An experimental study of confined masonry walls with varying aspect ratios

Results from an experimental series of seven full-scale confined masonry walls with height-to-length aspect ratios (H/L) from 0.3 up to 2.2 are summarized. Results show that neither the level of axial stress nor the aspect ratio had a significant effect on lateral stiffness. Inelastic behavior of th...

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Bibliographic Details
Published in:Earthquake spectra 2015-05, Vol.31 (2), p.945-968
Main Authors: Perez Gavilan, J. J, Flores, L. E, Alcocer, S. M
Format: Article
Language:English
Subjects:
accuracy
Aspect ratio
attenuation
building codes
buildings
construction
cracks
cyclic loading
degradation
Demand
Ductility
earthquakes
Engineering geology
experimental studies
failures
flexure
geometry
lateral loading
loading
Masonry
prediction
seismic energy
Seismology
shear strength
Spectra
Stiffness
Strength
stress
structures
Walls
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Summary:Results from an experimental series of seven full-scale confined masonry walls with height-to-length aspect ratios (H/L) from 0.3 up to 2.2 are summarized. Results show that neither the level of axial stress nor the aspect ratio had a significant effect on lateral stiffness. 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 normalized shear strength was observed for walls with decreasing aspect ratio. A correction factor to the nominal cracking strength was deduced based on differences of the flexural deformations for squat and square walls. The factor was then compared to the experimental normalized strength with good agreement. A new expression for inclined cracking shear that can be used for a wide range of wall aspect ratios is proposed.
ISSN:8755-2930
1944-8201
DOI:10.1193/090712EQS284M