| With the development of the national economy, steel reinforced concrete (SRC) has been widely used, people’s understanding of SRC is also becoming more comprehensive and in-depth, so far, study on SRC columns is mainly concentrated in the ultimate axial capacity, the cohesional strength and the seismic performance of SRC columns, research on the shrinkage and creep of concrete under axial sustained loading is very little, furthermore, the experimental and theoretical studies of long-term behavior of steel-concrete composite structure are mainly aimed at concrete filled steel tube (CFST). As the concrete of CFST is filled in the tube and the concrete of SRC is exposed to the environment, their characteristics of creep and shrinkage under axial sustained loads are different, the conclusions of the research on CFST column cannot be fully applied to steel reinforced concrete column. on this account, this paper studies on the long-term behavior of steel-reinforced concrete columns under axial sustained compression.In this paper, the following researches have been completed:①Provides experimental study on the long-term behavior of short SRC columns under axial sustained loading, and on their ultimate axial capacity, observe the development of shrinkage and creep and then analyse the effects of shrinkage and creep upon the axial compressive strength of SRC column;②Introduce the mechanism of concrete shrinkage, creep and the influence factors of shrinkage and creep of concrete, Summarize the prediction models of shrinkage, and creep, Select the appropriate prediction models to calculation the values of shrinkage and creep of concrete. Using age-adjusted effective modulus method (AEMM) to calculate the deformation of SRC columns under axial sustained load.③Based on the above results, Using the finite analysis software ANSYS to simulate the shrinkage and creep of concrete by the implicit creep method and explicit creep method, calculation the deformation of SRC columns under axial sustained load caused by the creep and shrinkage of concrete, And compared with the experimental data and the theoretical values obtained from the AEMM method.④Study The effect of concrete shrinkage, creep of reinforced concrete axial compression bearing capacity by ANSYS simulation, And verification them with test data, the results showed that the axial sustained load have no significant effect upon the axial compressive strength of the SRC columns. |
