Mechanical Behavior and Constitutive Equation of Concrete under High-Temperature Dynamical Conditions

Abstract

SPHB tests of concrete under different temperatures and various loading conditions are completed, and high-temperature dynamical behavior of concrete is obtained. Dynamical mechanical behavior of concrete with high temperature is affected by not only the strain rate effect, but also the high temperature weakening effect, and the strain rate hardening effect is coupled with high temperature weakening effect, but the latter has greater influence. Concrete failure evolution is described on basis of the damage factor, the intercoupling strain rate hardening effect and temperature weakening effect are simply set as mutually independent factors, each parameter is respectively fitted with test data, finally, concrete constitutive equation under high-temperature dynamical conditions is established, and comparative analysis with test data are conducted, indicating good coincidence with test results.

Experimental study on high-temperature resistance of alkali-activated slag concrete block masonry

“…In addition, as the temperature increased, the bond between the block and mortar gradually degraded, especially when the horizontal ash joint was significantly deteriorated, resulting in a constant increase in strain. The peak compressive strain of concrete prismatic specimens after exposure to 600 °C-800°C was generally 2-4 times the peak compressive stain at room temperature (Jia B et al, 2014;Wang and Zhu, 2019). Zemri and Bouiadjra (2020) reported that the peak compressive strain of the AASCM mortar after exposure to 650°C was approximately five times the peak compressive strain at room temperature.…”