Experimental study of mechanical properties of high-strength reinforced concrete short columns confined by 635 MPa high-strength stirrups under eccentric compression

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Dec.2025, Vol.48 No.12: 1705-1712

DOI: 10.3969/j.issn.1003-5060.2025.12.018

Authors

WANG Jingfeng $ ^{1,2} $, WANG Xiushuai $ ^{1} $, MA Binghui $ ^{3} $, LIU Yong $ ^{1,2} $, SHEN Qihan $ ^{1,2} $

(1. School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China; 2. Anhui Key Laboratory of Civil Engineering Structures and Materials, Hefei 230009, China; 3. Anhui Tongji Construction Group Co., Ltd., Hefei 230022, China)

Abstract and Keywords

Abstract: In order to study the constraints of high-strength stirrups, the match between high-strength steel bars and concrete, and the mechanical properties of high-strength reinforced concrete short columns confined by 635 MPa high-strength stirrups under eccentric compression, the eccentric distance, concrete strength, stirrup strength, and volume stirrup ratio were used as parameters to conduct the eccentric compression tests of 13 high-strength reinforced concrete short columns confined by 635 MPa high-strength stirrups. The failure mode of the specimens and the influence of various parameters on load-strain were analyzed. The results show that the failure mode of the specimens is similar to that of ordinary reinforced concrete short columns. The ultimate load bearing capacity of the specimens increases with the decrease of the eccentric distance and the increase of the concrete strength and the volume stirrup ratio, but the increase of the stirrup strength has little effect on the ultimate load bearing capacity of the member. The 635 MPa high-strength steel bars should be applied with C60 or high-

Keywords: 635 MPa high-strength steel bars; stirrup constraints; eccentric compression test; failure mode; load bearing capacity calculation method

作者信息

王静峰 $ ^{1,2} $，王修帅 $ ^{1} $，马兵辉 $ ^{3} $，刘用 $ ^{1,2} $，沈奇罕 $ ^{1,2} $

（1. 合肥工业大学土木与水利工程学院，安徽合肥 230009；2. 土木工程结构与材料安徽省重点实验室，安徽合肥 230009；3. 安徽同济建设集团有限责任公司，安徽合肥 230022）

摘要和关键词

摘要: 为研究高强箍筋的约束效应、高强钢筋与混凝土匹配性以及635 MPa级高强箍筋约束高强钢筋混凝土短柱的偏压性能,文章以偏心距、混凝土强度、箍筋强度及体积配箍率为参数,开展13根635 MPa级高强箍筋约束高强钢筋混凝土短柱偏压试验,分析试件破坏模式及各参数对荷载-应变的影响规律。研究表明:635 MPa级高强箍筋约束高强钢筋混凝土偏压短柱的破坏模式与普通钢筋混凝土短柱类似;试件极限承载力随着偏心距的减小、混凝土强度及体积配箍率的增加而提高,增大箍筋强度对构件极限承载力影响不大;635 MPa级高强钢筋与C60及以上等级的混凝土匹配性较好;635 MPa级高强箍筋在峰值荷载时均未达到屈服应变,在荷载下降段都会屈服,能够提升受压区混凝土的峰值应变以及试件的延性。结合高强纵筋与混凝土强度匹配性以及高强箍筋对核心区混凝土约束效应,文章提出一种适用于高强箍筋约束高强钢筋混凝土偏压短柱的计算修正方法并验证了其准确性。该研究结果为建立高强钢筋混凝土计算理论提供试验依据,并促进635 MPa级高强度钢筋在工程领域的推广和使用。

关键词: 635 MPa 级高强钢筋；箍筋约束效应；偏压试验；破坏形态；承载力计算方法

Funding

国家自然科学基金资助项目（52108130）；教育部新世纪优秀人才支持计划资助项目（NCET120838）

合肥工业大学学报(自然科学版)

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