Document Type: FAQ Product(s): LEAP CONSPAN/Precast/Prestressed Girder Version(s): All Original Author: Bentley Technical Support Group -VM
Document Type: FAQ
Product(s): LEAP CONSPAN/Precast/Prestressed Girder
Version(s): All
Original Author: Bentley Technical Support Group -VM
ANSWER:
A single Span bridge with 6 girders were considered for this design.
In the Design TAB only Design lane and Design Truck option was selected.
After Running the Analysis the program was showing a LL+I:Vmax value of 26.3 kips at the mid span for Service III load combination.
From Analysis TAB --> Load Case --> Beam 1 --> Design Lane - Max Shear , Fy = 4.68 kips at mid span.
From Analysis TAB --> Load Case --> Beam 1 --> Design Truck- Max Shear , Fy = 24.51 kips at mid span.
Just to add a note in Conspan Lane Loads are analyzed by loading only those parts of the bridge that would cause a maximum moment or shear at each section.
Calculation :
Span 1 Beam 1
Live Load Factor = 0.8
Distribution Factor = I loaded Lane = 0.882353
Impact factor for Design Truck = 1.33
Impact Factor for Design Lane = 0.00
Total Max Shear = Design truck + Design lane
LL+I : V max = (24.51 x 0.8 x 0.882353 x 1.33) + (8.68 x 0.8 x 0.882353) = 26.3 kips which matches Conspan results
Please see the attached screenshots for more information.