UHPC弯拉性能及应力裂缝宽度关系  

Relationship Between Bending and Tensile Properties of UHPC and Stress Crack Width

作　　者：熊伟 徐斌 聂立力 XIONG Wei;XU Bin;NIE Lili(Central&Southern China Municipal Engineering Design and Research Institute Co.Ltd.,Wuhan 430010,China)

机构地区：[1]中国市政工程中南设计研究总院有限公司,武汉430010

出　　处：《武汉理工大学学报（交通科学与工程版）》2023年第2期370-373,共4页Journal of Wuhan University of Technology（Transportation Science & Engineering）

摘　　要：通过超高性能混凝土(UHPC)棱柱体的三点弯曲试验,研究了长直型、端勾型和混合型钢纤维在不同纤维掺量下对UHPC弯拉性能的影响.结果表明:在2%~3.5%的掺量范围内,UHPC的极限强度随纤维掺量增加而持续显著增强.纤维类型对极限强度的影响不明显,混合型纤维UHPC的极限强度与长直型的比值介于0.99~1.01,而端勾型与长直型之比为0.94~1.03.倒推分析法UHPC的应力-裂缝宽度关系表明,在同一裂缝宽度下,混合型纤维UHPC表现出的应力水平最低.Through the three-point bending test of ultra-high performance concrete(UHPC)prism,the effects of long straight steel fiber,end hook steel fiber and mixed steel fiber on the bending and tensile properties of UHPC with different fiber content were studied.The results show that in the range of 2%~3.5%,the ultimate strength of UHPC continues to increase significantly with the increase of fiber content.However,the influence of fiber type on ultimate strength is not obvious.The ratio of ultimate strength to long straight type of hybrid fiber UHPC is 0.99~1.01,while the ratio of end hook type to long straight type is 0.94~1.03.The relationship between stress and crack width of UHPC by backward analysis shows that under the same crack width,hybrid fiber UHPC shows the lowest stress level.

关 键 词：UHPC 三点弯曲试验 纤维类型 纤维掺量 初裂强度 极限强度 

分 类 号：U443.32[建筑科学—桥梁与隧道工程]