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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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FAQs on PPT: Doubly Reinforced Beams - RCC & Prestressed Concrete - Civil Engineering (CE)

1. What is a doubly reinforced beam in civil engineering?
Ans. A doubly reinforced beam is a type of reinforced concrete beam that contains reinforcement in both the tension and compression zones to increase its load-carrying capacity and resistance to bending.
2. How is a doubly reinforced beam different from a singly reinforced beam?
Ans. In a doubly reinforced beam, reinforcement is provided in both the tension and compression zones, whereas in a singly reinforced beam, reinforcement is only provided in the tension zone. This additional reinforcement in the compression zone of a doubly reinforced beam helps to improve its structural performance and prevent premature failure.
3. What are the advantages of using doubly reinforced beams?
Ans. Some advantages of using doubly reinforced beams include: - Increased load-carrying capacity - Improved resistance to bending and deflection - Reduced risk of concrete cracking and failure - Enhanced structural stability and durability
4. How is the reinforcement ratio determined for doubly reinforced beams?
Ans. The reinforcement ratio for doubly reinforced beams is determined based on the requirements of the design, considering factors such as the applied loads, span length, and desired structural performance. It is typically calculated by dividing the total area of reinforcement in both the tension and compression zones by the cross-sectional area of the beam.
5. What are the common applications of doubly reinforced beams in civil engineering?
Ans. Doubly reinforced beams are commonly used in various civil engineering applications, including: - Bridges and flyovers - High-rise buildings - Industrial structures - Retaining walls - Underground structures These applications require the use of doubly reinforced beams to withstand higher loads and provide enhanced structural integrity.
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