Simulation on seismic performance of the post-fire precast concrete column with grouted sleeve connections

A simulation method with Abaqus software was adopted to analyze the seismic performance of post-fire precast concrete column with grouted sleeve connections. First, the simulation was exerted on the column at ambient temperature and the grouted sleeve connection was simplified to be a single steel rebar. It is found that the yield load, lateral peak load and ductility coefficient from the simulation result are about 0.89, 0.85, and 1.02 times of those from the test respectively, which shows that the built finite element model is fit for the simulation analysis of precast concrete column and the simplified method of grouted sleeve connection is feasible. Then, a sequential coupling method was used to simulate the seismic performance of cast-in-place column after exposure to elevated temperatures. It is found that the highest temperature, load and ductility coefficient from simulation agree well with those of test, as the maximum difference is only 5.0%. Furthermore, simulations of post-fire precast concrete columns with grouted sleeve connections were based on these practices and the findings as follows: as the elevating time becomes longer, the maximum difference of the highest temperature between the simulation and the theory decreases from 6.7% to 0.6%; compared to the condition at ambient temperature, the lateral peak load decreases linearly along with the elevating time ascending. Finally, a new expression was proposed to calculate the shear bearing capacity of post-fire precast concrete column with grouted sleeve connections, which will be beneficial to the fire safety design of precast concrete structures.