Abstract
Abstract Civil structures are, normally, subjected to gravitational and thermal loads. The association of the effects of these loads should be the object of analysis when the loss of stability of the slender columns was verifying. In the case of reinforced concrete structures, temperature variations induce internal stresses in addition to gravitational ones since they are caused by the difference in the thermal properties of steel and concrete. Since the structure is a slender system, its stiffness was divided into two parts. In the first one, the properties of the concrete were introduced, including cracking and creep, doing the equations obtained at the time-dependent mathematical process. In the second, the geometric, the construction imperfections and the internal efforts mobilized by the temperature variation were considered. Additionally, strains and thermal loads were considered together. At the end, the values of critical buckling loads for different moments of interest were determined.
Highlights
Civil structures in reinforced concrete commonly are subjected to a combination of mechanical and thermal loads
For slender reinforced concrete columns, the thermal variation must be added to the creep effects, as well as those produced by the sustained loads, including the structural elements self-weight
It is important to emphasize that this paper presents an analytical approach to evaluate the frequency and stability by buckling, of slender columns subject to thermal variation and self-weight
Summary
Civil structures in reinforced concrete commonly are subjected to a combination of mechanical and thermal loads. For slender reinforced concrete columns, the thermal variation must be added to the creep effects, as well as those produced by the sustained loads, including the structural elements self-weight. The previously mentioned aspect is an important point in analysis because when a structural element with geometry varying along the length is presented to study, computational methods based on modeling are required for solving the problem. In these computational methods, normally, the medium needs to be discretized and the results stay conditioned to the density of that discretization. At the end of the process, the values of critical buckling loads at different moments of interest were determined
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