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

Key mechanism of defence by hot dip galvanizing, Question What is key m...

Question What is key mechanism of defence by hot dip galvanizing ? Answer Hot dip galvanizing protects steel or iron from corrosion by- (i) It figures a metallic z

Determine the grain exact gravity, (i) A dry soil has a void ratio of 0.65 ...

(i) A dry soil has a void ratio of 0.65 and its grain exact gravity is = 2.80. What is its unit weight? (ii) Water is added to the sample so that its degree of saturation is 60%

Determine the steps for routine inspection, Determine the Steps for routine...

Determine the Steps for routine inspection? A routine inspection should normally include: - A Level I inspection on 100% of the underwater portion of the structure to determ

Aggregate value, how to calibrate AGGREGATE IMPACT VALUE TESTING MACHINE

how to calibrate AGGREGATE IMPACT VALUE TESTING MACHINE

Define hydraulic tools for underwater inspection of bridge, Define Hydrauli...

Define Hydraulic tools for underwater inspection of bridge? Hydraulic tools involve grinders, rotary brushes and scrubbers. The benefits of hydraulic tools are the same as thos

Types of pavements, Types of Pavements: On the basis of structural pe...

Types of Pavements: On the basis of structural performance of pavements, there are basically two types of pavements: (a) Flexible, and (b) Rigid. A flexible pavement

Statics - SFD & BMD Calculations, Could someone please help me with the cal...

Could someone please help me with the calculations of determining the sfd & bmd for cantilevers with udl''s, lvl''s and point loads? Also could I please have the same for ssb with

Explain the term - circular prestressing, Explain the term - Circular Prest...

Explain the term - Circular Prestressing This term refers to the case when tendon profile is provided in a round shape, such as in water tanks and pipes, etc.

Measure the ultimate settlement due to pumping, A clay stratum of 18 metres...

A clay stratum of 18 metres thickness was found above a sand stratum when a boring was made. The clay was consolidated under the present overburden pressure. The hydrostatic pressu

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