Abstract
Based on the sequential coupling method and the temperature rise curve according to ISO-834, the ABAQUS numerical models of grout sleeve splicing joint was established. At a different fire exposure time, the temperature field and ultimate tensile strength of splicing joint were numerically analyzed. Meanwhile, by means of the stress distribution analysis of grouting material, the failure mechanism of splicing joint was put forward. Numerical simulation result shows that under the action of ultimate tensile load, the Mises stress of rebar decreases gradually along axial direction from uploaded end to non-loaded end, the Mises stress of sleeve increases gradually along axial direction from sleeve end to middle cross section, and the stress distribution of grouting material is relatively uniform. Furthermore, with the increase of fire exposure time, the stress state of grouting material changes from trip-direction compressive state to trip-direction tensile state gradually, which leads to the ultimate tensile load of grout sleeve splicing joint decreases.
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