Experimental study on anchorage performance of steel bar-corrugated pipe grouted connection

Abstract

An experimental study was conducted to evaluate the effects of the temperature and the anchorage length on the pullout resistance of steel bar-corrugated pipe grouted connection. Three anchorage lengths of 0.4 la , 0.6 la and 0.8 la and six temperature gradients of normal temperature, 200 ℃, 300 ℃, 400 ℃, 500 ℃ and 600 ℃ were selected as test parameters. The pull-out tests were carried out on 18 steel bar-corrugated pipe grouted connections to study the failure mode and ultimate tensile force of the connector with different anchorage length after different temperature. The results showed that the specimens with an anchorage length of 0.4la had concrete splitting failure, and the specimens with anchorage length of 0.6la had steel bar breaking failure at room temperature, while concrete splitting failure after high temperatures of 200℃ and above. The specimens with anchorage length of 0.8la had concrete splitting failure at room temperature, and steel bar breaking failure after other temperatures, which indicated that the failure mode of the specimen is closely related to the temperature and anchorage length. With the increasing of temperature and the decreasing of anchorage length, the ultimate tensile force of the specimen improved. In this paper, the relationship between the ultimate tensile force and temperature and anchorage length was given, and the calculation results were compared with the experimental results, which provide the reliability of the formula. Finally, the test results were verified by finite element simulation.