Assignment Task:
Reinforced Concrete Design Project Engineering Assignment Help

Stage 1 – Loading and Beam Design
You are to design the two beams A1 – C1 and B1 – B3 indicated on the floor plan below.

Use f’c = 32 MPa – unless your group decides there is a valid reason for doing otherwise.
You may assume, at this stage, 300mm x 300mm square columns and a 250mm deep slab.
State any other assumptions required and show all relevant working clearly. Consider only the durability requirement when determining cover (ie not fire requirement).

a) Determine the loading on your beams and show all loads and reactions clearly on a diagram for each beam.

b) Design your beams for the following:

1) Strength limit state in flexure and shear (using ERSB from first principles for flexure). Check the ductility of your cross-
sections.

2) Check serviceability of total deflection in terms of the ‘deemed to comply’ requirements of Cl 8.5.4. If your cross-sections from
part

(a) are inadequate, redesign the beams. If you redesign the beams, check the ductility of the new cross-sections.

3) Check if the proposed sections are adequate using the simplified (!) calculation method of Cl. 8.5.3 (do NOT use the further simplification for Ief at the end of Cl 8.5.3.1). Redesign  the beams and recheck ductility if necessary.

4) Determine the shear reinforcement required. Use R10 double- legged stirrups.

5) Draw a side elevation and cross-section of your beams showing

a realistic layout and positioning of reinforcing steel.

 

Stage 2 – Slab Design
For the floor layout for your structure, as per the beam design assignment, you are to compare a two-way slab design to a flat slab design. The superimposed dead load does not include brittle partitions or any other special requirement to limit deflection. Assume that the slab is restrained against expansion/contraction due to shrinkage or thermal effects – only minor degree of control over cracking is desired. State any other assumptions required and show all relevant working clearly For the two-way slab design:

  •  Determine the thinnest slab thickness to the nearest 10mm (round up) based on the ‘deemed to comply’ requirement
  •  Show the design bending moments M* on a plan
  •  Determine the reinforcement required and show this on separate plans for top and bottom steel. Indicate the order in which steel is to be placed.

 

For the flat slab design:
Assume the columns do not have drop panels

 Determine the thinnest (rational) slab thickness required based on the ‘deemed to comply’ provisions.

 Calculate Mo for each span (ie. edge design strip and interior design strip in both long and short span directions) assuming a slab thickness of 250mm. Show clearly on a sketch the moments per metre width for interior column, exterior column and middle strips.

 Calculate the amount of steel reinforcement required to satisfy strength (ie. Mo) as well as the minimum steel required by AS3600 based on a slab thickness of 250mm. Show the reinforcement on separate plan layouts for top and bottom steel.

 Check punching shear for the first interior column in the critical interior design strip based on a slab thickness of 250mm. Should drop panels be provided? Which floor system ie two-way slab or flat slab would you use in your structure? Justify your answer in terms of slab thickness, reinforcement required etc.

Stage 3 – Column Design
In this stage of the project you are to design the central column in your given floor plan. Assume this floor is the first floor below the roof level and that the weight of the roof is the same as the weight of your floor. The centre-to-centre length of the column is 3000mm. Take the initial column size as 400 x 400mm and use the column interaction diagrams at In this stage of the project you are to design the central column in your given floor plan. Assume this floor is the first floor below the roof level and that the weight of the roof is the same as the weight of your floor. The centre-to- centre length of the column is 3000mm. Take the initial column size as 400 x 400mm and use the column interaction diagrams at:

You may wish to increase f’c to 40 MPa for this part of the project.
State any assumptions required and show all relevant working clearly.

1. Using moments and reactions from your two way slab design:
a) Determine N*, M*x.max and M*y.max.

b) Determine the longitudinal reinforcement to safely support N* and
M*x.max. Show this reinforcement on a cross-section of your column.

c) Check that the cross-section you have designed will safely support N*, M*x.max and M*y.max. Use Cl. 10.6.5 of HB2.2 (also Equation 5.20 p. 261 of the textbook) to check this. Determine the longitudinal reinforcement for this biaxial bending case if the steel required in part

(b) is not sufficient.

 

2. Using moments and reactions from your flat slab design:

a) Determine N*, M*x.max and M*y.max.

b) Determine the longitudinal reinforcement to safely support N* and M*x.max. Show this reinforcement on a cross-section of your column.

c) Check that the cross-section you have designed will safely support N*, M*x.max and M*y.max. Use Cl. 10.6.5 of HB2.2 (also Equation 5.20 p. 261 of the textbook) to check this. Determine the longitudinal reinforcement for this biaxial bending case if the steel required in part
(b) is not sufficient.

3. Briefly comment on the difference in reinforcement required in the column between the two slab systems.

 

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  • Posted on : December 03rd, 2018

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