摘要
为探究高温后钢纤维橡胶自密实混凝土(steel fiber rubber self-compacting concrete,SFRSCC)的动态力学性能,采用直径为80 mm的分离式-霍普金森压杆装置对其进行动态冲击试验,在确定钢纤维最优掺量基础上重点探讨了橡胶掺量对高温后SFRSCC破碎形态、动态抗压强度、冲击韧性以及动态应力增长因子等的影响规律。试验结果表明:与常温下相同,随着橡胶掺量的增加,高温冷却后SFRSCC的动态抗压强度呈逐渐降低的趋势;与常温下相反,高温冷却后SFRSCC抵抗冲击破碎能力、冲击韧性、动态应力增长因子均随着橡胶掺量的增加呈逐渐降低的趋势。对比试验得到的动态应力增长因子与CEB-FIP建议公式计算值的差异,提出了高温后SFRSCC的动态增长因子的修正公式,修正公式的计算值与试验结果和其他文献的试验结果吻合较好,可为进一步分析探讨高温后SFRSCC动力特性提供一定参考。
In order to explore the dynamic mechanical properties of steel fiber rubber self-compacting concrete(SFRSCC)after high temperature,the dynamic impact test of SFRSCC was carried out by using 80 mm diameter split Hopkinson pressure bar.On the basis of determining the optimal content of steel fiber,the influence of rubber content on the fracture morphology,dynamic compressive strength,impact toughness and dynamic stress growth factor of SFRSCC after high temperature was mainly discussed.The test results show that,as the rubber content increases,the dynamic compressive strength of SFRSCC decreases gradually after high temperature cooling.On the contrary,the impact fracture resistance,impact toughness and dynamic increase factor of SFRSCC decreased with the increase of rubber content after high temperature cooling.The difference between the calculated values of the dynamic stress growth factor obtained by the test and the CEB-FIP recommended formula is compared,and the modified formula of the dynamic increase factor of SFRSCC after high temperature is proposed.The calculated values of the modified formula are in good agreement with the experimental results and the experimental results of other literatures,which can provide some reference for further analysis and discussion of the dynamic characteristics of SFRSCC after high temperature.
作者
庄金平
任凯
许可
陈剑星
ZHUANG Jinping;REN Kai;XU Ke;CHEN jianxing(Fujian Provincial Key Laboratory of Advanced Technology and Informatization in Civil Engineering,Fujian University of Technology,Fuzhou 350118,China;School of Civil Engineering,Fujian University of Technology,Fuzhou 350118,China;College of Architecture and Environment,Sichuan University,Chengdu 610065,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2023年第20期19-29,共11页
Journal of Vibration and Shock
基金
国家自然科学基金面上项目(51678152)
福建省自然科学基金面上项目(2021J011063)
福州市科技计划项目(2022-P-010)。
作者简介
第一作者:庄金平,男,工学博士,教授,1978年生。
