Design of Doubly Reinforced Beam

DOUBLY REINFORCED BEAM
By:-
ISHAN GARG
120695030
B.Arch. , 5th Sem.

 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)

 Assumption
 Compression is resisted only by compression steel.
 Tension is resisted by tension steel.
 Stress in compression steel = Stress in tension steel
 Concrete serves only as a web of an I

 Determining the amount of moment of resistance
knowing breadth, depth, area of tension and
compression steels and their covers.
 Design involves the determination of cross-sectional
dimensions, area of tension and compression
reinforcements
 First step
 to determine whether compression steel is required.
 done by comparing the factored bending moment
with the limiting moment of resistance of a singly
reinforced section

Design of Doubly Reinforced Beam

Design of Doubly Reinforced Beam

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Design of Doubly Reinforced Beam