A pre-stressed rectangular beam which carries two concentrated loads W at L/3 from either end, is provided with a bent tendon with tension P such that central one-third portion of the tendon remains parallel to the longitudinal axis, the maximum dip h is

RCC Structures Design
A pre-stressed rectangular beam which carries two concentrated loads W at L/3 from either end, is provided with a bent tendon with tension P such that central one-third portion of the tendon remains parallel to the longitudinal axis, the maximum dip h is

WL/P

WL/3P

WL/4P

WL/2P

WL/P

WL/3P

WL/4P

WL/2P

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RCC Structures Design
With usual notations the depth of the neutral axis of a balanced section, is given by

mc/t = n/(d - n)

mc/t = (d - n)/n

t/mc = (d - n)/n

t/mc = (d + n)/n

mc/t = n/(d - n)

mc/t = (d - n)/n

t/mc = (d - n)/n

t/mc = (d + n)/n

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RCC Structures Design
To ensure uniform pressure distribution, the thickness of the foundation, is

Increased gradually towards the edge

Decreased gradually towards the edge

Kept zero at the edge

Kept uniform throughout

Increased gradually towards the edge

Decreased gradually towards the edge

Kept zero at the edge

Kept uniform throughout

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RCC Structures Design
If the tendon is placed at an eccentricity e below the centroidal axis of the longitudinal axis of a rectangular beam (sectional modulus Z and stressed load P in tendon) the stress at the extreme top edge

Is increased by Pe/Z

Is decreased by Pe/Z

Remains unchanged

Is increased by PZ/e

Is increased by Pe/Z

Is decreased by Pe/Z

Remains unchanged

Is increased by PZ/e

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RCC Structures Design
For a ribbed slab

Clear spacing between ribs shall not be greater than 4.5 cm

Width of the rib shall not be less than 7.5 cm

Overall depth of the slab shall not exceed four times the breadth of the rib

All listed here

Clear spacing between ribs shall not be greater than 4.5 cm

Width of the rib shall not be less than 7.5 cm

Overall depth of the slab shall not exceed four times the breadth of the rib

All listed here

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RCC Structures Design
After pre-stressing process is completed, a loss of stress is due to

Elastic shortening of concrete

Creep of concrete

All of the listed here

Shrinkage of concrete

Elastic shortening of concrete

Creep of concrete

All of the listed here

Shrinkage of concrete

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RCC Structures Design

RCC Structures Design A pre-stressed rectangular beam which carries two concentrated loads W at L/3 from either end, is provided with a bent tendon with tension P such that central one-third portion of the tendon remains parallel to the longitudinal axis, the maximum dip h is

RCC Structures Design With usual notations the depth of the neutral axis of a balanced section, is given by

RCC Structures Design To ensure uniform pressure distribution, the thickness of the foundation, is

RCC Structures Design If the tendon is placed at an eccentricity e below the centroidal axis of the longitudinal axis of a rectangular beam (sectional modulus Z and stressed load P in tendon) the stress at the extreme top edge

RCC Structures Design For a ribbed slab

RCC Structures Design After pre-stressing process is completed, a loss of stress is due to

RCC Structures Design
A pre-stressed rectangular beam which carries two concentrated loads W at L/3 from either end, is provided with a bent tendon with tension P such that central one-third portion of the tendon remains parallel to the longitudinal axis, the maximum dip h is

RCC Structures Design
With usual notations the depth of the neutral axis of a balanced section, is given by

RCC Structures Design
To ensure uniform pressure distribution, the thickness of the foundation, is

RCC Structures Design
If the tendon is placed at an eccentricity e below the centroidal axis of the longitudinal axis of a rectangular beam (sectional modulus Z and stressed load P in tendon) the stress at the extreme top edge

RCC Structures Design
For a ribbed slab

RCC Structures Design
After pre-stressing process is completed, a loss of stress is due to