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http://dx.doi.org/10.11112/jksmi.2013.17.3.028

Seismic Performance Assessment of Unreinforced Masonry Wall Buildings Using Incremental Dynamic Analysis  

Kwon, Ki Hyuk (서울시립대학교 건축공학과)
Kim, Man Hoe (서울시립대학교 건축공학과)
Kim, Hyung Joon (서울시립대학교 건축공학과)
Publication Information
Journal of the Korea institute for structural maintenance and inspection / v.17, no.3, 2013 , pp. 28-39 More about this Journal
Abstract
The most common housing type in Korea is low-rise buildings with unreinforced masonry walls (UMWs) that have been known as a vulnerable seismic-force-resisting system (SFRS) due to the lack of ductility capacities compared to high lateral stiffness of an UMW. However, there are still a little experimental investigation on the shear strength and stiffness of UMWs and on the seismic performance of buildings using UMWs as a SFRS. In Korea, the shear strength and stiffness of UMWs have been evaluated with the equations suggested in FEMA 356 which can not reflect the structural and material characteristics, and workmanship of domestic UMW construction. First of all, this study demonstrates the differences in shear strength and stiffness of UMWs obtained from between FEMA 356 and test results. The influence of these differences on the seismic performance of UMW buildings is then discussed with incremental dynamic analyses results of a prototype UMW building that were selected by the site survey of more than 200 UMW buildings and existing test results of UMWs. The seismic performance assessment of the prototype UMW building are analyzed based on collapse margin ratios and beta values repesenting uncertainty of seismic capacity. Analysis results show that the seismic performance of the UMW building estimated using the equations in FEMA 356 underestimates both a collapse margin ratio and a beta value compared to that estimated by test results. Whatever the estimation is carried out two cases, the seismic performance of the prototype building does not meet the criteria prescribed in a current Korean seismic code and about 90% collapse probability presents for more than 30-year-old UMW buildings under earthquakes with 2400 return years.
Keywords
Unreinforced masonry walls; Shear strength; Seismic performance; Incremental Dynamic analyses; Collapse margin ratio; Beta value;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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