Seismic Damage Analysis and Design of Unreinforced Masonry Buildings
Kwok, Yan Hoe
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https://hdl.handle.net/2142/69966
Description
Title
Seismic Damage Analysis and Design of Unreinforced Masonry Buildings
Author(s)
Kwok, Yan Hoe
Issue Date
1987
Department of Study
Civil Engineering
Discipline
Civil Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Civil
Abstract
A model for evaluating the structural damage to masonry buildings subjected to earthquake ground motion is proposed. Damage is expressed as a combination of the effects of excessive deformation and repeated loadings. Model parameters for unreinforced brick masonry were obtained from cyclic load tests of masonry wall specimens. A random vibration method using a nonlinear hysteretic restoring force model to describe the load-deformation behavior of masonry was adopted to evaluate the response statistics required for damage assessment. The proposed damage model was calibrated using observed damages to masonry buildings during past earthquakes.
A simplified method for damage assessment, in which seismic damage is expressed as a ratio of the seismic loading to the structural resistance, is proposed. A damage-limiting design method, based on the equivalent lateral load procedure used in many building codes, is developed in which the base shear coefficient is expressed as a function of the damage level. Two design examples indicate the effectiveness of the design method to limit seismic damage to a tolerable level.
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