Behavior of Retrofitted URM Walls under Simulated Earthquake Loading
Source abstract
Abstract
Unreinforced masonry (URM) buildings perform poorly under seismic forces and have been identified as the main cause of loss of life in recent earthquakes. Many of these structures fail in out-of-plane bending due to the lack of reinforcement. In this study, the experimental results from three half-scale unreinforced brick walls retrofitted with vertical composite strips are presented. The specimens were subjected to cyclic out-of-plane loading. Five reinforcement ratios and two different glass fabric composite densities were investigated. The mode of failure is controlled by tensile failure when wider and lighter composite fabrics are used and by delamination when stronger ones are used. The tested specimens were capable of supporting a lateral load up to 32 times the weight of the wall. A deflection as much as 2% of the wall height was measured. Although both URM walls and composite strips behave in a brittle manner, the combination resulted in a system capable of dissipating some energy. Retrofitting URM walls with composite strips proved to be a good and reliable strengthening alternative.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Masonry and Concrete Structural Analysis · Building materials and conservation · Structural Analysis of Composite Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Fellow, ASCE,
Member, ASCE,
Prof. of Civ. Engrg. and Engrg. Mech., Univ. of Arizona, Tucson, AZ 85721.
Prof. of Civ. Engrg. and Engrg. Mech., Univ. of Arizona, Tucson, AZ.
Prof. of Civ. Engrg., Autonomous Univ. of Sinaloa, Mexico CP800000.
References (30)
Show source-provided references
1. Abboud B. E. Hamid A. A. and Harris H. G. (1990). “Small-scale modeling of concrete block masonry structures.” ACI Struct. J . 87(2).10.14359/3130 ↗
2. Abrams D. P. Angel R. and Uzanski J. (1993). “Transverse strength of damaged URM infills.” Proc. ASCE Struct. Congr . ASCE Reston Va.
3. Abrams D. P. and Costley A. C. (1996). “Seismic evaluation of unreinforced masonry buildings.” 11th World Conf. on Earthquake Engrg. Paper No. 976 .
4. Bennedetti D. and Benzoni G. M. (1984). “A numerical model for seismic analysis of masonry buildings: Experiments and correlations.” Earthquake Engrg. & Struct. Dyn . 12.10.1002/eqe.4290120608 ↗
5. Bhende D. and Ovadia D. (1994). “Out-of-plane strengthening scheme for reinforced masonry walls.” Concrete Int . April 30–34.
6. Bruneau M. (1994). “Seismic evaluation of unreinforced masonry buildings: A state-of-the-art report.” Can J. Civ. Engrg . Ottawa 21 512–539.10.1139/l94-054 ↗
7. Dawe J. L. and Seah C. K. (1989). “Out-of-plane of concrete masonry infilled panels.” Can J. Civ. Engrg . Ottawa 16 854–864.10.1139/l89-128 ↗
8. Deppe K. (1988). “The Whittier Narrows California earthquake of October 1 1987—Evaluation of strengthened unreinforced masonry in Los Angeles City.” Earthquake Spectra 4(1) 157–179.10.1193/1.1585470 ↗
9. Drysdale R. D. · 1994
10. Ehsani M. R. and Saadatmanesh H. (1994). “Out-of-plane strength of unreinforced brickwork retrofitted with fiber composites.” Proc. NCEER Workshop on Seismic Response of Masonry Infills National Center for Earthquake Engineering Research State University of New York at Buffalo.
11. Ehsani M. R. and Saadatmanesh H. (1996). “Seismic retrofitting of URM walls with fiber composites.” Masonry Soc. J . 14(2) 63–72.
12. Ehsani M. R. and Saadatmanesh H. (1997). “Fiber composites: An economical alternative for retrofitting earthquake-damaged precast-concrete walls.” Earthquake Spectra 13(2) 225–241.10.1193/1.1585943 ↗
13. Essaway A. M. ( 1986). “Strength of hallow Concrete block masonry walls subjected to lateral (out-of-plane) loading ” PhD thesis McMaster University Canada.
14. 10.1520/STP19608S10.1520/STP19608S ↗
15. Hamid A. A. Chia-Calabria C. and Harris G. H. (1992). “Flexural behavior of joint reinforced block masonry walls.” ACI Struct. J . 89(1) 20–26.10.14359/1279 ↗
16. Hendry A. W. (1973). “The lateral strength of unreinforced brickwork.” Struct. Engrg. J . 51 42–50.
17. Kehoe B. E. (1996). “Performance of retrofitted unreinforced masonry buildings.” 11th World Conf. on Earthquake Engrg. Paper No. 1417 .
18. Laursen P. T. Seible F. Hegemier G. A. and Innamorato D. ( 1995). “Seismic retrofit and repair of masonry walls with carbon overlays.” Non-metallic (FRP) reinforcement for concrete structures . Reunion Internationale des Laboratoires d'Essais et de Recherches sur les Materiaux et les Constructions.
19. Lester J. (1998). “Staking your claim.” Civ. Engrg . ASCE July 65–67.
20. Lizundia B. · 1997
21. “Methodology for mitigation of seismic hazard in existing unreinforced masonry buildings: Wall testing out-of-plane.” (1981). ABK-TR-04 . El Segundo Calif.
22. Schwegler G. (1995). “Masonry construction strengthened with fiber composites in seismically endangered zones.” 10th Eur. Conf. on Earthquake Engrg . 2299–2303.
23. Schwegler G. and Kelterborn P. (1996). “Earthquake resistance of masonry structures strengthened with fiber composites.” 11th World Conf. on Earthquake Engrg. Paper No. 1460.
24. Siegel H. I. and Fowler L. W. (1994). “Jackson Brewery: Upgrading historic unreinforced brick buildings.” Earthquake Spectra 10(1).10.1193/1.1585762 ↗
25. 10.1061/(ASCE)0733-9445(1991)117:7(2166)10.1061/(ASCE)0733-9445(1991)117:7(2166) ↗
26. Tobriner S. M. (1984). “At earthquakes: 1755–1907.” Earthquake Spectra 1(1) 125–149.10.1193/1.1585260 ↗
27. Tomazevic M. (1996). “Recent advances in earthquake-resistant design of masonry buildings: European prospective.” 11th World Conf. on Earthquake Engrg. Paper No. 2012 .
28. Velazquez-Dimas J. I. ( 1998). “Out-of-plane cyclic behavior of URM walls retrofitted with fiber composites ” PhD dissertation Department of Civil Engineering and Engineering Mechanics University of Arizona Tucson.
29. Velazquez-Dimas J. I. Ehsani M. R. and Saadatmanesh H. (1999). “Out-of-plane behavior of brick masonry walls strengthened with fiber composites.” Earthquake Spectra in press.
30. Weeks J. Seible F. Hegemier G. and Pristley M. J. N. (1994). “The U.S.-TCCMAR full-scale five-story masonry research building test.” University of California San Diego.