| Creep is one of the most important long-term behaviors, on which there have been lots of researches carried out. So far, as a major environmental factor in creep, temperature effects on concrete creep have attracted much attention for over forty years. However, many unsettled problems are left to be investigated deeply. And there is a little work about temperature effect on creep of axially compressed Concrete Filled Steel Tubular (CFST) members at present.In this paper, the numerical differential method of temperature effect on concrete creep by micro-prestressed solidification theory model with B3 model parameters is introduced into creep calculation of CFST members. A new creep model is developed for temperature effect on eccentrically compressed CFST members, with analysis of mechanical characteristics of CFST beam-column members. The calculated results are compared with experimental data under normal temperature. It shows the model is reasonable and applicable to CFST beam-column members.Based on the above work, a detailed analysis is given considering the influence of temperature factors and non-temperature factors of CFST members. The temperature effect is investigated under five different temperatures, namely higher and lower than normal temperature, first increasing then decreasing temperature, cyclic temperature and continuum rising temperature. In addition, non-temperature factors are discussed under higher temperature, including water cement ratio, aggregate cement ratio, steel ratio, eccentricity, axial load, and loading age.
|
PDF Full Text Request