Creep model prediction of concrete-filled steel tube members under axial compression considering temperature effect
In order to study the creep model of concrete-filled steel tube(CFST)structure under the combined action of steel ratio,core concrete strength and temperature,the creep tests were conducted on CFST specimens with steel ratio of 6.6%,9.2%and 12.5%under long term axial compression load in both room temperature and convenient environments.The creep strain of CFST specimens with different steel ratios at different temperatures was measured for 297 days.The results show that the creep of CFST decreases nonlinearly with the increase of steel ratio.The temperature has a great effect on the creep of CFST.Comparing with the calculated values of 9 common creep models,the model of 15 gauge is most suitable for CFST structure at room temperature environment.Based on the activation energy theory,the creep model of CFST members at room temperature was modified,and the creep model of CFST under the combined action of steel ratio,core concrete strength and temperature was obtained.
concrete-filled steel tubecreeptemperaturesteel ratio
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