Calculate the concrete flexural stresses at the mid-span and support sections at transfer and under final conditions

SKU: wufo63 Category:

Would using the minimum distance of x be the most practical solution?

 

Order Now

Q1:

The simply supported I beam shown below is used in a corrosive environment to carry a service load, comprising 3 kN/m dead load and 5 kN/m live load over the 13 m span, in addition to its own weight. Normal density concrete will be used. The beam is pre tensioned using 6 Size 13 (Grade 1860) horizontal strands jacked initially to 75% of ultimate as shown in the figure. The initial and total losses are 9% and 23% respectively, of jacking.

(a) Calculate the concrete flexural stresses at the mid-span and support sections at transfer and under final conditions.

 

(b) Compare stresses in (a) with relevant permissible values in A23.3-04 assuming fc ’ = 35 MPa and fci’ = 25 MPa

 

(c) Determine the maximum eccentricity of prestress that may be used so that no tensile stress is induced at the support section. (d) Use CONCISE to check your calculations and comment on any differences.

 

(d) Use CONCISE to check your calculations and comment on any differences.

cgs

300

 

Q2:

The normal density concrete beam shown below has a rectangular section 200 mm wide by 600 mm deep and contains 750 mm² of Grade 1860 prestressing steel having the indicated profile. The stress in the prestressing steel at transfer is 77% of ultimate and after losses the prestress force is 80% of that at transfer. The concrete strength at transfer is fci’ = 35 MPa and the specified strength is fc ’ = 38 MPa.

(a) Determine, according to stress serviceability requirements only, the uniformly distributed superimposed load that can be carried by the beam in a non-corrosive environment. Assume that 40% of this load is sustained loading.

 

(b) Determine the minimum value of distance x and the related hold down force.

 

(c) Would using the minimum distance of x be the most practical solution?

 

(d) Would it be possible to use a single harp point at mid-span assuming an eccentricity of 140 mm at mid-span and zero at the end of the beam? Show suitable calculations to justify your answer.

100

 

 
 

Writing your homework and assignments all on your own is a difficult task. So, Assignments4u has made it easy for students by helping them in writing their assignments. Assignments4u will assist you in completing your tasks, and you can approach us with all your assignment, homework, and essay writing requirements.

We have over 4350+ experienced writers working as experts in different streams of study. Get all your academic doubts clarified and take pride in learning subjects like history, math’s or law. Our assignment help and essay help is available in countries like USA, Australia, New Zealand, Singapore and many more. Get accounting assignment help, corporate nursing assignment help, marketing assignment help or else statistics assignment help in exchange for a nominal price.

Reviews

There are no reviews yet.

Be the first to review “Calculate the concrete flexural stresses at the mid-span and support sections at transfer and under final conditions”

Your email address will not be published. Required fields are marked *

Sorry no more offers available
close-link

When assignments gets tough, get tougher

Want a fresh solution like this one? 
We are available 24/7
ORDER NOW
0 Shares
Tweet
Pin
Share
+1
Call Back