Civil Engineering Reference
In-Depth Information
Checking
Designing
Section
Length and loading
Analysis for
N
Ed
Table or graph
Initial values
f
y
(= nom.)
A
eff
(=
A
)
Find
L
cr
(= 0.5)
Find section
N
b,Rd
N
Ed
≥
Trial section
Find
f
y
, A
eff
Find section
A
N
Ed
/( ×
f
y
)
≥
Find ,
Find
Modify
to hasten
convergence
Compression resistance
N
b,Rd
=
A
eff
f
y
/
M
1
No
Check if
N
Ed
N
b,Rd
≤
Yes
No
Test convergence
Yes
Check
complete
Design
complete
Figure 3.14
Flow chart for the design of compression members.
3.6 Restrained compression members
3.6.1 Simple supports and rigid restraints
In the previous sections it was assumed that the compression member was sup-
portedonlyatitsends, asshowninFigure3.15a. Ifthememberhasanadditional
lateral support which prevents it from deflecting at its centre so that
(
v
)
L
/
2
=
0,
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