F. K. Kong MA, MSc, PhD, CEng, FICE, FIStructE, R. H. Evans CBE, DSc, D ès Sc, DTech, PhD, CEng, FICE, FIMechE, FIStructE (auth.)-Reinforced and Prestressed Concrete-Springer US (1987)

7000
f = 460 N/mm 2
y
Loads-including that due to self-mass 403
p p'
b
% % d
N/mm 2 3·5 1·5 0·67
feu= 40
6000 3·5 0·5 0•67
E 5000 z
.:&:
~
d'
-=
d
0·15 2·5 1·0 0·67
2·5 0 0·67
2·0 0 0·67
Cll 4000
u
c
-.!!!
Ill
3·5 0·5 0·33
Cll
... 3000
2·5 1·0 0·33
0 2·5 0 0·33
c 2000 2·0 0 0·33
Cll
E
0
~
1000
1·0 0 0·33
0 200 400 600 800 1000
Effective depth d (mm)
0·15 0 0·33
Fig. 11.2-1 Relation between resistance moment and effective depth-rectangular
beams
not exceed 15, so that the column satisfies BS 8110's definition of a 'short
column'. The effective height is defined by eqn (7.2-2), but it is simplest
at this stage to take it as the clear height from floor to ceiling.
Step 7 Ultimate load of columns
Further assistance in the selection of the size of a column is given in
Table 11.2-1, where the ultimate loads have been calculated from eqn
(3.4-2) for short columns.
Imposed loads
These include those due to stored solid materials and liquids, people,
natural phenomena in addition to those due to moving vehicles and
equipment [4, 6, 9]. Some examples are given in Table 11.2-2. As was
discussed in Section 1.5, the student must recognize that the most severe