{"title":"Experimental investigation on seismic behavior of eccentric RC beams with different reinforcement configurations","authors":"Tai-Kuang Lee, Cheng-Cheng Chen, Guo-Luen Huang","doi":"10.1680/jmacr.23.00104","DOIUrl":null,"url":null,"abstract":"In reinforced concrete buildings, the seismic behavior of RC beams with flush outside faces of beams and columns has not been verified by experiments. In this study, four large reinforced concrete beam specimens are fabricated, and the experimental verification is carried out. The research results show that: (1) All the specimens (including three beam specimens with flush outside faces of beams and columns can have ultimate drift angles of up to 4% rad; (2) The lateral strength and seismic behavior of the specimen with concrete cover of 85 mm are no less than those of the benchmark specimen, so concrete cover thickness between 85 mm and 40 mm for RC beams should be acceptable; (3) The seismic behavior of the two specimens with the lateral U-shaped auxiliary transverse reinforcement and concrete cover of 85 mm is better than that of the benchmark specimen, but the crack width of the latter specimen is wider and the spallling degree of concrete cover is more serious. It is recommended to adopt the lateral U-shaped auxiliary transverse reinforcement whose two legs extend beyond half the width of the hoop with two auxiliary longitudinal reinforcements and the same spacing as the hoop in practice.","PeriodicalId":18113,"journal":{"name":"Magazine of Concrete Research","volume":null,"pages":null},"PeriodicalIF":1.8000,"publicationDate":"2024-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Magazine of Concrete Research","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1680/jmacr.23.00104","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
In reinforced concrete buildings, the seismic behavior of RC beams with flush outside faces of beams and columns has not been verified by experiments. In this study, four large reinforced concrete beam specimens are fabricated, and the experimental verification is carried out. The research results show that: (1) All the specimens (including three beam specimens with flush outside faces of beams and columns can have ultimate drift angles of up to 4% rad; (2) The lateral strength and seismic behavior of the specimen with concrete cover of 85 mm are no less than those of the benchmark specimen, so concrete cover thickness between 85 mm and 40 mm for RC beams should be acceptable; (3) The seismic behavior of the two specimens with the lateral U-shaped auxiliary transverse reinforcement and concrete cover of 85 mm is better than that of the benchmark specimen, but the crack width of the latter specimen is wider and the spallling degree of concrete cover is more serious. It is recommended to adopt the lateral U-shaped auxiliary transverse reinforcement whose two legs extend beyond half the width of the hoop with two auxiliary longitudinal reinforcements and the same spacing as the hoop in practice.
在钢筋混凝土建筑中,梁和柱外侧齐平的钢筋混凝土梁的抗震性能尚未得到实验验证。本研究制作了四个大型钢筋混凝土梁试件,并进行了实验验证。研究结果表明(1) 所有试件(包括三个梁柱外表面齐平的梁试件)的极限漂移角可达 4% rad;(2) 混凝土覆盖层厚度为 85 mm 的试件的侧向强度和抗震性能不低于基准试件,因此混凝土覆盖层厚度在 85 mm 至 40 mm 之间的钢筋混凝土梁是可以接受的;(3)采用横向 U 型辅助钢筋且混凝土保护层厚度为 85 mm 的两个试件的抗震性能优于基准试件,但后者的裂缝宽度更大,混凝土保护层的剥落程度更严重。建议在实践中采用两脚超过箍筋宽度一半的横向 U 型辅助横向钢筋,并配以两根辅助纵向钢筋,间距与箍筋相同。
期刊介绍:
For concrete and other cementitious derivatives to be developed further, we need to understand the use of alternative hydraulically active materials used in combination with plain Portland Cement, sustainability and durability issues. Both fundamental and best practice issues need to be addressed.
Magazine of Concrete Research covers every aspect of concrete manufacture and behaviour from performance and evaluation of constituent materials to mix design, testing, durability, structural analysis and composite construction.