玄武岩纤维增强珊瑚骨料混凝土的动态劈拉性能试验研究
Experimental study on dynamic splitting tensile properties of basalt fiber reinforced coral aggregate concrete
傅强 1王振华 1薛颖锟 1牛荻涛1
作者信息
- 1. 西安建筑科技大学土木工程学院,陕西西安 710055
- 折叠
摘要
为研究玄武岩纤维增强珊瑚骨料混凝土(BFCAC)的动态劈拉性能,通过20组100个试件的动态劈拉试验,分析了玄武岩纤维对BFCAC动态劈拉性能的影响机理,建立了动态劈拉强度的统计概率模型.结果表明:随着应变率增大,BFCAC的动态劈拉强度和动态耗能均逐渐增大.当玄武岩纤维掺量分别为0、0.1％、0.2％和0.3％时,随着应变率增大,BFCAC的动态强度增长因子变化范围分别为1.51～2.99、1.74～3.26、2.07～3.45、2.31～3.67,动态耗能增大比例变化范围分别为62.13％～139.39％、73.88％～150.99％、66.15％～162.14％、90.01％～168.11％,表明玄武岩纤维提高了 BFCAC 动态劈拉性能的应变率效应;玄武岩纤维降低了 BFCAC的动态劈拉破坏程度,且其滑移阻抗随着应变率增大而增大,提高了 BFCAC的抗冲击性能.建立的动态劈拉强度统计概率模型可有效表征BFCAC动态劈拉强度的统计分布规律.
Abstract
To study the dynamic splitting tensile properties of basalt fiber reinforced coral aggregate concrete(BFCAC),the influence mechanism of basalt fibers on the dynamic splitting tensile properties was analyzed through the dynamic splitting tensile experiment of 100 BFCAC specimens in 20 sets,and the statistical probability model for the dynamic splitting tensile strength was established.The results show that as the strain rate increases,the dynamic splitting tensile strength and dynamic dissipated energy gradually increase.When the content of basalt fibers is 0,0.1％,0.2％,and 0.3％,respectively,as the strain rate increases,the range of dynamic increase factors is 1.51-2.99,1.74-3.26,2.07-3.45,and 2.31-3.67,respectively,and the range of the increase proportion of dynamic dissipated energy is 62.13％-139.39％,73.88％-150.99％,66.15％-162.14％,and 90.01％-168.11％,respectively,indicating that basalt fibers improve the strain rate effect of dynamic splitting tensile properties of BFCAC.Basalt fibers reduce the degree of dynamic splitting tensile failure of BFCAC,and their slip impedance increases with the increase of strain rate,improving the impact resistance of BFCAC.The established statistical probability model for dynamic splitting tensile strength can effectively characterize the statistical distribution law of dynamic splitting tensile strength of BFCAC.
关键词
珊瑚骨料混凝土/玄武岩纤维/动态劈拉强度/应变率效应/统计概率模型Key words
coral aggregate concrete/basalt fiber/dynamic splitting tensile strength/strain rate effect/statistical probability model引用本文复制引用
基金项目
国家自然科学基金重大项目(51590914)
国家自然科学基金面上项目(52278216)
出版年
2024
国家科技期刊平台
NSTL
万方数据