Prestressed/post-tensioned concrete bridges - Computational Analysis and Design of Bridge Structures - page 161

Figure 5.37 All displacements in the beam based on AASHTO, US23043 Bridge model 1.

1 2 3 4

86.9 m 137.2 m 86.9 m

18.3 m 18.3 m

7.32 m

2.74 m

2.74 m

2.74 m

15.54 m

(a)

0.61 m 0.23 m

0.23 m 0.61 m

0.23 m

1.07 m

1.07 m

(b)

Side-span approach

18.3 m C L

1 2 3 4 5 6

7 8 9 10 11 12 13 22

23 24

34 35 36 37 38 39 40

14 15 16 28 29 30 31 32 33

17 18 19 21 25 26 27

20

Center-span closure

Side-span closure

1

(c) Pier

Figure 5.38 (a) Bridge elevation profile, (b) bottom slab thickness variation, and (c) seg-
ment division.

The haunched girder is cantilevered from the piers using cast-in-place segments
and is later made continuous with short, conventionally erected, cast-in-place
segments near the abutments and with the adjoining cantilevered girder at
midspan. Each cantilever segment is post-tensioned to the previous segments
with several cantilever tendons. After the closures at the abutments and at
midspan, the entire bridge is prestressed with several additional continuity
tendons, extending the full length of the bridge. In this example, there is no