Determination of mechanical parameters for elements in meso-mechanical models of concrete

doi:10.1007/s11709-013-0225-7

Front Struc Civil Eng

2013, Vol. 7

Issue (4) : 391-401 https://doi.org/10.1007/s11709-013-0225-7

RESEARCH ARTICLE

Determination of mechanical parameters for elements in meso-mechanical models of concrete

Xianglin GU(

), Junyu JIA, Zhuolin WANG, Li HONG, Feng LIN

Department of Building Engineering, Tongji University, Shanghai 200092, China

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Abstract

The responses of cement mortar specimens of different dimensions under compression and tension were calculated based on the discrete element method with the modified-rigid-body-spring concrete model, in which the mechanical parameters derived from macro-scale material tests were applied directly to the mortar elements. By comparing the calculated results with those predicted by the Carpinteri and Weibull size effects laws, a series of formulas to convert the macro-scale mechanical parameters of mortar and interface to those at the meso-scale were proposed through a fitting analysis. Based on the proposed formulas, numerical simulation of axial compressive and tensile failure processes of concrete and cement mortar materials, respectively were conducted. The calculated results were a good match with the test results.

Keywords concrete meso-mechanical model discrete element method size effect mechanical parameter

Corresponding Author(s): GU Xianglin,Email:gxl@tongji.edu.cn

Issue Date: 05 December 2013

Cite this article:

Xianglin GU,Junyu JIA,Zhuolin WANG, et al. Determination of mechanical parameters for elements in meso-mechanical models of concrete[J]. Front Struc Civil Eng, 2013, 7(4): 391-401.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-013-0225-7
https://academic.hep.com.cn/fsce/EN/Y2013/V7/I4/391

Fig.1 Generated element mes

Fig.2 Connection of elements

Fig.3 Constitutive model for springs. (a) Normal springs; (b) shear springs

Fig.4 Constitutive model for contact springs. (a) Normal springs; (b) shear springs

Tab.1 Macro- and meso-scale cement mortar parameters

Fig.5 Mechanical parameters of mortar specimens of grade M1. (a) Compressive strength; (b) tensile strength

Fig.6 Comparison of compressive strengths of the test and calculation results

Fig.7 Compressive strength of cement mortar. (a) Common strength mortar; (b) high strength mortar

Fig.8 Relationship between the compressive strength of elements in the meso-scale and that of specimens in the macro-scale

Fig.9 Mechanical parameters of mortar specimens. (a) Elastic modulus; (b) poisson’s ratio

Tab.2 Comparison between simulated results and test results of mortar

Fig.10 Typical axial compression stress-strain curves of cement mortar. (a) M1; (b) M2; (c) M3; (d) M4

Tab.3 Comparison between simulated results and test results of concrete

Fig.11 Typical axial compression stress-strain curves of concrete. (a) C1; (b) C2; (c) C3; (d) C4

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