Experimental Research on Tensile Properties of Chemical Anchor Bolt Groups after High Temperature

Abstract

In order to research the tensile properties of chemical anchor bolt groups after high temperature, five groups of 15 chemical anchor bolt groups specimens were designed and manufactured. The pull-out test of specimens subjected to different temperatures and constant temperature time is carried out to explore their damage mode and high temperature damage mechanism, analyze the effects of different temperatures and constant temperature time on their tensile load capacity, and establish the calculation formula of tensile properties of chemical anchor bolt groups. The research results showed that the specimens were not subjected to high temperature had concrete cone failure, and the specimens were subjected to high temperature had concrete mixed failure or splitting failure. High temperature damage is the result of the combined action of the chemical anchor bolt and the substrate concrete. The discounting effect of temperature on the tensile properties of chemical anchor bolt groups specimens is obvious, while the effect of constant temperature time on the tensile properties of chemical anchor bolt groups specimens is small. The calculation results of the established tensile properties formula basically match with the test results.