Resumen

SANCHEZ, Sulpicio; ARROYO, Roberto  y  JEREZ, Sandra. Modelo de un grado de libertad para evaluar la curva carga lateral-distorsión en muros de mampostería confinada. Ing. sísm [online]. 2010, n.83, pp.25-42. ISSN 0185-092X.

This paper shows a simple model to evaluate the backbone curve of confined masonry walls (CMW) tested under lateral load. In this way, the shear stress vs. shear strain relationship obtained from the diagonal tension tests is used to model the masonry behavior by means of a spring element. Then, a single degree of freedom equivalent system, which takes account only the shear horizontal deformations, represents the concrete tie-column and masonry elements. A non-linear static analysis is developed in order to evaluate the backbone curve. Experimental results of CMW and structural systems tested in Mexico are used to compare the numeric results. Thus, the model has an adequate agreement until a distortion equal to 0.45 % or 0.35 % for CMW built from solid clay bricks or concrete blocks, respectively. Both values are greater than the permissible distortion proposed by the Mexico City Code. Besides, the results agreement is similar to that obtained from numerical models developed by means of the finite element method, wide column model, or equivalent strut model.

Palabras llave : confined masonry walls; diagonal tension; backbone curve; solid clay brick; distortion.

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