Continuous prestressed concrete beam design , Civil Engineering

Assignment Help:

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.


Related Discussions:- Continuous prestressed concrete beam design

Darwing, construction the ellips in all method

construction the ellips in all method

Chemical classification of stones, Chemical Classification On the basis...

Chemical Classification On the basis of their chemical composition engineers prefer to classify  rocks as: 1.    Silicious rocks 2.    Argillaceous rocks 3.    Calcare

Loss of prestress due to elastic shortening of concrete, Loss of Prestress ...

Loss of Prestress due to Elastic Shortening of Concrete Due to elastic shortening of  concrete, tendons are able to reduce their stretched length to the same extent upto which

Surveying, why we perform survey work from whole to the part?

why we perform survey work from whole to the part?

Survey, what is road survey ?

what is road survey ?

Local vehicle parapet strong enough to contain vehicles, Q. Local vehicle p...

Q. Local vehicle parapet strong enough to contain vehicles? Majority of local parapets are 1.1m high in addition they are designed to resist impact from a 1.5ton car moving at

Calculation of deformation, Calculation of deformation For calculation ...

Calculation of deformation For calculation of deformation at some stage before the total creep is reached,  it may be assumed that about half the total creep takes place  in  f

Rectangular tie, using an optical square how would you perform a rectangula...

using an optical square how would you perform a rectangular tie?

Define the pump and motor efficiencies - hydrolic system, Define the Pump a...

Define the Pump and Motor Efficiencies Equations account for the loss of power, primarily due to mechanical friction as a result of rotating components in the pump and motor.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd