Investigation into stress wave propagation across interlayers existing in roller compacted concrete (RCC) under impact loadings
Investigation into stress wave propagation across interlayers existing in roller compacted concrete (RCC) under impact loadings
复制标题
研究冲击载荷下碾压混凝土 (RCC) 中应力波跨层传播的情况
DOI：
10.1016/j.conbuildmat.2018.10.186
复制
发表时间：
2018-12-30
影响因子：
7.4
通讯作者：
Wei, Pei-yong
中科院分区：
文献类型：
--
作者：
Wang, Xiao-hua;Zhang, She-rong;Wei, Pei-yong
碾压混凝土中的弱粘结夹层对碾压混凝土层状结构的物理力学性能有重要影响。然而，很少有人关注应力波在冲击载荷下跨夹层的传播。本文利用分离式霍普金森压杆（SHPB）研究了应力波在碾压混凝土中的传播，并通过反射系数和透射系数对应力波的传播进行了表征。结果表明，冲击荷载作用下应力波在碾压混凝土中的传播受夹层的影响，表现出明显的应变率敏感性。此外，提出了等效粘弹性介质模型，分析了应力波在碾压混凝土试件中的传播，证实了应力波的衰减是碾压混凝土非线性变形行为的结果。SHPB试验中应力波理论透射系数与相对波阻抗、波衰减系数和试件长度呈负相关。此外，当碾压混凝土试件暴露于较高的应变率载荷时，波衰减将发生得更少。本文进一步从应力波传播的角度解释了层状碾压混凝土动力特性的机理，指出了夹层对应力波传播的有效阻隔作用。(C)2018爱思唯尔有限公司版权所有。
The weak bonding interlayers in roller compacted concrete (RCC) have significant influence on the physical and mechanical behaviors for its layered structure. However, less attention has been paid to the stress wave propagation across interlayers under impact loadings. In this paper, the split Hopkinson Pressure Bar (SHPB) is used to investigate the stress wave propagation across RCC, characterized by reflection and transmission coefficients. It is found that the stress wave propagation across RCC is influenced by the interlayer and exhibits obvious strain-rate sensitivity under impact loadings. Furthermore, an equivalent viscoelastic medium model is suggested to analyze the stress wave propagation across RCC specimen, which verifies that the wave attenuation lies in the nonlinear deformation behavior of RCC. The theoretical transmission coefficient of stress wave in SHPB test is negatively related to relative wave impedance, wave attenuation coefficient and specimen length. Besides, much less wave attenuation will occur when RCC specimens are exposed to higher strain-rate loadings. This paper further interprets the mechanism for the dynamic behaviors of layered RCC in term of stress wave propagation and indicates the ability of interlayers to obstruct the wave propagation effectively. (C) 2018 Elsevier Ltd. All rights reserved.