Experimental study on detecting stress damage state of concrete by coda interferometry
In order to accurately detect the internal stress damage state of concrete,the ultrasonic coda interference test is carried out on four concrete test blocks and short columns with different strength levels by using Ritec nonlinear high-energy ultrasonic testing system.The coda velocity change rate-stress(dv/v-σ)curve is established,the coda velocity change rate and stress state model are constructed according to the curve slope,and the concrete damage state is studied.The results show that the damage process of concrete is divided into three parts:0-40%ultimate compressive strength,40%-70%ultimate compressive strength and 70%ultimate compressive strength to failure.According to the stress state model,the stress range and damage state of concrete in the process of bearing load can be clearly determined,and then its safety state can be evaluated.
concretecoda velocity variationstress statemodeldamage state
万方数据
维普
