Page 91 - Advanced Design Examples of Seismic Retrofit of Structures

Example of a Two-Story Unreinforced Masonry Building Chapter 2 83

1.86 R 1.29 B 1.23 R 1.13 R 1.13 R 1.99 R
2.15 R 1.19 R 1.22 R 1.24 R 1.22 R 1.22 T 1.77 R 0.61
1.1 B 1.36 T 3.34 T
1.59 B
1.28 B 2.46 T 2.46 T 2.04 T 0.38 0.88 1.59 B
0.33 0.29
0.77 0.85 0.83 0.44
0.42 0.95 0.79
0.39 0.85 0.85 0.8
1.74 B
1.18 B
1.28 B
2.46 T 2.46 T 1.3 B
6.9 R 4.57 R 6.9 R2.8 R 1.71 R 1.67 R 1.64 R 2.9 R
2.14 R 1.18 R 1.24 R 1.21 R 1.2 R 1.21 R 2.14 R
(A)
0.96 1.09 B 0.67 0.89 0.89 1.03 R
1.13 R 0.98 0.9 0.87 0.9 1.05 B 0.85 0.36
1.28 B 1.68 B 1.88 B
1.4 B
2.06 B
2.36 B 2.36 B
1.43 B 0.73 0.55 0.65 0.8 1.28 B
0.81 0.81 0.8 0.79
0.73 0.85 0.83
0.71 0.81 0.81 0.82
1.42 B
3.87 B
1.06 B
1.43 B
2.36 B 2.36 B 1.2 B
2.34 R 2.74 R 2.341 R 64 R 1.34 B 1.42 B 1.51 B 1.7 R
1.11 R 0.97 0.84 0.9 0.92 0.9 1.1 R
(B)
FIG. 2.40 Plan of the vulnerable walls of the example building with a flexible diaphragm having
horizontal ties. (A) Floor story. (B) First story.

- For a rigid diaphragm:
f UD
DCR b ¼
m b V bjs
8463
DCR b ¼ ¼ 0:33
3 8493
f UD
DCR r ¼
m r V r
8463
DCR r ¼ ¼ 0:95
1:55 5726
f UF
DCR d ¼
V dt
3005
DCR d ¼ ¼ 0:31
9549