超高性能混凝土单轴受压本构关系

发布时间：2018-01-24 23:37

本文关键词： 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　出处：《东南大学学报(自然科学版)》2017年02期 　论文类型：期刊论文

【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.
[Abstract]:In order to study the uniaxial compression constitutive relation of UHPC, the similarities and differences of uniaxial compressive constitutive equations of UHPC proposed by different literatures are analyzed and compared. Based on the uniaxial compression test data of UHPC, the empirical formula for calculating the peak compressive strain and elastic modulus of UHPC under uniaxial compression is proposed. The formula for calculating the rising section parameters of uniaxial compressive stress-strain curve of ultra-high performance concrete (UHPC) is presented. The results show that the concrete structure design code is adopted in this paper (GB50010-2010). It is feasible to calculate the uniaxial stress-strain relationship of UHPC by using the constitutive equation provided in this paper. The axial compressive strength is in the range of 80 ~ 150 MPa, when the axial compressive strength is the same. The peak compressive strain of the cylindrical specimen is 5.0 脳 10 ~ (-4) ~ (-4) higher than that of the prism, and the higher the axial compressive strength is, the greater the difference is. The formulas for calculating the peak compressive strain, elastic modulus and the rising section parameters of the stress-strain curve are of high accuracy and reliability, and can be used in the engineering design of ultra-high performance concrete structures.
【作者单位】：天津大学建筑工程学院;天津大学滨海土木工程结构与安全教育部重点实验室;
【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)
【分类号】：TU528
【正文快照】： 超高性能混凝土(ultrahigh performance con-crete,UHPC)是一种集超高强度、超高韧性、高耐久性、抗高温、抗冲击等多重优势于一体的新型水泥基复合材料,正逐步应用于高层建筑、大跨桥梁等工程建设领域.活性粉末混凝土(reactive powder con-crete,RPC)是国内外应用最广的一种

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