Experimental and numerical study on evolution of thermodynamic properties of reinforced concrete beams under fire
In order to study the influence of load state and fire exposure time on the thermodynamic properties of reinforced concrete beams,10 T-beams were designed for fire tests and static load tests,respectively.Considering the effects of concrete high-temperature spalling and bond-slip degradation between reinforcement and concrete,a numerical analysis model of con-crete beam was established by Abaqus,and the feasibility and rationality of the numerical model were verified by comparison with the test and theoretical calculation results.The results show that the sectional temperature and mid-span deflection in-crease with the increase of fire exposure time and load ratio respectively.The fundamental frequency presents fluctuating de-crease with the increase of fire exposure time.The numerical simulation temperature are in good agreement with those meas-ured in the experiments.The simulated value of flexural capacity is slightly higher than the test value,but the relative error of both is less than 10%.The simulation frequency curve is in good agreement with the wave attenuation trend of measured fre-quency.The research results can provide reference for fire damage assessment of concrete structures.
NETL
NSTL
万方数据
维普
