Page 283 - Advanced Design Examples of Seismic Retrofit of Structures

276 Advanced Design Examples of Seismic Retrofit of Structures

(A)
(B)

(C) (D)
FIG. 4.26 Examples of isolation of walls from the frame. (A) In a steel frame. (B) Using com-
pressed foam between the wall panels and the frame and brace members. (C) In an RC frame build-
ing during construction. (D) In an RC frame building after construction. (Permission from DRES.)

Also, all components shall have adequate strength to span between locations of
out-of-plane support when subjected to out-of-plane forces calculated using Eq.
(4.50), but not less than forces calculated using Eq. (4.51):
(4.50)
F p ¼ 0:4S XS χW p
F p,min ¼ 0:1χW p (4.51)
where F p ¼out-of-plane force per unit area for the analysis of a wall spanning
between two out-of-plane supports.
Fig. 4.25 shows the details of the anchoring the infill walls against out-of-
plane actions. Examples of isolation of walls from the frame are shown in
Fig. 4.26.

REFERENCES

[1] ASCE/SEI Seismic Rehabilitation Standards Committee, Seismic Rehabilitation of Existing
Buildings (ASCE/SEI 41-06), American Society of Civil Engineers, Reston, VA, 2007.