鋼筋混凝土梁受震超額強度因子之研究

Translated title of the contribution: The Overstrength Factor of Reinforced Concrete Beams for Seismic Design

Yung Chih Wang, Yan Ling Zhuang

Research output: Contribution to journalArticlepeer-review

Abstract

The purpose of this project is to find out the relationship between overstrength factor (<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 (<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 αmat and αhar 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 αhar and αmat have no significant difference between the steel grade of SD420 and SD690. However, αhar 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 αmat is 1.11; if DR = 3.5%, the upper limit of the 95% confidence level ofαhar, DR = 3.5% is 1.12, which can be obtained αhar, DR = 3.5% = 1.25, this value is the same as the recommended value in ACI 318-19.

Translated title of the contributionThe Overstrength Factor of Reinforced Concrete Beams for Seismic Design
Original languageChinese (Traditional)
Pages (from-to)399-407
Number of pages9
JournalJournal of the Chinese Institute of Civil and Hydraulic Engineering
Volume33
Issue number5
DOIs
StatePublished - Sep 2021

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