建筑结构学报2024，Vol.45Issue(8)：108-117,10.DOI:10.14006/j.jzjgxb.2023.0613
超高性能混凝土牛腿受剪性能试验与承载力模型研究
Experimental and theoretical model study on shear performance of ultra-high performance concrete corbels
摘要
Abstract
Through static tests on 12 ultra-high performance concrete(UHPC)corbels,this study investigates the influence of key parameters,such as shear span-to-depth ratio,steel fiber volume ratio,and stirrup reinforcement ratio,on the shear behavior of corbels.The results indicate that,compared to high performance concrete corbels without steel fibers,UHPC corbels exhibit a significant increase in cracking load,accompanied by a transition in failure mode from shear failure to flexural failure.Reducing the shear span-to-depth ratio and increasing the stirrup reinforcement ratio enhance the shear carrying capacity of the corbels.Collected experimental data of UHPC corbels were used to evaluate the applicability of shear capacity calculation formulas for corbels in the specifications GB 50010-2010'Code for design of concrete structures'and JGJ/T 465-2019'Standard for design of steel fiber reinforced concrete structures',as well as the theoretical models.It is observed that the existing models tend to be conservative,resulting in underestimated predictions of UHPC corbel capacity.Based on this assessment,an improved strut-and-tie model suitable for predicting the shear capacity of UHPC corbels was proposed.The model's average ratio of computed results to the experimental results collected in this study is 1.15,with a coefficient of variation of 0.07.The improved model demonstrates better accuracy and consistency compared to existing computational models,serving as a reference for UHPC corbel design.关键词
超高性能混凝土/牛腿/静载试验/拉压杆模型/受剪性能Key words
ultra-high performance concrete(UHPC)/corbel/static test/strut-and-tie model/shear performance分类
建筑与水利引用本文复制引用
黄远,夏文琳,洪志诚..超高性能混凝土牛腿受剪性能试验与承载力模型研究[J].建筑结构学报,2024,45(8):108-117,10.基金项目
国家自然科学基金项目(51890901),湖南创新型省份建设专项(2020RC5005),湖南省自然科学基金项目(2020JJ2003). （51890901）
