Resumo

PEREZ GAVILAN, Juan José; FLORES, Leonardo  e  ALCOCER, Sergio. Efecto de la esbeltez en la resistencia de muros de mampostería confinada. Ing. sísm [online]. 2013, n.89, pp.55-76. ISSN 0185-092X.

Results from an experimental program of seven full-scale confined masonry walls with height-to-length aspect ratios (H/L) from 0.3 up to 2.2 are summarized. The potential change of lateral stiffness, before the first inclined cracking, with vertical load was investigated. Lateral stiffness and strength degradation of walls with cyclic lateral loads was studied. Results showed that neither the level of axial stress nor the aspect ratio had a significant effect on lateral stiffness. Also, the inelastic behavior of the walls, characterized by normalized stiffness degradation with ductility demand, can be estimated with good accuracy with a bilinear function for a ductility demand up to 4.5. A substantial increase in shear cracking strength, normalized relative to the nominal strength, with a reduction of aspect ratio, was observed. An expression to estimate the normalized cracking shear strength, as a function of aspect ratio, was developed. Results from this expression are in good agreement with the experimental results. A new expression for cracking shear strength is proposed for design.

Palavras-chave : confined masonry; slenderness; shear strength; aspect ratio.

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