Abstract
The bearing capacity and durability of reinforced concrete (RC) structures can be affected by fire. In this study, a three-dimensional (3D) meso-scale simulation model for RC short column subjected to axial compression after exposure to fire was established. The degradation effect of mechanical properties of steel bars and concrete materials after high temperature was taken into account. The bond-slip behavior between longitudinal steel bars and concrete was also considered in the model. Based on the present simulation method, the failure mode and failure mechanism of the RC short columns were investigated. Moreover, the effects of fire scenario and fire duration on the axial compression performance of RC short columns were further investigated. It is found that the meso-scale numerical model can effectively simulate the mechanical behavior of RC short columns under axial load. Moreover, with the increase of fired surfaces and fire duration, the peak bearing capacity, axial compression stiffness and ductility decrease. The mechanical properties of short columns decrease more quickly under non-uniform fire. By comparing the theoretical value with the numerical simulation value of Nut/Nu, it is found that the theoretical value is conservative.
Highlights
As the main load-bearing components, reinforced concrete (RC) columns may experience local or even overall damage due to the high temperature, losing a portion of its bearing capacity and affecting the service life of buildings
The influence of load, section size, concrete strength and other parameters on the fire resistance of RC columns were analyzed by numerical model [4, 5]
The peak strain of side columns increases with the fire duration, which indicates that the concrete material softens after high temperature
Summary
As the main load-bearing components, reinforced concrete (RC) columns may experience local or even overall damage due to the high temperature, losing a portion of its bearing capacity and affecting the service life of buildings. On the basis of some assumptions, Nguyen et al [6] developed a simplified theoretical analysis model for calculating temperature induced restraint force. It can be seen through the abovementioned work, a lot of efforts have been devoted and promoted to the understanding of the failure mode and damage mechanism of RC columns under the action of fire or high temperature. In this study, a three-dimensional (3D) meso-scale finite element (FE) numerical models for RC short column considering bond-slip behavior were established to investigate the axial compression behavior after exposure to fire
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