Page 187 - Advanced Design Examples of Seismic Retrofit of Structures

Example of an RC Building Retrofitted by RC Shear Walls Chapter 3 179

Q UD
1 (3.14)
2κmQ c
where Q c ¼ ultimate capacity of soil.
The expected capacity of the foundation is calculated according to Eq. (3.15):

(3.15)
q c ¼ 3q a
Based on the geotechnical consultant recommendation, the allowable capac-
ity of the soil is q a ¼0.35 MPa. We have:

q c ¼ 3q a ¼ 3 0:35 ¼ 1:05MPa
Because the m-factor of 4.0 in the CP performance level has been included
in the demand forces, we have:

Q UD
1 ! Q UD 2Q c ¼ 2 1:05 ¼ 2:1 MPa
2 1 Q c
The maximum stresses from the envelop of the results of the deformation-
controlled loads combinations shown in Fig. 3.41 is 1.83MPa, which is smaller
than the calculated capacity.

0.0
–1.5
–3.0
–4.5
–6.0
–7.5
–9.0
–10.5
–12.0
–13.5
–15.0
–16.5
–18.0
–19.5

FIG. 3.41 The stresses in the soil ( 10 1 MPa).