Compressive behavior and constitutive model for roller compacted concrete under impact loading: Considering vertical stratification
Compressive behavior and constitutive model for roller compacted concrete under impact loading: Considering vertical stratification
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DOI：
10.1016/j.conbuildmat.2017.06.113
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发表时间：
2017-10
期刊：
影响因子：
--
通讯作者：
huohengyan
中科院分区：
文献类型：
--
作者：
zhangsherong;wangxiaohua;wangchao;songran;huohengyan
本文对碾压混凝土在中应变率下的动态压缩特性和本构模型进行了初步研究。利用分离式霍普金森压杆（SHPB）对碾压混凝土试件进行了单轴动态压缩试验。然后，从破坏形态、应力-应变曲线、抗压强度动态增长因子（DIF）、杨氏模量和峰值应力下的临界应变等方面研究了碾压混凝土材料在中应变率下的动态压缩特性。多项式拟合方法（以lg ε表示）能很好地描述经验应变率效应。碾压混凝土的不同配合比和压实层结构引起的竖向分层对其动力力学性能有影响。针对碾压混凝土材料在统计上的离散性，运用统计理论分析了碾压混凝土动态力学性能的分布规律。通过统计分析，提出了一种新的统计本构模型，其中两个主要参数与应变率和常规力学性能有关。最后，验证了所建立的本构模型对碾压混凝土材料的适用性，提高了对碾压混凝土动态力学性能的估计。
This paper presents fundamental investigation on the dynamic compressive behavior and constitutive model of roller compacted concrete (RCC) at intermediate strain rates. Dynamic uniaxial compression tests of RCC specimens were performed by split Hopkinson pressure bar (SHPB). Then, the dynamic compressive properties of RCC material under intermediate strain rate are investigated in terms of failure pattern, stress-strain curve, dynamic increase factors (DIF) of compressive strength, Young’s modulus and critical strain at peak stress. The polynomial fitting method (in terms of lg ε ̇) was well adapted to describe the empirical strain rate effect. The vertical stratification of RCC caused by different mix proportion and compacted layer structure has influence on its dynamic mechanical behavior. Due to the statistically discreteness of RCC material, the distributions of dynamic mechanical properties were analyzed with statistics theory. A new statistical constitutive model was proposed with statistical analysis, in which the two main parameters were related to strain rate and conventional mechanical properties. Finally, the developed constitutive model is verified and demonstrated to be high applicability to RCC material and improves the estimations of the dynamic mechanical properties of RCC.
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