Civil Engineering Reference
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Example 5.2 Steel bridge frame with concrete deck: effects of
shrinkage
The bridge frame in Fig. 5.8(a) has a composite section for part AD
(Fig. 5.8(b) ) and a steel section for the columns BE and CF. It is
required to
nd the changes in the reactions and in the stress distribu-
tion in the cross-section at G due to uniform shrinkage of deck slab
occurring during a period
t
0
to
t
1
.
The cross-section properties of members are: for columns BE and
CF, area
fi
20 000 mm
2
(31 in
2
) and moment of inertia about an axis
through centroid
=
=
0.012 m
4
(29 000 in
4
); for part AD, the steel
Figure 5.8
Analysis of statically indeterminate forces caused by creep and shrinkage
in a composite frame (Examples 5.2 and 5.3): (a) frame dimensions;
(b) cross-section properties for part AD; (c) location of centroid of
ag
e-adjusted transformed section composed of area of concrete plus
times area of steel.
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