Page 170 - Advanced Design Examples of Seismic Retrofit of Structures

162 Advanced Design Examples of Seismic Retrofit of Structures

10,000
0 Degree
90 Degree
5000 180 Degree
270 Degree
Axial force, kN –10,000
0
–5000

–15,000

–20,000
–40,000 –30,000 –20,000 –10,000 0 10,000 20,000 30,000 40,000
Flexural moment, kN.m
FIG. 3.23 P-M interaction curves for shear wall P1 at story 2.

(B) Forces and moments based on the lower-bound values of concrete and steel
for force-controlled actions.
P UF (ton) V UF x (ton) V UF y (ton) T (ton. m) M UF x (ton. m) M UF y (ton. m)
319 164 92 373 6938 664

(C) Development of the axial force-flexural moment interaction curves
(see Fig. 3.23).
(D) Determination of the expected value of flexural capacity.
0 degree 90 degree 180 degree 270 degree
M CE x M CE y M CE x M CE y
(kN m) (kN m) (kN m) (kN m)
15758 8213 9358 9358

(E) Determination of the shear force per length, shear for each story, and the
m-factors.

q(kN)
0 degree 180 degree 90 degree 270 degree
6 7 44 578
(kN) (kN)
V UF x V UF y
0 degree 180 degree 90 degree 270 degree
250 316 145 6
m-factor
0 degree 180 degree 90 degree 270 degree
2.5 2.5 4.0 4.0