Multiscale diffusion-thermal-mechanical cohesive zone model for concrete

被引:58
作者
Wu, T. [1 ,2 ]
Wriggers, P. [1 ]
机构
[1] Leibniz Univ Hannover, Inst Continuum Mech, D-30167 Hannover, Germany
[2] Tech Univ Carolo Wilhelmina Braunschweig, Inst Appl Mech, D-38106 Braunschweig, Germany
关键词
Multiscale; Concrete; Cohesive zone model; Coupling; THICKNESS INTERFACE ELEMENTS; ANISOTROPIC DAMAGE MODEL; CEMENT-BASED MATERIALS; THERMOMECHANICAL SOLIDS; TRANSITION ZONE; PART I; FRACTURE; SIMULATION; COMPOSITES; INTERPHASE;
D O I
10.1007/s00466-015-1149-y
中图分类号
O1 [数学];
学科分类号
0701 ; 070101 ;
摘要
The present work establishes a reliable model to describe the influence due to the interfacial transition zone (ITZ) between cement paste and aggregates on the mechanical, thermal and diffusion properties of concrete. The mesostructure of concrete consists of aggregates with a random distribution embedded in the cement paste as well as the interface elements with zero-thickness representing the ITZ. In this work, the cohesive zone model (CZM) is used to model the debonding at the ITZ between cement paste and aggregates. Furthermore, a traction-separation law in CZM combined with micromechanically motivated thermal flux-separation relation and diffusion flux-separation relation is developed, thus enabling to describe the temperature jump and humidity jump across the cohesive crack.
引用
收藏
页码:999 / 1016
页数:18
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