Experimental Study on Seismic Behavior of UHPC Columns with Different Stirrup Ratios and Steel Fiber Contents

被引：0
|
作者：
Hu R. [1 ]
Fang Z. [1 ,2 ]
Xu B.-D. [1 ]
机构：
[1] College of Civil Engineering, Hunan University, Changsha
[2] Hunan Provincial Key Laboratory for Wind and Bridge Engineering, Hunan University, Changsha
来源：
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | 2021年 / 34卷 / 08期
基金：
中国国家自然科学基金;
关键词：
Bridge engineering; Quasi-static test; Seismic performance; Steel fiber; Stirrup; UHPC column;
D O I：
10.19721/j.cnki.1001-7372.2021.08.006
中图分类号：
学科分类号：
摘要：
To elucidate the influence of the stirrup ratio and steel fiber content on the seismic behavior of ultra-high-performance concrete (UHPC) columns, five full-scale UHPC columns with different stirrup ratios (0%, 0.25%, and 0.5%), and steel fiber volume ratios (0%, 1%, and 2%) were tested, and the effects of the stirrup and steel fiber volume ratios on the energy dissipation capacity, self-centering capacity, strength degradation capacity, stiffness degradation capacity, and moment-curvature relationship of the UHPC columns were analyzed. Based on the analysis of structural performance, stirrup strain, and equivalent lateral binding force, a formula for the equivalence between the steel fiber volume ratio and stirrup ratio was proposed. The results indicate that: (1) The influences of the stirrup ratios on the failure mode of the UHPC columns were limited; however, they have certain effects on the ductility, energy dissipation, and self-centering capacity of the UHPC columns. When the stirrup ratio increased from 0% to 2%, the ductility factor, energy dissipation capacity, and self-centering capacity of the UHPC column increased by 15%, 55%, and 32%, respectively. (2) The influence of the steel fiber volume ratio on the failure mode of the UHPC columns was significant. With an increase in the steel fiber volume ratio, the crushing and spalling of the concrete was mitigated, thereby delaying the buckling of the compressive bars, and improving the ductility of the columns. When the steel fiber volume ratio increased from 0% to 2%, the ductility factor, energy dissipation, and self-centering capacity of the UHPC columns increased by 45%, 142%, and 42%, respectively. (3) In the case of compressive members with normal section failure, using steel fibers to replace certain stirrups is feasible. For the tested UHPC columns, steel fibers with a volume ratio of 2% can be equivalent to a stirrup ratio of 0.51%. © 2021, Editorial Department of China Journal of Highway and Transport. All right reserved.
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页码：65 / 77
页数：12
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