Mitigation of Collapse Risk in Vulnerable Concrete Buildings
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Issue Date
2009-02Author
Matchulat, Lisa
Publisher
University of Kansas Center for Research, Inc.
Type
Technical Report
Is part of series
SM Report;93
Published Version
https://iri.ku.edu/reportsMetadata
Show full item recordAbstract
The goal of this study is to investigate the collapse risk of reinforced concrete building columns constructed prior to the mid-1970’s, subjected to cyclic lateral loading. These columns have reinforcement details deemed inadequate by modern seismic design standards, and as such are vulnerable to collapse. Testing of two fullscale, shear-critical column specimens was carried out at the NEES-MAST facility at the University of Minnesota. The test specimens had nominally identical material and reinforcement properties. The primary test variable was the applied axial load, which was held constant at 500 kips and 340 kips for the first and second specimens, respectively. The specimens were subjected to increasing lateral displacement cycles until axial load carrying capacity was lost. The thesis discusses the observed lateral and axial load resisting behavior, and analyzes the measured responses of the columns up to and beyond the lateral drift at which they were able to sustain axial load. Test results indicate that column behavior was significantly influenced by the magnitude of the applied axial load, and that the ratio of axial load to gross axial capacity of the longitudinal reinforcement is a key parameter in identifying columns in which axial failure occurs simultaneously with shear failure.
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Citation
Matchulat, L., "Mitigation of Collapse Risk in Vulnerable Concrete Buildings," SM Report No. 93, National Science Foundation and the University of Kansas Center for Research, Inc., Lawrence, Kansas, January 2009, 123 pgs.
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