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

What are some facts about concrete, Actually, drying is not directly linked...

Actually, drying is not directly linked to hardness in concrete. After concrete is poured, putting it in a wet environment by spraying it constantly with water will hasten its hard

What is the withdrawal force of steel nails, In engineering, the code-allow...

In engineering, the code-allowable withdrawal force is zero, due to the wood expands and contracts over time and the nail pullout force can decrease to zero

Closing and opening of expansion joints and contraction join, Question ...

Question In case of for unreinforced concrete carriageway, what will succession of closing and opening of expansion joints and contraction joints? Answer Take a case t

Difference between road gullies and catch pits, Q. Difference between road ...

Q. Difference between road gullies and catch pits? Both road gullies and catchpits are the two fundamental types of drainage inlets of drainage system. However they are designe

Elongation, Elongation of bar due to self weight

Elongation of bar due to self weight

Functions of bedding below storm water drains, Question What are main funct...

Question What are main functions of bedding below storm water drains ? Answer Bedding that is normally made of granular resources or concrete serves four main functions as optio

How to determine the water content and bulk density, The wet weight of a sa...

The wet weight of a sample is missing in a Proctor test. The oven-dry weight of this sample is 189 N. The volume of the mould used is 1000 cm 3 . If the degree of saturation of

Building construction drawings, I need a drawing detail of expansion joints...

I need a drawing detail of expansion joints in building and different sizes

Explain the soil texture and soil structure, (a) Explain the 'Soil Texture'...

(a) Explain the 'Soil Texture' and 'Soil structure'. What are the various terms used to explain the above properties of the soil? (b) A clay sample having natural moisture conte

Retaining wall, I retained the soil in my yard by brick with 3 levels to a...

I retained the soil in my yard by brick with 3 levels to avoid sliding the soil to the street. the appeared part of the bricks from each level is 3 feet and less.The hidden part o

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