10.6652/JoCICHE.202109_33(5).0007

王勇智(Yung-Chih Wang)；莊嬿齡(Yan-Ling Zhuang)

鋼筋混凝土梁 ； 耐震設計 ； 塑性鉸區彎矩 ； 超額強度因子 ； 層間位移比 ； seismic design ； RC beam ； plastic moment ； overstrength factor ； drift ratio

中國土木水利工程學刊

33卷5期（2021 / 09 / 01）

399 - 407

繁體中文

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與SD690分別代表普通強度與高強度鋼筋混凝土之RC梁。利用學者Brooke（2011）統計方法，歸納鋼筋之材料超額強度因子（α_(mat)）與應變硬化超額強度因子（α_(har)）。再者，比較普通與高強度RC梁在相同之層間變位角發生時之差異。根據統計結果顯示，α_(mat)及α_(har)與不同鋼筋級數（SD420與SD690）並無明顯差異，且α_(har)與層間位移比有明顯線性正相關趨勢。另外，若將主筋SD420、SD690之RC梁資料合併探討，則α_(mat)之95%信心水準上限值為1.11；若取DR=3.5%時，α_(har)之95%信心水準上限值為1.12，可得α_(o,DR=3.5%)=1.25，此值與ACI 318-19中之建議值相同。

The purpose of this project is to find out the relationship between overstrength factor (α_o) for different types of reinforcement and the magnitude of seismic intensity which represented by drift ratio. Furthermore, check whether different types of reinforcement have the same strain hardening overstrength factor (α_(har)) when the same drift ratio (DR) occurs. This project collect the data tested from RC beams subjected to cyclic loading. Those beams having the longitudinal reinforcement of SD420 and SD690 represent as normal strength and high strength RC beams, respectively. The study adopted the Brooke's (2011) method to calculate α_(mat) and α_(har) of the steel bar for the normal strength and high-strength RC beams. The findings of this project have led to the conclusion that both α_(har) and α_(mat) have no significant difference between the steel grade of SD420 and SD690. However, α_(har) increases linearly as the drift ratio (DR) rises. In addition, if combine the data of all RC beams neglecting the longitudinal reinforcement grades (SD420 and SD690), the upper limit of the 95% confidence level of α_(mat) is 1.11; if DR = 3.5%, the upper limit of the 95% confidence level of α_(har, DR = 3.5%) is 1.12, which can be obtained α_(har, DR = 3.5%) = 1.25, this value is the same as the recommended value in ACI 318-19.

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