Reinforced concrete bridges - Computational Analysis and Design of Bridge Structures - page 126

6

4

2

Run1 (1 mph) 3215
Run3 (5 mph) 3215
Run7 (1 mph) 3215

0

Model 3215

Run1 (1 mph) 1641
Run3 (5 mph) 1641
Run7 (1 mph) 1641
Model 1641

−2

−4

−6

−8

0 5 10 15

Normalized time

20 25 30

Figure 4.20 Strain transducer nos. 3215 and 1641 parallel to the slabs on the bottom
surface of beam 7.

Post-tensioning force of rods (kN)

0 50 100 150 200 250 300 350 400 450 500

0

−1

−2

−3

−4

−5

−6

−7

−8

−9

Beam 1
Beam 2
Beam 3
Beam 4

−10

−11

−12

−13

Figure 4.21 Displacements at midspan for different transverse post-tensioning forces.

Then, a second-stage parametric study on the orientation of the tendons
was conducted (Fu et al. 2012) on skewed bridges. In Figure 4.22, transverse
stress contour between concrete overlay and precast beam interface for a
7.6 m, 30° skewed bridge is shown. For comparison purpose, two types of
tendon arrangement were studied. On Figure 4.22a, third points with skewed
tendon parallel to the support are post-tensioned. On Figure 4.22b, four