配筋UHPC梁抗弯性能试验与承载力简化计算  

Experimental of flexural performance and simplified calculation of bearing capacity of reinforcement UHPC beams

作　　者：付军[1,2] 闵亦斌 王发洲 商得辰 刘志超 张涛 FU Jun;MIN Yibin;WANG Fazhou;SHANG Dechen;LIU Zhichao;ZHANG Tao(Wuhan University of Technology,Wuhan 430063,China;State Key Laboratory of Silicate Materials for Architectures,Wuhan 430070,China;Huaxin Cement Co.,Ltd.,Wuhan 430070,China;Power China Guiyang Engineering Corporation Limited,Guiyang 550081,China)

机构地区：[1]武汉理工大学,湖北武汉430063 [2]硅酸盐建筑材料国家重点实验室,湖北武汉430070 [3]华新水泥股份有限公司,湖北武汉430070 [4]中国电建贵阳勘测设计研究院有限公司,贵州贵阳550081

出　　处：《混凝土》2023年第11期1-6,共6页Concrete

基　　金：湖北省重大科技专项“超高性能混凝土制备与应用关键技术及工程示范”(2018AAA004)。

摘　　要：通过5根不同配筋率的UHPC梁受弯试验,研究配筋及分布对UHPC梁的荷载-挠度曲线、延性、裂缝情况与破坏形态影响,考虑UHPC受拉区强度讨论设计承载力简化计算模式。结果表明:UHPC梁的极限承载力、刚度随配筋率增大而增大,但配筋也缩短了UHPC梁塑性变形阶段,使延性有所降低;配筋率为3.1%的UHPC梁能有效减少裂缝数目及最大裂缝宽度,同时兼顾承载力和延性指标;配筋率相同(均为2.1%)时,配筋分布均匀的梁体开裂挠度降低20.2%,最大裂缝宽度减少25.0%,平均裂缝宽度减少27.3%。计入UHPC受拉区强度影响后,配筋梁抗弯承载力提升了约18.2%,且计算结果与试验数据吻合度较好,可为配筋UHPC梁抗弯设计提供参考。By the bending test of 5 UHPC beams with different reinforcement ratios,the effect of reinforcement and distribution of UHPC beams was analyzed with the load-deflection curve for the ductility,cracks,and bearing capacity.The results show that the ultimate bearing capacity and stiffness of UHPC beams increase with increasing reinforcement ratio.However,reinforcement shortens the plastic deformation stage of UHPC beams and reduces its ductility.UHPC beams which reinforcement ratio is 3.1%can effectively reduce the number of cracks and the maximum crack width,while taking into account the bearing capacity and ductility indicators.When the reinforcement ratio is the same(2.1%),the crack deflection of the beam with uniform reinforcement distribution decreases by 20.2%,the maximum crack width decreases by 25.0%and the average crack width decreases by 27.3%.The calculation results of the bearing capacity considering the tensile strength of UHPC are in good agreement with the experimental data,which can provide reference for the bending design of UHPC beams reinforced with steel.

关 键 词：超高性能混凝土 配筋影响 抗弯试验 承载力计算分析 

分 类 号：TU528.01[建筑科学—建筑技术科学]