不同冲击荷载作用下风积砂混凝土动力学特性及能量耗散规律研究  

Dynamic characteristics and energy dissipation law of Aeolian sand concrete under different impact loads

作　　者：张慧梅[1] 王丹 陈世官 ZHANG Huimei;WANG Dan;CHEN Shiguan(Department of Mechanics,Xi′an University of Science and Technology,Xi′an 710054,China;College of Architecture and Civil Engineering,Xi′an University of Science and Technology,Xi′an 710054,China)

机构地区：[1]西安科技大学理学院,陕西西安710054 [2]西安科技大学建筑与土木工程学院,陕西西安710054

出　　处：《哈尔滨工程大学学报》2025年第2期210-218,共9页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(12172280,12472406);陕西省自然科学基金重点项目(2020JZ-53);陕西省重点研发计划(2024SF-YBXM-626)。

摘　　要：为探讨风积砂混凝土单次及循环冲击荷载作用下动力学特性及能量耗散规律,本文通过分离式霍普金森压杆装置,对风积砂混凝土试件进行动力学试验,探究单次、循环冲击作用下的宏观破坏模式、动力学特性和能量耗散特征。结果表明:单次冲击作用下,随着冲击气压的增大,试件破碎程度越高,块度粒径越小,峰值应力及峰值应变均增大,并表现出明显的应变率相关性,试件强度增大,单位体积吸收能增大,能量吸收率则减小。循环冲击作用下,试件发生破坏所需的冲击次数随冲击气压的增大而减小,恒定气压下,随着冲击次数增加,试件破碎块度由大粒径向中、小粒径过渡,峰值应力正相关,峰值应变负相关,单位体积吸收能及能量吸收率呈总体下降趋势。风积砂影响混凝土抗冲击性能,原因在于其减少孔隙体积及分布,达到消耗冲击能量,减小结构冲击响应的作用。同时,改变了颗粒级配及混凝土密实度,改善了界面过渡区结构,最终达到增强混凝土抗冲击性能的作用。The dynamic impact failure test of Aeolian sand concrete was carried out using the split Hopkinson pressure bar system to investigate the dynamic characteristics and energy dissipation law of Aeolian sand concrete under different impact loads.The macroscopic failure mode,dynamic features,and energy dissipation characteristics under single and cyclic impact were mainly studied.The results show that under a single impact,with the increase in pressure,a higher crushing degree of the specimen indicates a smaller block particle size.The peak stress and strain increase and show evident strain rate correlation.The strength of the specimen increases,as well as the absorption energy per unit volume,whereas the energy absorption rate decreases.Under cyclic impact,the number of impacts required to cause damage to the specimen decreases as the impact pressure increases.At constant pressure,as the number of impacts increases,the degree of fragmentation of the specimen transforms from larger particle sizes to smaller and medium sizes.The peak stress shows a positive correlation with the number of impacts,whereas the peak strain exhibits an inverse relationship.In addition,the energy absorbed per unit volume and the energy absorption rate generally show a downward trend.The influence of Aeolian sand on the impact resistance of concrete can be attributed to its effects on pore volume and distribution,which consume impact energy and weaken the structural impact response.At the same time,the incorporation of Aeolian sand alters particle grading and concrete compactness,improving the structure of the interface transition area.Finally,these changes enhance the impact resistance of the concrete.

关 键 词：风积砂混凝土 分离式霍普金森压杆 循环冲击 破坏模式 应变率 动态增长因子 动力学特性 能量耗散 

分 类 号：TU528[建筑科学—建筑技术科学]