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Experimental study and numerical simulation on seismic behavior of reinforced concrete columns under freeze-thaw cycle

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Document pages: 13 pages

Abstract: The freezing and thawing of concrete is responsible for the serious damage of reinforced concrete buildings, which may lead to premature failure with little warning. Therefore, it is necessary to consider the influence of freeze-thaw environment on the seismic performance of reinforced concrete structures. In this paper, quasi-static tests of four reinforced concrete columns with different freeze-thaw cycles are carried out. The results show that FTCs have effects on the bearing capacity, ductility, strength and stiffness of reinforced concrete columns. More importantly, when it is simply assumed that the freeze-thaw damage degree of reinforced concrete members is uniform, the simulation results are usually less than the experimental results. Therefore, a numerical model considering the uneven distribution of freeze-thaw damage is establishedoposed by utilizing the results of Petersen’s test for relative dynamic modulus of elasticity (RDME) for different depths of concrete sample and based on Berto’s method which was proved to be effective to convert the numbers of FTCs under different freeze-thaw conditions. On the basis of the existing constitutive relations for concrete, four RC columns subjected to different numbers of FTCs were simulated by OpenSees. As a result, the simulation hysteretic curves were in good agreement with the experimental ones.

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