Seismic Testing of Repaired Unreinforced Masonry Building having Flexible Diaphragm
Publication: Journal of Structural Engineering
Volume 130, Issue 10
Abstract
The in-plane rocking behavior of unreinforced masonry walls is generally perceived as a stable desirable behavior. However, there may be instances where the available lateral resistance of such walls would be inadequate. In that perspective, fiberglass strips were applied to damaged unreinforced masonry (URM) shear walls to increase their in-plane lateral load-resisting capacity. This paper reports on the dynamic response and behavior of a full-scale one-story unreinforced brick masonry building specimen having a flexible wood floor diaphragm. The shear walls were damaged in a previous test and repaired with fiberglass strips. The results demonstrate the effectiveness of fiberglass strips in enhancing the in-plane seismic response of URM walls failing in rocking and bed joint sliding mode. The response of the wood diaphragm and its interaction with the shear walls have also been studied. As a consequence of the increased in-plane lateral resistance of URM shear wall, the diaphragm was subjected to larger deformations in the inelastic range. The evaluation of experimental results and the comparison with the existing procedures have revealed that the diaphragm deflections observed experimentally closely matched those predicted using the Federal Emergency Management Agency 356 and Agbabian, Barnes, and Kariotis models.
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References
1.
Agbabian & Associates, S.B. Barnes & Associates, and Kariotis & Associates, (ABK) A Joint Venture. ( 1982). “Methodology for mitigation of seismic hazards in existing unreinforced masonry buildings: Interpretation of diaphragm tests.” Rep. No. ABK-TR-05 (draft), El Segundo, Calif.
2.
Agbabian & Associates, S.B. Barnes & Associates, and Kariotis & Associates, (ABK) A Joint Venture. ( 1984). “Methodology for mitigation of seismic hazards in existing unreinforced masonry buildings: The methodology.” Rep. No. ABK-TR-08, El Segundo, Calif.
3.
Atkinson, G., and Beresnev, I. (1998). “Compatible ground-motion time histories for new national seismic hazard maps.” Can. J. Civ. Eng., 25, 305–318.
4.
Bruneau, M. (1994). “Seismic evaluation of unreinforced masonry buildings - a state-of-the-art report.” Can. J. Civ. Eng., 21(3), 512–539.
5.
Canadian Standards Association, (CSA). ( 1994). “Masonry design for buildings.” CSA Standard S304. 1-94, Rexdale, Ontario, Canada.
6.
Costley, A. C., and Abrams, D. P. ( 1995). “Dynamic response of unreinforced masonry buildings with flexible diaphragms.” Rep. No. UILU-ENG-95-2009, Dept. of Civil Engineering, Univ. of Illinois at Urbana-Champaign, Urbana, Ill.
7.
Ehsani, M. R., and Saadatmanesh, H. (1997). “Fiber composites: An economical alternative for retrofitting earthquake-damaged precast-concrete walls.” Earthquake Spectra 13(2), 225–241.
8.
Ehsani, M. R., Saadatmanesh, H., and Velazquez-Dimas, J. I. (1999). “Behavior of retrofitted URM walls under simulated earthquake loading.” J. Compos. Constr., 3(3), 134–142.
9.
Epperson, G.S., and Abrams, D.P. ( 1990). “Evaluating lateral strength of existing unreinforced brick piers in the laboratory.” Proc., 5th North American Masonry Conf., Vol. 2, Urbana-Champaign, Ill., 735–746.
10.
Federal Emergency Management Agency (FEMA) ( 1992). NEHRP handbook for the seismic evaluation of existing buildings, FEMA 178, Building Seismic Safety Council, Washington, D.C.
11.
Federal Emergency Management Agency (FEMA) ( 1997). “NEHRP guidelines for the seismic rehabilitation of buildings.” FEMA 273 Building Seismic Safety Council, Washington, D.C.
12.
Federal Emergency Management Agency (FEMA). ( 1999a). “Evaluation of earthquake damaged concrete and masonry wall buildings, basic procedures manual.” FEMA 306, The Patnership for Response and Recovery, Washington, D.C.
13.
Federal Emergency Management Agency (FEMA). ( 1999b). “Repair of earthquake damaged concrete and masonry wall buildings.” FEMA 308, Washington, D.C.
14.
Federal Emergency Management Agency (FEMA). ( 2000). “Prestandard and commentary for the seismic rehabilitation of buildings.” FEMA 356, Washington, D.C.
15.
International Conference of Building Officials (ICBO). ( 1997). “Uniform code for building conservation.” Whittier, Calif.
16.
National Institute of Standards and Technology (NIST). ( 1997). “Development of procedures to enhance the performance of rehabilitated URM buildings.” Rep. No. NIST GCR 97-724-1, Building and Fire Research Laboratory, Gaithersburg, Md.
17.
National Research Council (NRC). ( 1992). “Guidelines for seismic evaluation of existing buildings.” Institute for Research in Construction, Ottawa.
18.
National Research Council of Canada (NRC). ( 1995). “National building code of Canada.” Ottawa.
19.
Paquette, J., and Bruneau, M. (2003). “Pseudo-dynamic testing of unreinforced masonry building with flexible diaphragm.” J. Struct. Eng. 129(6), 708–716.
20.
Prawel, S.P., and Lee, H.H. ( 1990). “The performance of upgraded brick masonry piers subjected to out-of-plane motion.” Proc., 4th National Conf. on Earthquake Engineering, Vol. 3, Palm Springs, Calif.,273–281.
21.
Reinhorn, A. M., and Madan, A. ( 1995a). “Evaluation of TYFO-W fiber wrap system for out of plane strengthening of masonry walls.” Preliminary Test Rep. No. AMR95-0001, Dept. of Civil Engineering, State Univ. of New York, Buffalo, N.Y.
22.
Reinhorn, A. M., and Madan, A. ( 1995b). “Evaluation of TYFO-W Fiber Wrap System for In Plane Strengthening of Masonry Walls.” Test Rep. No. AMR95-0002, Dept. of Civil Engineering, State Univ. of New York, Buffalo, N.Y.
23.
Tyfo ( 1997). “Tyfo systems for unreinforced masonry (URM) and reinforced concrete/masonry wall strengthening.” Fyfe Co. L.L.C., San Diego.
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Copyright © 2004 ASCE.
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Published online: Oct 1, 2004
Published in print: Oct 2004
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