Seismic In-plane Performance of Retrofitted Masonry Walls

다국어 초록 (Multilingual Abstract)

Retrofitting of masonry to improve its seismic performance is the focus of research community all around the globe. In the present work, a new masonry retrofitting technique using externally anchored steel strips mesh is presented. An extensive experimental programme was carried out to study the effects of proposed technique on masonry lateral strength, ductility, energy dissipation,response and damping factor under lateral cyclic loading. A total of twenty tests were carried out; 1) twelve were lateral cyclic tests,2) four monotonic lateral tests and 3) four pure compression tests. The test results were analysed in five separate groups and this paper presents the analysis of group 3, which deals with the effect of steel retrofitting of un-reinforced masonry wall panels on its seismic performance. Six single leaf panels with aspect ratio of 0.67 were constructed using same type of material and workmanship.
It was observed that amount of steel reinforcement and meshing pattern of steel strips had significant effect on seismic performance and failure modes. The simplicity, cost effectiveness and efficacy of this proposed technique could help the local designers and engineers to enhance seismic performance of existing masonry structures.

참고문헌 (Reference)

1 Farooq, S. H., "Technique for strengthening of Masonry wall panels using Steel Strips" 7 (7): 621-638, 2006

2 Tumialan, G., "Strengthening of masonry walls by CFRP structural repointing" 1033-1042, 2001

3 Tinazzi, D., "Strengthening of masonry assemblages with CFRP rods and laminates" 411-418, 2000

4 ElGawady, M. A., "Static cyclic response of masonry walls retrofitted with fiber reinforced polymer" ASCE 10 (10): 2006

5 Matsumura, A., "Shear strength of reinforced masonry walls" 7 : 121-126, 1988

6 Matsumura, A., "Shear strength of reinforced hollow unit masonry walls" 50-1-50-16, 1987

7 Tomaževiè, M., "Seismic resistance of reinforced masonry walls, volume 2: Test results, part two" Institute for Testing and Research in Material and Structures 1987

8 Tomaževiè, M., "Seismic resistance of reinforced masonry walls, volume 1: Test results, part one" Institute for Testing and Research in Material and Structures 1986

9 Tomaževiè, M., "Seismic resistance of reinforced masonry walls" 6 : 97-102, 1988

10 Priestley, M. J. N., "Seismic resistance of reinforced concrete masonry shear walls with high steel percentages" 10 (10): 1-16, 1977

11 Matsumura, A., "Planar shear loading test on reinforced fully grouted hollow clay masonry walls" University of Illinois, Urbana-Champaign 347-356, 1990

12 ElGawady, M. A., "In-plane seismic response of unreinforced masonry walls upgraded with fiber reinforced polymer" ASCE 9 (9): 524-535, 2005

13 Haider, W., "Experimental study of monotonically loaded wide spaced reinforced masonry shear walls" 5 (5): 101-118, 2004

14 Shing, P. B., "Evaluation of shear strength of reinforced masonry walls" 12 (12): 65-77, 1993

15 Matsumura, A., "Effectiveness of shear reinforcement in concrete masonry walls"

16 Farooq, S. H., "Effect of horizontal reinforcement in strengthening of masonry members" 27 (27): 49-62, 2008

17 Muguruma, H., "Ductile behavior of high strength concrete columns confined by high strength transverse steel" 128-54 (128-54): 877-891, 1991

18 "Design of masonry structures"

19 Priestley, M. J. N., "Cyclic testing of heavily reinforced concrete masonry shear walls" Department of Civil Engineering, University of Canterbury 1976

20 Mayes, R. L., "Cyclic shear tests on masonry piers, Volume 1: Test Results" Earthquake Engineering Research Centre, University of California 1976

21 Mayes, R. L., "Cyclic shear tests of masonry piers, Volume 2" Earthquake Engineering Research Centre, University of California 1976

22 Ilyas, M., "Confinement of masonry using steel strips" UET Lahore 5 : 1-9, 2009

23 Ilyas, M., "Collapse of a building due to percolation of water from rooftop in old lahore" 41-44, 2005

24 ElGawady, M., "A review of retrofitting of URM walls using composites" 2004