ABSTRACT
As a new type of fastening material with convenient construction, good stress, fire resistance, and corrosion resistance, the chemical anchor bolt is widely used in many industries such as building curtain walls, road traffic, bridges and tunnels, and marine hydraulics, which is one of the most important post anchoring technologies. To analyze the damage mechanism of chemical anchor bolt groups after freeze-thaw cycles, 4 groups of 12 chemical anchor bolt groups specimens were designed and fabricated. Tensile tests were carried out on the group anchor specimens with undergone different freeze-thaw cycles to explore their damage mechanism and damage factors and calculate the energy consumption of external load work. The test results show that the adhesive force between the chemical anchor bolt and the base material concrete can be regarded as the chemical adhesive force, friction force, and mechanical biting force. The main cause of freeze-thaw damage to concrete is the difference in the pore water pressure inside the base material concrete. The tensile process of chemical anchor bolt group specimens with splitting failure is divided into three stages, which are defined as the linear stage, local debonding stage, and splitting failure stage. The temperature change causes the expansion stress of the base material concrete, the stress action will lead to the formation of cracks in the base material concrete, and the development of cracks will lead to the failure of the test piece, which requires higher energy to absorb the external load to work, and the energy consumption is obvious.
