Civil Engineering Reference
In-Depth Information
Figure 9.4
Beam of Examples 9.1, 9.2 and 9.3.
bh
3
0.3 × (0.65)
3
12
I
g
=
12
=
=
6.866 × 10
−3
m
4
.
Basic de
fl
ection
5
ql
4
E
c
(
t
0
)
I
g
5
17×10
3
×8
4
30×10
9
× 6.866 × 10
−3
D
c
=
384
=
384
=
4.40 mm.
cients can be read from the graphs in
Figs F.1, F.2, F.4, F.7, F.9 and F.10 (or by Equations (F.1-3) ):
The following curvature coe
κ
s1
=
0.92
κ
φ
1
=
0.79
κ
cs1
=
0.27
κ
s2
=
3.80
κ
φ
2
=
0.14
κ
cs2
=
0.97
Instantaneous de
fl
ections in states 1 and 2 (Equations (9.5) and (9.6) )
D
1
(
t
0
)
=
0.92 × 4.40
=
4.05 mm
D
2
(
t
0
)
=
3.80 × 4.40
=
16.72 mm.
Changes in de
fl
ections in the two states due to creep (Equations (9.7)
and (9.8) ) are
(
∆
D
1
)
φ
=
4.05 × 2.5 × 0.79
=
8.00 mm
(
∆
D
2
)
φ
=
16.72 × 2.5 × 0.14
=
5.85 mm.
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