A Micro-plane Damage Model for Plane Concrete after Exposure to the High Temperature

An attempt is made on a micro-plane damage model to take on constitutive behavior of concrete after exposure to the high temperatures. The constitutive equation using a damage formulation which was developed by Labibzadeh et al. (2006) has been adapted here to account for the effects of elevated temperatures. The damage formulation has been founded upon five fundamental damage functions which are directly related to the loading history of each micro-plane. The available damage functions for the model include a bunch of experimental variables dependant on thermal and mechanical issues. Optimum values for these parameters require meticulous experimental treatments to draw a precise conclusion either on uniaxial or multiaxial responses. Also elastic modulus varying with raising temperature is accepted as a clue to push thermal damage to the model.The characteristic feature of the proposed model has been investigated by published experimental results for uniaxial compression and tension tests. This model is developed in Visual Fortran computer language and could be easily implemented into a 3D finite element code to present a crack-damage analysis, also understanding the behavior of designing structures during the fire events

Keywords:

Constitutive equation , Micro-plane , Damage , Crack analysis