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
Question Will it worthwhile to take out tests on particle density of soil particles for geotechnical design? Answer Particle density of soils is definite by ratio of

Concrete surround is generally adopted for rigid drainage pipes to resist high traffic loads (for instance under shallow covers) and to allow for using pipes with lower strength. F

Define Vertical Curves  - Transportation 1) Vertical curves are used to change the grade of a highway. 2) Most vertical curves take the shape of an equal-tangent parabola.


closed traverse maths problems at list 5 station

Q. What are Service reservoirs? Service reservoirs, other than normal reservoirs are provided due to the subsequent reasons:  (i)  In case of breakdown of pumping stations a

how many rcc is use for 1 brass?

Using Matlab/ Simulink software to model the overall building fabric heat transmit characteristics, in order to estimate the maximum rate of heat loss (kW) from the building under

A clay layer 5 m thick has double drainage. It was consolidated under a load of 127.5 kN/m2. The load is enhanced to 197.5 kN/m 2 . The coefficient of volume compressibility is 5.7

Q. Define Well Steoning? It is the side wall of well foundation. It is built of masonry or cement concrete not less than M 10 grade, sufficient bond rods should be provided to