Experimental Study On The Tensile Capacity Of Post-installed Rebar Specimens Under High Temperature

Post-installed rebar connection is a widely-used connection technology in the fields of strengthening and retrofitting engineering. Current research findings are mostly about post-installed rebar in normal conditions, while in practice the anchorage systems are always at the risk of fire, otherwise, some of them are working under high temperature. In this paper, based on research achievements of the tensile experiment with different embedment depth, different temperature the specimens suffered, the mechanical properties of the post-installed rebar connection are correlated with the embedment depth and suffered temperature. The relational models of tensile capacity, critical bond stress and suffered temperature are carried out.The study carried out in this thesis includes the following aspects:1. Based on a general review on the current achievements obtained by foreign and native researchers, the mechanical properties of post-installed rebar connection are presented. The thermal and mechanical properties of concrete are also presented.2. The test specimens are heated in an electric furnace, while the temperature in the specimen is tested simultaneously by thermal couple. When the interior temperature of the specimen reaches to the setting value, then keep the temperature. The tensile load is applied with fixed ratio. The tensile capacity is measured. The failure mode of post-installed rebar specimens of different embedment depth under different temperature is supervised.3. Through the analysis of the test data, the relation between the mechanical performance of post-installed rebar connection and the embedment depth, suffered temperature is educed, as well as the constitutive equations. Contrast with tensile capacity of post-installed rebar in normal temperature, the loss evaluation in different suffered temperatures is figured out. The curve diagrams, which can be reference data in the design of post-installed rebar connection in high temperatures, are also drawn.4. Finite element software-ANSYS is used to simulate the behavior of post-installed rebar connection specimens under high temperatures. The results are comparable with data and phenomena of experiment in loading capacity, failure mode, deformation and displacement.At last, generalization of whole content of this paper is issued and advices on further research are presented.