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Structural Design > Reinforced Concrete Beam Design > Flashcards

Reinforced Concrete Beam Design Flashcards

1
Q

What is Fck?

A

Compressive strength of concrete (cylinder)

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2
Q

What is Fyk?

A

Characteristic yield strength of reinforcement

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3
Q

What is b?

A

Breadth of beam

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4
Q

What is h?

A

Overall depth of beam

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5
Q

What is d?

A

Effective depth of beam

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6
Q

What is effective depth?

A

Depth to centroid of tension reinforcement

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7
Q

What is As?

A

Area of tension steel

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8
Q

What is the partial factor of safety for dead loads?

A

1.35

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9
Q

What is the partial factor of safety for live loads?

A

1.50

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10
Q

How is design load per metre of a beam calculated?

A

(1.35 x Total dead Load/m) + (1.50 x Total live load/m)

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11
Q

What is total dead load?

A

The characteristic dead load + beams self weight

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12
Q

How is maximum shear force calculated?

A

Design ultimate load and effective span are used within the shear force equation

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13
Q

How is maximum bending moment calculated?

A

Ultimate design load and effective span are used in the bending moment calculation

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14
Q

What is effective span?

A

The smaller value between:

Distance between CL of supports

And

Clear span + Total depth

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15
Q

What is step one in calculating longitudinal reinforcement?

A

Calculate k factor

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16
Q

What value must k not exceed?

A

0.167

17
Q

What is step 2 in calculating the area of longitudinal reinforcement?

A

Find z/d

18
Q

What is step 3 in calculating longitudinal reinforcement?

A

Find Z

Z = d x (z/d)

19
Q

What is step 4 in calculating longitudinal reinforcement?

A

Find As

20
Q

What is step 5 in calculating longitudinal reinforcement?

A

Check As exceeds min percentage required

21
Q

What is step 6 in calculating longitudinal reinforcement?

A

Choose reinforcing bars that give a reinforcement of at least As

22
Q

What table is used to determine longitudinal reinforcement (main bar)?

A

Table C5 of EC2

23
Q

What Eurocode is used for reinforced concrete?

A

EC2

24
Q

What is effective depth = to?

A

Total depth - min cover - shear link dia. - (half main bar dia.)

25
Q

How is cover found?

A

Using table C1 and the duration of fire resistance, the value of ‘min axis distance from soffit’ = cover

26
Q

How is the exposure class found?

A

From table C2 using the exposure conditions in the question.

27
Q

Where is shear force maximum in a beam?

A

At the supports

28
Q

How is Ved Max calculated for a simply supported beam?

A

WL/2

29
Q

What locations are:

Ved1, Ved2

Calculated at?

A

Ved1 = the face of support

Ved2 = a distance ‘d’ away from the support face

30
Q

How are shear forces in a beam converted to shear stresses?

A

/ 0.9 x beam width x effective depth

31
Q

What are shear stresses compared to?

A

Concrete strut capacity, Vrd

32
Q

Where is Vrd found?

A

Table C4 of EC2

33
Q

What value is used for minimum area of shear reinforcement required?

A

Whichever the greater value of Asw/s is between the calculated and the value from table C5

34
Q

How is maximum link spacing calculated?

A

0.75 x d

35
Q

How is a beam checked for deflection?

A

Permitted span/d ratio > actual span/d ratio

36
Q

If possible, how many reinforcing bars should be used?

A

4

37
Q

How many sections are there to the eurocodes?

A

10

38
Q

What is the relationship between bending moment (BM) and shear force (SF)?

A

Where BM is max, SF is zero, and vice versa

39
Q

What is cover equal to?

A

Higher value between nominal cover to reinforcement and

Min axis distance to soffit - shear dia. - half main bar dia.

Structural Design (10 decks)

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