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Mechanical Characteristics of Ultra High Strength Concrete with Steel Fiber Under Uniaxial Compressive Stress

机译:单轴压缩应力下钢纤维超高强混凝土的力学特性

摘要

?? ???? ???? ?? ????? ???? ????? ?? ?????? ??? ?? ? ???? ?? ??? ?? ?? ??? ??? ????. ?? ?? ?????? ??? ?? ???? ??-??? ??? ??? ????.?? ?? ? ????? ?? ????? ?? ??? ???? ????? ???? ????? ???????? ??? ??? ?????. 80~200 MPa ? ????? ??? ?? ???? ????? ???? ??????, ??? ???? ?? ????? ???? ?? ???? ????? ?? ????? ???? ???? ???? ?? ?? ?????. ?? ???? ???? ????? ??? ??? ?? ?? ??????? ??? ???? ???, ????, ???? ??? ???? ??? ?? ??? ???? ?? ???? ??? ?????. ??, ???? ???? ?? ?? ????? ?? ?? ??? ? ???? ?? ?? ????, ???? ??? ??? ? ?? ??? ???? ?? ??? ?????. Design of fiber reinforced ultra-high strength concrete members should be verified with analytical or experimental methods for safety. Members with compressive strength larger than limitation of current design code usually be designed with analytical verification using stress-strain relation of concrete and reinforcements. For this purpose, mechanical characteristics of steel fiber reinforced ultra-high strength concrete were defined under uniaxial compression. Mix proportions of test specimens were based on reactive powder concrete and straight steel fibers were mixed with different volume fraction. Compressive strength of matrix were distributed from 80 MPa to 200 MPa. Effect of fiber inclusion were investigated : increase of compressive strength of concrete, elastic modulus and strain corresponding to peak stress. For the wide range application of investigation, previously tested test specimens were collected and used for investigation and estimation equation. Based on the investigation and evaluation of previous research results and estimation equation of mechanical characteristics of concrete, regression equations were suggested.
机译:?? ???? ???? ?? ?????? ???? ?????? ?? ?????? ??? ?? ? ???? ?? ??? ?? ?? ??? ??? ????。 ?? ?? ?????? ??? ?? ???? ??-??? ??? ??? ????。?? ?? ? ?????? ?? ?????? ?? ??? ???? ?????? ???? ?????? ????????? ??? ??? ?????? 80〜200兆帕?????? ??? ?? ???? ?????? ???? ??????,??? ???? ?? ?????? ???? ?? ???? ?????? ?? ?????? ???? ???? ???? ?? ?? ?????? ?? ???? ???? ?????? ??? ??? ?? ?? ??????? ??? ???? ???,????,???? ??? ???? ??? ?? ??? ???? ?? ???? ??? ?????? ??,???? ???? ?? ?? ?????? ?? ?? ??? ? ???? ?? ?? ????,???? ??? ??? ? ?? ??? ???? ?? ??? ??????纤维增强超高强度混凝土构件的设计应通过分析或实验方法进行验证,以确保安全。抗压强度大于当前设计规范限制的构件通常使用混凝土和钢筋的应力-应变关系进行分析验证来设计。为此,定义了钢纤维增强超高强度混凝土的单轴压缩力学性能。试样的混合比例基于活性粉末混凝土,并以不同的体积分数混合直钢纤维。基体的抗压强度分布在80 MPa至200 MPa之间。研究了纤维夹杂的影响:增加混凝土的抗压强度,弹性模量和对应于峰值应力的应变。对于广泛的研究应用,以前测试过的试样被收集起来用于研究和估计方程。在对以往研究成果进行调查和评价的基础上,提出了混凝土力学性能的估算方程,提出了回归方程。

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