Continuous prestressed concrete beam design , Civil Engineering

Assignment:-Continuous Prestressed Concrete Beam Design

A cast in-place 3-span prestressed concrete T-beam is to be designed. The T-beam concsists of an 8-in thick reinforced concrete deck slab integrally cast onto rectangular girders that have webs 48-in deep by 15-in wide. The spans are to be 90,, 120, 90 ft.
Adopt the following properties:
-f’c = 6ksi
-fpu=270ksi, dt=0.5in
-k=0.005/ft, mu=0.2. Up to 19 tendons can be bundled into a 3.0-in dia. duct.

Design:

1.    One T-girder to balance self-weight, where the slab is 8-ft wide.
2.    Use end-to end continuous prestress, with a load balancing approach. Attempt to minimize the tendon force by maximizing the drape. Balance as closely as practicable the dead load only by assuming 15% time-dependent losses.
3.    Check stresses and losses. For this, draw stress-blocks at critical locations of maximum positive and negative moments in each soan.
4.    Determine the ultimate moment capacity of the designed section at key positive negative and positive moment locations.

5.    Determine the maximum uniformly distributed live load that can be carried over the span based on achieving U=1.2D + 1.6L

-Service load conditions. For this check allowable stresses, including temperature stress effects as per AAASHTO and also deflection limits (L/800).
-Ultimate load conditions without moment-redistributuion (an elastic solution).
-Ultimate load with moment redistribution permitted. Note you may need to add additional mild steel at the interior support regions to improve section ductility.

6. Based on the resulting shear force distribution, design the shear reinforcement.

Posted Date: 2/14/2013 2:58:00 AM | Location : United States







Related Discussions:- Continuous prestressed concrete beam design , Assignment Help, Ask Question on Continuous prestressed concrete beam design , Get Answer, Expert's Help, Continuous prestressed concrete beam design Discussions

Write discussion on Continuous prestressed concrete beam design
Your posts are moderated
Related Questions
Shrinkage of concrete in prestressed members The shrinkage of concrete in prestressed members results in a shortening of ensioned wires and hence contributes to the loss of st

I need some help sizing a rectangular plate that will distribute my load to the simply supported beams below.

construction of arches

what is snowcem?

Compare brick masonry versus stone masonry advantage and disadvantage? Ans.- Comparison between Stone masonry and Brick masonry- Stone masonry Bri

Q. Show the Grout curtain around excavation? When excavation work is performed in grounds with highly permeable soils, other than installation of well points to lower down grou

how many scale are there and what are they use

Define Limitations of Underwater Magnetic Particle Testing? As with any non-destructive test method, UWMT has some limitations as under: i. Underwater magnetic particle tes

Question For drained reclamation, what will significance of smear zone bring by installation of band drains ? Answer Throughout installation of band drains, smear zon

WHAT ARE THE ADVANTAGES AND DISADVANTAGES OF TIMBER FOR CIVIL ENGINEERING