Reinforced concrete bridges - Computational Analysis and Design of Bridge Structures - page 121

Single-beam modeling

Figure 4.15 T-beam bridge computer rendering by Merlin-DASH.

0 1 .

0 6 . 0 2 .

S S

L

K

+

g

0 075 . (4.6a)

3

9 5 . 12 0 . Lt

s

where:
S is the spacing of the beam in feet (6.52′ or 2.0 m in this case)
L is the span of the beam in feet (26′ or 7.9 m in this case)
t s is the depth of concrete slab in inches (6″ for the flange thickness or
152 mm in this case)
K g is the longitudinal stiffness parameters in in 4 (calculated as
98,280 in 4 or 4.09 × 10 10 mm 4 in this case)
n is the modulus ratio between the beam and deck
I is the moment of inertia of the beam
e g is the distance between the centers of gravity of the beam and deck

2

(4.6b)

K = n I Ae ( +

g g

The second model as shown in Figure 4.16 is a more sophisticated finite
element model with the whole bridge modeled by CSiBridge. The concrete
beam and deck are modeled with shell elements. The abutment is frame ele-
ments. The abutment is fixed at the bottom.