Effectiveness of Rehabilitation on Seismic Behavior of Masonry Piers
Publication: Journal of Structural Engineering
Volume 133, Issue 1
Abstract
This paper summarizes research done to evaluate the effect of axial compression on unreinforced brick masonry (URM) walls and various rehabilitation techniques for enhancing seismic performance of URM structures. Flexural behavior of slender piers subjected to repeated and reversed in-plane deflections, and varied axial compression, is summarized relative to FEMA 356. The effectiveness of four rehabilitation techniques for improving seismic resistance are examined: (1) adhered fiber-reinforced polymer strips; (2) reinforced shotcrete overlay; (3) ferrocement surface coating; and (4) grouted reinforcing bars within drilled cores. The effectiveness of each technique is judged relative to the lateral strength and ductility of control piers with no rehabilitation, which are governed by a nonlinear, elastic rocking mode of behavior. Experimental results suggest that rocking behavior may be equal to, or superior to that of retrofitted piers because of the large ductility capacity at the component level. Test results also indicate that the FEMA 356 document conservatively characterizes seismic capacity for both nonrehabilitated and rehabilitated unreinforced masonry piers.
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Acknowledgments
Research on rehabilitation of unreinforced masonry piers was done as part of Project No. ST-6 of the Mid-America Earthquake Center. This work was supported primarily by the Earthquake Engineering Research Centers Program of the National Science Foundation. The laboratory work was done by Shaun Franklin and Jaret Lynch during their graduate study toward their Masters of Science degrees. Research was supervised by the Principal Investigator, Professor Daniel P. Abrams. Gratitude is extended to Omer Erbay for his general assistance.
References
Abrams, D. P. (1992). “Strength and behavior of unreinforced masonry elements.” Proc., 10th World Conf. on Earthquake Engineering, Madrid, Spain, Balkema Publishers, 3475–3480.
Costley, A. C., and Abrams, D. P. (1996). “Dynamic response of unreinforced masonry buildings with flexible diaphragms.” Technical Rep. No. NCEER-96-0001, National Center for Earthquake Engineering Research, State Univ. of New York at Buffalo, Buffalo, N.Y.
Epperson, G. S., and Abrams, D. P. (1989). “Nondestructive evaluation of masonry buildings.” Rep. No. 89-26-03, Advanced Construction Technology Center, Univ. of Illinois, Urbana, Ill.
Franklin, S., Lynch, J., and Abrams, D. P. (2003). “Performance of rehabilitated URM shear walls: Flexural behavior of piers.” Mid-America Earthquake Center Research Rep., Univ. of Illinois, Urbana, Ill.
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Lizundia, B., Holmes, W. T., Longstreth, M., Kren, A., and Abrams, D. P. (1997). “Development of procedures to enhance the performance of rehabilitated URM buildings.” Technical Rep. No. NIST GCR 97-724-1, National Institute of Standards and Technology, Gaithersburg, Md.
Magenes, G., and Calvi, G. M. (1997). “In-plane seismic response of brick masonry walls.” Earthquake Eng. Struct. Dyn., 26(11), 1091–1112.
Masonry Standards Joint Committee (MSJC). (2005). Building code requirements for masonry structures with specifications and commentaries, American Concrete Institute, Detroit, ASCE, New York, and The Masonry Society, Boulder, Colo.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 133 • Issue 1 • January 2007
Pages: 32 - 43
Copyright
© 2007 ASCE.
History
Received: Feb 3, 2004
Accepted: Feb 9, 2005
Published online: Jan 1, 2007
Published in print: Jan 2007
Notes
Note. Associate Editor: Tso-Chien Pan
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