Civil Engineering Reference
In-Depth Information
analysis, the “tendon modeling through primary moments” as discussed
in Section 5.2.1 is used in the calculation by Merlin-DASH/PBEAM, a 2D
line girder program. This tedious procedure of generating primary fixed-
end moments can also be employed to a generic finite element analysis pack-
age, but the process would be cumbersome. Results show that the program
checks stress limits of the concrete (Figure 5.16) and the reinforcing steel
under the serviceability limit states as well as ultimate moments and shears
under the strength limit states.
Girder top stresses at service
1.0
0.5
0.0
−0.5
Prestress
Total with
+
(LL
+
I)
Total with
−
(LL
+
I)
Allowable tension
Allowable compression
−1.0
−1.5
−2.0
−2.5
−3.0
0
65
130 195
Distance (feet)
260
325
(a)
Girder bottom stresses at service
1.0
0.5
0.0
−0.5
Prestress
Total with
+
(LL
+
I)
Total with
−
(LL
+
I)
Allowable tension
Allowable compression
−1.0
−1.5
−2.0
−2.5
−3.0
0
65
130 195
Distance (feet)
260
325
(b)
Figure 5.16
(a) Top and (b) bottom stresses of a five-span precast, prestressed concrete
bridge.
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