Thermal damage evolution of concrete

摘要

Most damage theories nowadays consider the problems with equal temperature, and there are few studies on the damage behaviour in the changing-temperature environment, particularly in which with high temperature. This paper introduced "remnant intensity" into damage constitutive relation, and built concrete's "thermal damage" evolving equation under high temperature, from which the damage values at different temperature can be obtained. This method is concise, and the experiment can be performed easily, so it will be convenient for engineering application. Combined with numerical methods, the evolving equation can be used to analyse the process of loading and destroying of concrete structures on fire. In the architecture field today, the effects of fire to buildings have attracted wide-ranging attention, so it is necessary to study the damage behaviour of concrete (one of main architecture materials) at high temperature.