Reinforcement of Masonry Walls Subjected to Seismic Loading Using Steel X-Bracing
Publication: Journal of Structural Engineering
Volume 124, Issue 8
Abstract
A design criterion is proposed for the seismic reinforcement of masonry stuctures by joining shear walls with steel X-bracing. The seismic response of the coupled system was investigated in the time domain by a step-by-step integration. Two suitable mechanical models for the shear walls and the X-bracing were used. A wide parametric analysis was performed varying the mechanical characteristics of the masonry walls as well as the X-bracing. Using 20 simulated ground motions the uncertainties related to the definition of seismic loading were taken into account. The results obtained established a structural design criterion based on the equivalent static lateral force method. Given this criterion, the structural factor of the steel X-bracing had to be reduced. This reduction was necessary due to the mixed matched interaction of the two different seismic behaviors. The reduction was based on a suitable coefficient, named the “coupling parameter.” This coefficient is given in specific graphs proposed for design purposes.
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Copyright © 1998 American Society of Civil Engineers.
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Published online: Aug 1, 1998
Published in print: Aug 1998
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