NUMERICAL SIMULATION OF SQUAT RC SHEAR WALLS WITH FREEZE-THAW DAMAGE

This study evaluated the seismic performance of RC shear walls under freezing and thawing environment. The results of the quasi-static tests of eight freeze-thaw damage squat RC shear walls were analyzed by using theoretical analysis and experimental regression. A shear hysteresis model of a squat RC shear wall was proposed considering the degree of freeze-thaw damage and the axial load ratio. Subsequently, a numerical simulation method of the squat RC shear wall was put forward considering the combined shear effect and uneven freeze-thaw damage. Comparing the simulation results with the experimental results, it is found that the hysteresis curve, the skeleton curve, and the cumulative energy dissipation were in good agreement with the experimental results, which indicated that the numerical simulation method proposed in this paper can accurately reflect the mechanical properties and seismic performance of squat RC shear walls with freeze-thaw damage, and can be used for seismic performance evaluation of in-service RC shear walls in frost action regions.