Page 149 - Advanced Design Examples of Seismic Retrofit of Structures

Example of an RC Building Retrofitted by RC Shear Walls Chapter 3 141

0.45
0.40
Building diaphragm displacements, m 0.30
0.35

0.25
0.20
0.15
0.10
0.05
0.00
STORY9 STORY8 STORY7 STORY6 STORY5 STORY4 STORY3 STORY2 STORY1 STORY0 STORY-1 STORY-2
INT-X 0.17 0.16 0.13 0.11 0.11 0.09 0.07 0.05 0.03 0.02 0.01 0.00
S-X 0.14 0.13 0.14 0.12 0.13 0.10 0.08 0.05 0.03 0.02 0.01 0.00
N-X 0.41 0.26 0.21 0.18 0.14 0.11 0.08 0.06 0.04 0.02 0.01 0.00
(A)
0.45
0.40
Building diaphragm displacements, m 0.30
0.35

0.25

0.20
0.15
0.10
0.05
0.00
STORY9 STORY8 STORY7 STORY6 STORY5 STORY4 STORY3 STORY2 STORY1 STORY0 STORY-1 STORY-2
INT-Y 0.34 0.31 0.27 0.23 0.19 0.15 0.11 0.07 0.04 0.02 0.00 0.00
S-Y 0.29 0.28 0.24 0.20 0.17 0.13 0.10 0.07 0.04 0.02 0.01 0.00
N-Y 0.45 0.42 0.37 0.32 0.26 0.21 0.16 0.11 0.06 0.03 0.00 0.00
(B)
FIG. 3.15 Lateral displacements of stories of two loading directions under critical loading com-
bination. (A) X-direction. (B) Y-direction.

3.3.2.4 Retrofit solutions
Based on the results in previous parts, the main approach in the design of the
retrofit method is towards:
– proper connection of the two northern and southern parts of the building;
– reduction of the stiffness of the northern RC shear walls in both of the build-
ing parts; and