Abstract
AbstractThis paper investigates the explosive spalling of high-strength concrete and the shear capacity of high-strength reinforced concrete (RC) beams, taking into consideration the impact of carbonation during and after a fire. First, the spalling model of the multi-scale platform was upgraded. In this study, the limit state of spalling was upgraded in consideration of the strain threshold of concrete in the strain softening range. This upgraded spalling model was validated by experiments on ultra-high-strength concrete during high-temperature heating. Based on the simulation results, explosive spalling was computationally predicted by the proposed model. Second, shear failure of high-strength RC beams subjected to high-temperature fire heating was analytically investigated and the proposed model was found to be able to roughly reproduce shear capacity and ductility after high-temperature heating. High concentration of carbon dioxide (CO2) was found to have a large effect on the shear behavior of RC beams, increase their stiffness and shear capacity.KeywordsMulti-scale modelingExplosive spallingHigh-strength concreteTension softeningCarbonationFire
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