Civil Engineering Reference
In-Depth Information
Figure 2.15
Analysis of strain and stress in a pre-tensioned section (Example 2.6):
(a) cross-section dimensions; (b) strain and stress at
t
0
; (c) strain and
stress at
t
.
A
=
1158 in
2
;
B
=
19 819 in
3
;
I
=
547 200 in
4
.
Substitution in Equations (2.19) and (2.17) gives (Fig. 2.15(b) ):
∆
ε
O
(
t
0
)
=−
154×10
−6
;
∆
ψ
(
t
0
)
=
0.562 × 10
−6
in
−1
{
∆
σ
c
(
t
0
)}
top, bot
=
{
−
0.553,
−
0.472} ksi.
Search WWH ::
Custom Search