Mesoscale Simulation of Deformation for Mortar and Concrete under Cyclic Freezing and Thawing Stress
Mesoscale Simulation of Deformation for Mortar and Concrete under Cyclic Freezing and Thawing Stress
复制标题
循环冻融应力下砂浆和混凝土变形的细观模拟
DOI：
10.3151/jact.13.291
复制
发表时间：
2015-06-01
影响因子：
2
通讯作者：
Ueda, Tamon
中科院分区：
文献类型：
--
作者：
Gong, Fuyuan;Wang, Yi;Ueda, Tamon
混凝土材料作为一种多孔介质，在冻融循环过程中，即使没有外部荷载作用，混凝土材料仍有可能受到内部孔隙压力（如水压力、结晶压力和低温吸力）的破坏。本文采用刚体弹簧法（RBSM）建立了细观模型，模拟混凝土在FTC循环下的变形行为。一方面，将宏观材料划分为细观尺度的刚性小单元，另一方面，基于孔隙力学理论，将细观尺度内孔压视为细观尺度内孔压的平均值。建立了反映多孔体与冰水系统变形协调性的本构关系。最后，用RBSM对砂浆和混凝土的内部开裂和残余变形进行了模拟，模拟结果与试验结果吻合较好。
As one kind of porous medium, even without external loading, concrete material is still possible to be damaged by the internal pore pressures, such as hydraulic, crystallization and cryosuction pressures during freezing and thawing cycles (FTC). In this paper, a mesoscale model using Rigid Body Spring Method (RBSM) is developed to simulate the deformation behaviors of concrete under FTC cycles. On one hand, the macroscopic material is divided into small rigid elements of mesoscale; on the other hand, the microscale internal pore pressures are regarded as average values in mesoscale based on poromechanical theories. The constitutive relation is also developed to reflect deformation compatibility between porous body and ice-water system. Finally, the internal cracking and residual deformation are simulated for mortar and concrete using RBSM, which are found in a good agreement with previous experimental data.