5350

Design a 25m span simply supported post tensioned bridge girder, the cross section of which is shown below: The girder supports a permanent load (G) of 27.5 kN/m and an imposed (Q) load of 25kN/m. It can be designed as a fully or partially prestressed member. Allocated mark for: (1) prestress force calculation: 20%, (2) stress checks: 10% and (3) ultimate capacity 15%. The design properties of the girder can be assumed as follows: ? Characteristic compressive strength of concrete at 28 days (fc’) = 50MPa ? Characteristic compressive strength of concrete at transfer fcp = 40MPa ? Breaking strength of prestressing steel (fpb) = 1870MPa ? Initial losses at mid-span = 12% ? Long term losses at mid-span = 20% ? Clear cover to duct = 65mm ? Duct diameter = 70mm

Attachments:

jk.PNG

Save your time - order a paper!

Get your paper written from scratch within the tight deadline. Our service is a reliable solution to all your troubles. Place an order on any task and we will take care of it. You won’t have to worry about the quality and deadlines

Order Paper Now