Civil Engineering Reference
In-Depth Information
beam is one-third of the total torsional inertia. This distribution is used for
the three different cross sections along the bridge axis.
To simulate the transverse flexural rigidity, the section properties of the
virtual connections are calculated according to Bakht and Jaeger (1985),
where the following equations are given for cellular structures:
D
=
0 5
. *
E t H
* *
2
(5.1)
y
c
D
Gc t H
2
yx
=
* *
(5.2)
where:
D
y
is the transverse flexural rigidity
D
yx
is the transverse torsional rigidity
t
is the thickness of top and bottom flanges
H
is the height between the centerline of both flanges
The acting forces are also distributed to the three beams. The structural
weight is divided according to the axial areas. The tendon forces are easily
distinguished, because they are located in the webs. The sequence of the
construction stages and their loads are the same as those in Model 4.
5.4.3 Verzasca 2 Bridge analysis results
The vertical bending moments in the beam along the bridge axis are shown
as results. All the results are given in kN-m. To simplify the discussions in
this section, the spans are still counted from left to right, span 1 between
abutment A and pier 1 and span 6 between pier 5 and abutment B.
5.4.3.1
Model 1: Continuous girder with constant
cross section
The vertical moments of this simple model (Figure 5.24) serve as starting
points for the discussion of the results of the next models. Model 1 is built
in one single stage and has a uniform dead load of 219.3 kN/m acting on
the entire structure. The moments are distributed according to the span
lengths.
−28625
−23599
−18898
−10472
−3347
−26778
−22107
−25850
−19355
−15492
−3624
−12992
−12983
−10864
−10014
−3552
−8285
−6015
−6004
−5173
−3521
−3674
−2310
−306
−1203
−420
0
3084
8430
4498
5532
6997
6802
6149
5517
7204
9687
8498
10568
11701
12756
15966
18909
Figure 5.24
Moment distribution, Verzasca 2 Bridge model 1.
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