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| Effect of End Friction Confinement on the Uniaxial Dynamic Compressive Strength of Concrete |
| Jin Liu, Han Ya-qiang, Ding Zi-xing, Du Xiu-li |
| Key Laboratory of Urban Security and Disaster Engineering, Beijing University of Technology, Beijing 100124 |
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Abstract Macro mechanical behavior of concrete is closely related to its micro-/meso-scale structure. Considering the influence of heterogeneity of interior structure, a meso-scale mechanical model was established to study the effects of end friction confinement, in which the concrete was assumed to be composed of aggregate particles, mortar matrix and the interfacial transition zones between the former two phases. Taking into account the difference of end friction confinement, the uniaxial dynamic compressive mechanical behavior of concrete subjected to different medium and low strain rates was simulated. Furthermore, the influence mechanism of end friction confinement on the uniaxial dynamic compressive mechanical properties especially the compressive strength of concrete was examined. The simulation results indicate that: 1) with the increase of end friction coefficient, the uniaxial compressive strength of concrete increases first and then becomes flat, under a same loading velocity; 2) the end friction confinement changes the local stress state and damage distribution of concrete, and it contributes to the increase in compressive strength of concrete obviously; and 3) the friction contribution factor presents a descending tendency with increasing the strain rate, and decreases obviously when the end friction coefficient increases.
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Received: 12 May 2015
Published: 25 May 2016
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[1] Perry SH, Prichard SJ. Sleeved concrete cylinders subjected to hard impact [J]. In: 3rd Asia-Pacific Conference on Shock & Impact Loads on Structures, Singapore, 1999, 359-371.
[2] Cao JY, Chung DDL. Effect of strain rate on cement mortar under compression, studied by electrical resistivity measurement [J]. Cement and Concrete Research, 2002, 32(5): 817-819.
[3] Grote DL, Park SW, Zhou M. Dynamic behavior of concrete at high strain-rates and pressures: I. Experimental characterization [J]. International Journal of Impact Engineering, 2001, 25(9): 869-886.
[4] Li QM, Meng H. About the dynamic strength enhancement of concrete-like materials in a split Hopkinson pressure bar test [J]. International Journal of Solids and Structures, 2003, 40(2): 343-360.
[5] Hao Y, Hao H, Li ZX. Influence of end friction confinement on impact tests of concrete material at high strain rate. International Journal of Impact Engineering, 2013, 60: 82-106.
[6] Mu ZC, Dancygier AN, Zhang W. Revisiting the dynamic compressive behavior of concrete-like materials [J]. International Journal of Impact Engineering, 2012, 49(1):91-102.
[7] Li QM, Lu YB, Meng H. Further investigation on the dynamic compressive strength enhancement of concrete-like materials based on split Hopkinson bar tests. Part II: Numerical simulations [J]. International Journal of Impact Engineering, 2009, 36(12): 1335-1345.
[8] 徐勇华, 浣石, 陶为俊, 等. 考虑端部摩擦约束的混凝土SHPB试验细观数值模拟 [J]. 混凝土, 2015(2): 39-42. Xu YH, Huan S, Tao WJ, et al. Meso-level numerical simulation of SHPB tests with end friction confinement [J]. Concrete, 2015(2): 39-42.
[9] 马怀发, 陈厚群, 黎保琨. 混凝土试件细观结构的数值模拟 [J]. 水利学报, 2004, 35(10): 27-35. Ma HF, Chen HQ, Li BK. Meso-structure numerical simulation of concrete specimens [J]. Journal of hydraulic engineering, 2004, 35(10): 27-35.
[10] Zhou X Q, Hao H. Modeling of compressive behavior of concrete-like materials at high strain rate [J]. International Journal of Solids and Structures, 2008, 45(17): 4648-4661.
[11] 杜修力, 金浏. 混凝土材料宏观力学特性分析的细观单元等效化模型 [J]. 计算力学学报, 2012, 29(5): 654 - 661. Du XL, Jin L. Meso-element equivalent model for macro-scopic mechanical properties analysis of concrete materials [J]. Chinese Journal of Computational Mechanics, 2012, 29(5): 654-661.
[12] 杜修力, 金浏. 界面过渡区对混凝土动态力学行为影响分析 [J]. 地震工程与工程振动, 2015, 35(1): 11-19. Du XL, Jin L. Effect of the interfacial transition zone on the dynamic macroscopic mechanical behavior of concrete [J]. Earthquake engineering and engineering dynamics, 2015, 35(1): 11-19.
[13] 杜修力, 韩亚强, 金浏, 等. 骨料空间分布对混凝土压缩强度及软化曲线影响统计分析 [J]. 水利学报, 2015, 46(6):26-34. Du XL, Han YQ, Jin L, et al. Statistical investigation on effects of aggregate distribution on concrete compressive strength and the descending part of stress-strain curve [J]. Journal of hydraulic engineering, 2015, 46(6):26-34.
[14] Zhou XQ, Hao H. Mesoscale modeling of concrete tensile failure mechanism at high strain rates [J]. Computers and Structures, 2008, 86(21/22): 2013-2026.
[15] Snozzi L, Caballero A, Molinari JF. Influence of the meso-structure in dynamic fracture simulation of concrete under tensile loading [J]. Cement and Concrete Research, 2011, 41(11): 1130-1142.
[16] 金浏, 杜修力. 加载速率及其突变对混凝土压缩破坏影响的数值研究 [J]. 振动与冲击, 2014, 33(19): 187- 193. Jin L, Du XL. Effects of loading rate and its sudden change on concrete compressive failure [J]. Journal of vibration and shock, 2014, 33(19): 187-193.
[17] Lubliner J, Oliver J, Oller S, et al. A plastic-damage model for concrete [J]. International Journal of Solids and Structures, 1989, 25(3): 299-326.
[18] Lee J, Fenves GL. Plastic-damage model for cyclic loading of concrete structures [J]. ASCE Journal of Engineering Mechanics, 1998, 124(8): 892-900.
[19] Du XL, Jin L, Ma GW. Numerical simulation of dynamic tensile failure of concrete at meso-scale [J]. International Journal of Impact Engineering, 2014, 66(1): 5-17.
[20] Malvar LJ, Ross CA. Review of strain rate effects for concrete in tension [J]. ACI Materials Journal, 1998, 95(6): 735-739.
[21] Du XL, Jin L, Zhang RB. Modeling the cracking of cover concrete due to non-uniform corrosion of reinforcement [J]. Corrosion Science, 2014, 89: 189-202.
[22] Dilger WH, Koch R, Kowalczyk R. Ductility of plain and confined concrete under different strain rates [J]. American Concrete Institute Special Publication, 1984, 81(1): 73-81.
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