Statistical damage constitutive model for concrete materials under uniaxial compression

BAI Wei-feng^1,2, CHEN Jian-yun¹, FAN Shu-li¹, LIN Gao¹

1.Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian 116023,China;2.Research Institute of Steel and Enginering,North China Institute of Water Conservancy and Hydrodectric Power,Zhengzhou 450011,China



Abstract:

According to the damage mechanism of concrete material during the uniaxial compressive failure process,this paper further establishes the statistical damage constitutive model of concrete subjected to uniaxial compressive stress based on the statistical damage model under uniaxial tension. The damage evolution law in the direction subjected to pressure is confirmed by the tensile damage evolution process of lateral deformation due to the Poisson effect,and then the compressive stress-strain relationship is defined. The peak nominal stress state and the critical state occurring in the macro longitudinal distributed splitting cracks are distinguished. The whole loading process can be divided into the even damage phase and the local breakage phase. The concrete specimen is divided into the failure process zone and the resting unloading zone. The size effects during the local breakage phase under the uniaxial monotonic compressive process and the hysteretic phenomenon under the cyclic compressive loading process are analyzed. Finally,the comparison between theoretical results and experimental results preliminarily verifies the rationality and feasibility of understanding the failure mechanism of concrete through the statistical damage constitutional law.

Key words:  uniaxial compression  constitutive model  mesoscopic damage evolution  strain softening  size effects

DOI£º10.11916/j.issn.1005-9113.2010.03.009

Clc Number:TU528.0

Fund: