A Shear Damage Element Model for Concrete and Its Application

Abstract:

Based on the features of shear failure of concrete,the shear damage element,which comprises the elastic part and the plastic part,is introduced.Furthermore,a new kind of idealized mesoscopic damage model,which the material is represented by a set of the elements of equal stiffness that are joined in parallal,is developed for concrete under monotonic axial compressive loading.The model can well explain the experimentallyobserved nonlinearity of stressstrain curve,stiffness degradation and strain softening,etc..The constitutional law for concrete under axial compression is established.Also,a simple analysis method for plastic strain is put forward.With damage and elasticity modulus as random variables,stochastic equations of damage growth and stressstrain are presented.With the help of stochastic structural modeling and optimization methods,coefficients in the model,for example,the distribution parameter of the random field of failure strain,can be easily determined by the full stressstrain curves of concrete specimens under axial loading.Comparison with the test results shows that the analytical values agree well with the test.