Establish a Process to Detecting the Damage Depth of Concrete Structures after Exposure to High Temperatures by the Impact Echo Method

摘要

Although concrete is widely recognized as a fire-resistant material in construction industry, concrete undergoes severe changes in its chemical composition and physical properties when exposed to elevated temperatures. A wide range of studies had been performed to investigate the influence of heating rate, maximum exposure temperature, exposure time, and the post-fire-curing on the residual strength of concrete with various mixture proportions. Damage assessment is the first and the most important job for structural safety evaluation of a concrete building subjected to fire. In this paper, a series of analysis program to predict the temperature distribution in concrete slabs. Comparing with the experimental date from the previous studies and analysis results, and then simulating the stress wave propagation in the concrete slabs. The objectives of this paper is simulating and building-up a process to determine the damage depth of concrete after exposure to fire or high temperature.