PPT - Doubly Reinforced Beams Civil Engineering (CE) Notes | EduRev

RCC & Prestressed Concrete

Civil Engineering (CE) : PPT - Doubly Reinforced Beams Civil Engineering (CE) Notes | EduRev

 Page 1


DOUBLY REINFORCED BEAM
Page 2


DOUBLY REINFORCED BEAM
? Having steel in compression and tension zones
? Used in such situations
? the ultimate moment of resistance required is
greater than the ultimate moment of resistance of
the singly reinforced balanced section
? when depth of the beam is constraints
Page 3


DOUBLY REINFORCED BEAM
? Having steel in compression and tension zones
? Used in such situations
? the ultimate moment of resistance required is
greater than the ultimate moment of resistance of
the singly reinforced balanced section
? when depth of the beam is constraints
? Beam will be found necessary when the depth of the
beam is restricted
? Also to serve functional or aesthetic requirements.
? Reinforcing on the tension side not enough to resist the
bending moment.
? As increase in quantity of steel on tension side,
moment of resistance get increased indefinitely.
? However, the total tension reinforcement cannot
exceed the maximum permissible tension
reinforcement.
Page 4


DOUBLY REINFORCED BEAM
? Having steel in compression and tension zones
? Used in such situations
? the ultimate moment of resistance required is
greater than the ultimate moment of resistance of
the singly reinforced balanced section
? when depth of the beam is constraints
? Beam will be found necessary when the depth of the
beam is restricted
? Also to serve functional or aesthetic requirements.
? Reinforcing on the tension side not enough to resist the
bending moment.
? As increase in quantity of steel on tension side,
moment of resistance get increased indefinitely.
? However, the total tension reinforcement cannot
exceed the maximum permissible tension
reinforcement.
? Live loads may alternate could occur on both face of
member.
? Loading may be eccentric,
? Also eccentricity of the load may change from one
side of the axis to another side.
? The member may be subjected to dynamic loading
(eg.:-vibrations or impact or accidental lateral thrust)
Page 5


DOUBLY REINFORCED BEAM
? Having steel in compression and tension zones
? Used in such situations
? the ultimate moment of resistance required is
greater than the ultimate moment of resistance of
the singly reinforced balanced section
? when depth of the beam is constraints
? Beam will be found necessary when the depth of the
beam is restricted
? Also to serve functional or aesthetic requirements.
? Reinforcing on the tension side not enough to resist the
bending moment.
? As increase in quantity of steel on tension side,
moment of resistance get increased indefinitely.
? However, the total tension reinforcement cannot
exceed the maximum permissible tension
reinforcement.
? Live loads may alternate could occur on both face of
member.
? Loading may be eccentric,
? Also eccentricity of the load may change from one
side of the axis to another side.
? The member may be subjected to dynamic loading
(eg.:-vibrations or impact or accidental lateral thrust)
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