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QUESTION: 1

High strength steel used in prestressed concrete can take how much maximum strain?

Solution:

QUESTION: 2

For a rectangular prestressed beam designed for operating stress conditions, what is the maximum prestressing force?

Solution:

QUESTION: 3

If a simply supported concrete beam, prestressed with a force of 2500 kN, is designed by load balancing concept for an effective span of 10 m and to carry a total load Of 40 kN/m, the central dip of the cable profile should be

Solution:

Let the dip of the cable be h.

Upward pressure provided by the parabolic cable = 8Ph/L^{2}

In order this upward pressure may fully balance the external loading.

8Ph/L^{2} = w

⇒ = 40 ⇒ h = 0.2 m

⇒ h = 200 mm

QUESTION: 4

A prestressed concrete beam has a cross- section with the following properties:

A = 46,400 mm^{2}, I = 75.8 x 10^{7} mm^{4},

y_{bottom} = 244 mm, y_{top} = 156 mm.

It is subjected to a prestressing force at an eccentricity ‘e’ so as to have a zero stress at the top fibre. The value of ‘e’ is given by

Solution:

For zero stress at top fibre,

P/A = Pe/Z

⇒

⇒

QUESTION: 5

in pre-stressed concrete

Solution:

QUESTION: 6

The purpose of reinforcement in pre-stressed concrete is

Solution:

QUESTION: 7

Prestress loss due to friction occurs

Solution:

QUESTION: 8

The coefficient of shrinkage for high grade concrete for pre-tensioned work is

Solution:

QUESTION: 9

If 'P' is the prestressing force applied at a maximum eccentricity 'g' at mid-span, figure, to balance the concentrated load 'W', the balancing load will be

Solution:

QUESTION: 10

Consider the following factors

1. initial prestress

2. losses in prestress

3. depth of cable from extreme compression fibre

Those which affect the ultimate moment capacity of a prestressed concrete beam would include

Solution:

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