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The practical calculation method for the residual strength of reinforced concrete columns with +-shaped cross section after exposure to ISO834 standard fire is investigated. Using a numerical program CAFIRE, the influence of several parameters, such as exposure times, effective lengths, sectional thicknesses, ratios of sectional height to sectional thickness, load eccentricity ratios, reinforcement...
Four full-scale reinforced concrete (RC) columns with L-shaped cross-sections, four full-scale RC columns with T-shaped cross-sections, three full-scale RC columns with +-shaped cross-sections, and one full-scale RC column with a square cross-section were experimentally investigated for fire resistance following the ISO834 standard heating process. The effects of axial load ratio and fire exposure...
Most of the previous investigations studied the structural behavior of concrete columns with ‘+’-shaped cross section at room temperature, but the behavior of such columns during a fire and the effect of boundary conditions on the mechanical properties of the heated columns have seldom been examined. In this paper, the influence of axial-and-rotational restraint on the behavior of heated concrete...
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