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ECS 478CS 478
REINFORCED CONCRETE DESIGNEINFORCED CONCRETE DESIGN
Chapter 2:hapter 2:
ECS 478CS 478
REINFORCED CONCRETE DESIGNEINFORCED CONCRETE DESIGN
Chapter 2:hapter 2:
ECS 478 Chapter 2 :
Continuous Beam Design & Detailing continuous beam
design
REINFORCED CONCRETE BEAMEINFORCED CONCRETE BEAM
DESIGN DETAILINGESIGN DETAILING
REINFORCED CONCRETE BEAMEINFORCED CONCRETE BEAM
DESIGN DETAILINGESIGN DETAILING
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CONTINUOUS BEAMCONTINUOUS BEAMCONTINUOUS BEAMCONTINUOUS BEAM
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LEARNING OUTCOME :LEARNING OUTCOME :LEARNING OUTCOME :LEARNING
OUTCOME :
1.0 Determine moments and shear forces in continuous
beam.
By completing this chapter, students shall be able to:
ECS 478 Chapter 2 :
Continuous Beam Design & Detailing continuous beam
design
. es gn a con nuous eam an app y ura y anserviceability
checks.
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Introduction to Continuous Beam
Continuous beamsare beams thathave more thanone span andnormally
found incast in-situ
ECS 478 Chapter 2 :
Continuous Beam Design & Detailing continuous beam
design
cons ruc on.
Figure belowshows failuremode of a
continuous beamand the positionof the mainreinforcement.
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Assumption Loading from Slab
Loading acting on a beam can be contributed by loading from
the supported slabs, supported secondary beams,brickwall, and
other structure elements such as staircase,roof truss etc.
Load distribution from the slab to beam always depends on
the
ECS 478 Chapter 2 :
Continuous Beam Design & Detailing continuous beam
design
,the slabs.
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Assumption Loading from Slab (cont)
For rectangular slabs that supported in 4-sides, the
followingmethod can be used: 0ne-way slab (L/Lx > 2.0)
ECS 478 Chapter 2 :
Continuous Beam Design & Detailing continuous beam
design
where n = uniform distributed load on slab (kN/m2)
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Flanged beams
Flanged beams are cast as a part of the slab system. When the
beams are resisting sagging moments, the slab act as acompression
flange and the members designed as T or L beams.
With hogging moments, the slab will be in tension and the
membersdesigned as a rectangular section.
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design
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The effective flange width, beff (Cl.5.3.2.1) :
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Analysis Method
There are few methods that could be used in obtaining shearand
moment values of a continuous beam for design purposes:
o Use of shear and moment coefficiento Moment distributiono
Stiffness method
ECS 478 Chapter 2 :
Continuous Beam Design & Detailing continuous beam
design
(a) Shear & moment coefficient
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Analysis Method cont
(a) Shear & moment coef.
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ECS 478 Chapter 2 :
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design
Design Procedure for a rectangular beam :
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ECS 478 Chapter 2 :
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design
Design Procedure for a flanged beam :
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Shear Reinforcement (Cl. 6.2)
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Shear Reinforcement (Cl. 6.2)
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Detailing
ECS 478 Chapter 2 :
Continuous Beam Design & Detailing continuous beam
design
