Civil Engineering Reference
In-Depth Information
70
110
110
240
φ
8
2
2
bend
bend
φ
8
b
3@160
φ
1-1
(a)
(b)
(c)
floor plate
b
3@
160
φ
4
φ
8
in all
concrete key
1
1
100
h
1
addition foundation
original foundation
2-2
(e)
(d)
Fig. 4.3
Retrofit of brick wall by concrete buttress column.
120
open hoop
close hoop
50
original wall
bend
bend
1
1
1
(a)
(b)
1-1
Fig. 4.4
Retrofit of brick wall and pilaster by concrete.
4. Bearing-capacity checking for retrofitted wall with concrete buttress columns
Masonry after retrofitting by concrete buttress columns becomes composite masonry.
Considering that post-build concrete buttress columns are related with stress state of orig-
inal wall and existing stress lagging, strength reduction factor
α
should be introduced for
post-build concrete buttress columns when calculating bearing capacity of composite brick
masonry.
