超高性能混凝土单轴受压本构关系  

Constitutive relationship of ultrahigh performance concrete under uni-axial compression

作　　者：郭晓宇[1] 亢景付[1,2] 朱劲松[1,2] Guo Xiaoyu Kang Jingfu Zhu Jinsong(School of Civil Engineering, Tianjin University, Tianjin 300072, China Key Laboratory of Coast Civil Structure Safety of Ministry of Education, Tianjin University, Tianjin 300072, China)

机构地区：[1]天津大学建筑工程学院,天津300072 [2]天津大学滨海土木工程结构与安全教育部重点实验室,天津300072

出　　处：《东南大学学报（自然科学版）》2017年第2期369-376,共8页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51578370);天津市科技支撑计划重点资助项目(16YFZCSF00460)

摘　　要：为研究超高性能混凝土的单轴受压本构关系,分析比较了不同文献提出的超高性能混凝土单轴受压本构方程的异同,建议了统一的超高性能混凝土单轴受压本构方程形式.基于超高性能混凝土单轴受压试验数据,拟合得到计算峰值压应变和弹性模量的经验公式,并提出了超高性能混凝土单轴受压应力-应变曲线上升段参数的计算公式.结果表明:采用《混凝土结构设计规范》(GB 50010—2010)中提供的本构方程形式计算超高性能混凝土的单轴受压应力-应变关系是可行的;轴心抗压强度在80~150 MPa范围内,当轴心抗压强度相同时,圆柱体试件对应的峰值压应变较棱柱体高5.0×10^(-4)~7.5×10^(-4),且轴心抗压强度越高两者差异越大;所提的峰值压应变、弹性模量计算公式和应力-应变曲线上升段参数计算公式具有较高的准确性和可靠性,可用于超高性能混凝土结构的工程设计.To investigate the constitutive relationship of ultrahigh performance concrete（ UHPC） under uni-axial compression,the similarity and the difference of different constitutive equations of UHPC proposed by available literatures are analyzed and compared. The unified constitutive equation of UHPC under uni-axial compression is suggested. The empirical formulas for calculating the peak compressive strain and the elasticity modulus are obtained by fitting the experimental data of UHPC under uni-axial compression. Finally,the calculation formula for the parameters of the stress-strain curve in the ascending phase of UHPC under uni-axial compression is proposed. The research results showthat the constitutive equation provided by the Code for Design of Concrete Structures（ GB50010—2010） can be used to calculate the stress-strain relationship of UHPC. When the axial compressive strength is 80 to 150 MPa,the peak compressive strains of the cylinder specimens are 5. 0 ×10^-4to 7. 5 × 10^-4larger than those of the prism specimens with the same axial compressive strengths.The higher the axial compressive strength is,the larger the difference of the peak compressive strains between the cylinder and the prism specimens. The proposed empirical formulas for the peak compressive strain,the elasticity modulus and the parameter of stress-strain curve in the ascending phase of UHPC have high accuracy and reliability,and can be used for engineering design of UHPC structures.

关 键 词：超高性能混凝土 单轴受压 本构方程 峰值应变 弹性模量 应力-应变曲线上升段参数 

分 类 号：TU528[建筑科学—建筑技术科学]