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

Magnitude of torque - bending moment, Magnitude of torque - bending moment:...

Magnitude of torque - bending moment: A prismatic bar of hollow circular cross-section along with outer and inner diameters 100 mm and 80 mm correspondingly, carries a bending

Designing considerations for dowel bars, Question What are designing c...

Question What are designing considerations for dowel bars in joints of concrete carriageway? Answer Behaviour of dowel bars resembles that of piles in soils subject

On-line storage vs. off-line storage, On-line storage vs. off-line storage ...

On-line storage vs. off-line storage Design of storage pond is commonly divided into off -line storage and on-line storage. The on-line storage concept includes inclusion of s

Define recommendations for ptfe, Define Recommendations for PTFE? (a) I...

Define Recommendations for PTFE? (a) It can be either of the two forms given below: (i) Dimpled large sheet It may be circular or rectangular divided maximum into four pa

Pre-stressing work, Under which situation shall engineers use jacking in ag...

Under which situation shall engineers use jacking in agreement end only and from both ends in pre-stressing work?

Analyse and evaluate lightning strikes, Carry out research to Analyse and E...

Carry out research to Analyse and Evaluate: a.   The potential problems that lightning strikes to an aircraft in flight could create. b.   How design features and maintenance

What are the causes of building collapse, The Passage of time is single rea...

The Passage of time is single reason. Buildings also collapse because of weak foundations. Earthquakes, hurricanes and other natural disasters can also damage the structure of the

Determine the weight of solids mixed in the suspension, In a hydrometer ana...

In a hydrometer analysis, the corrected hydrometer reading in a 1000 ml uniform soil suspension at the start of sedimentation was 28. After a lapse of 30 minutes, the corrected hyd

Advance structure engg, need help for assignment that requires strand 7 and...

need help for assignment that requires strand 7 and autocad

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