Abstract: Seven single-story reinforced concrete masonry walls with dimensions of 3,20 m of length, by 2,80 m of height, 0,12 m of thickness and with reinforcement distributed in the two main dimensions, were evaluated in the laboratory using two different overlapping conditions for the horizontal reinforcement. The results were compared with the design capacity obtained with the equations specified in the Costa Rican Seismic Code, observing a higher shear strength in all the specimens, varying in a range between 135% and 177% of the code foreseen capacity.
The lateral shear-deformation curves obtained for each wall have been used as a basis for the calibration of a hysteresis model. Eight parameters defining the model, have been evaluated finding a good correlation between the experimental results and the ones achieved after the calibration process. A correction factor of the elastic stiffness was also determined to reflect the actual effective stiffness. The well-known damage index of Park&Ang has been calibrated to perform the seismic assessment and to estimate the expected damage on structures. The ductility parameter of the damage index, that correlates the displacement ductility for each cycle and the maximum displacement ductility, has been adjusted for a post-yielding point with an equivalent force of 80% of the maximum lateral shear observed. It was found that, on average, the displacement ductility factor is equal to 4,80.
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Authors:
D.A. Hidalgo-leiva, A.H. Barbat, L-G. Pujades, D. Acuña-García