Open AccessSeismic forces in base-isolated masonry structures
Author(s) -
M. J. N. Priestley,
R. L. Crosbie,
Athol J. Carr
Publication year - 1977
Publication title -
bulletin of the new zealand society for earthquake engineering/nzsee quarterly bulletin
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.917
H-Index - 36
eISSN - 2324-1543
pISSN - 1174-9857
DOI - 10.5459/bnzsee.10.2.55-68
Subject(s) - masonry , structural engineering , cantilever , stiffness , hinge , shear wall , base (topology) , geology , shear force , reduction (mathematics) , engineering , geotechnical engineering , mathematics , geometry , mathematical analysis
Dynamic analyses of four, eight and twelve storey masonry shear walls supported on base-isolation systems are described. Each wall was modelled as a multi-degree-of-freedom cantilever. Results are presented which indicate behaviour is more complex due to the significance of higher mode effects, than was previously believed on the basis of simple single-degree-of-freedom models. The influence of different types of base-isolation, and of the stiffness of the gravity supporting system, are discussed. Tentative design recommendations are proposed which provide a substantial reduction in design forces for short period structures while still maintaining an adequate margin of safety against the formation of wall hinges.