Page 118 - Advanced Design Examples of Seismic Retrofit of Structures

110 Advanced Design Examples of Seismic Retrofit of Structures

1.24 0.88 1.8 2.03 2.03 1.75
1.53 1.85 1.76 0.71 1.76 1.94 1.75 0.42
1.29 1.67 1.23
0.57
1.1
0.47 0.91 1.29 0.14 0.12 0.16 0.38 0.88
0.52 0.45 0.54 0.17
0.27 0.61 0.73
0.2 0.71 0.57 0.53
0.63
1.21
0.47 0.91 1.72 0.78
5.57 5.71 5.571.95 1.18 3.07 3.14 2.46
2 2.48 2.24 0.94 0.93 0.94 1.65
(A)

0.53 0.59 1.1 1.11 1.11 1.06
0.92 1.01 1.02 0.4 1.02 1.01 1.06 0.18
1.29 1.69 0.86
0.65
0.92
0.67 1.06 1.05 0.34 0.26 0.3 0.38 1.02
0.67 0.42 0.7 0.39
0.45 0.53 0.84
0.36 0.7 0.42 0.69
0.68
1.35
1.07
0.67 1.06 1.08 0.79
1.2 1.41 1.20.88 0.69 1.78 1.75 1.51
0.88 0.97 0.96 0.42 0.98 1 0.93
(B)
FIG. 2.57 Plan of the vulnerable walls of the example partially shotcreted building with flexible
diaphragm having horizontal ties. (A) Floor story. (B) First story.

The failure mode and their DCR are also shown besides each wall. As can be
seen, the majority of the walls in the example building are not vulnerable in all
the considered cases thanks to adding a shotcrete layer on half of the walls. As
mentioned, the approach of not retrofitting all the vulnerable walls works best
for buildings with rigid diaphragms.

2.8.4.5 Construction Details
Some example details of shotcreting of URM walls are presented in Fig. 2.59.
For more information about the various possible details of shotcreting of URM
walls, the reader is referred to the Practical Instruction for Shotcrete Connection
in Seismic Rehabilitation of Schools [54].
(a) Connection of perpendicular walls from the external face.
(b) Connection of perpendicular walls from the internal face.