design of reinforced concrete deep beams |deep beams are designed for
design of reinforced concrete deep beams |deep beams are designed for
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Reinforced concrete deep beams
A deep beam is a type of beam having a high depth comparable to the span. As Per IS 456:2000 Deep definition
Deep Beam – Types
- Simply Supported or Continuous.
- Rectangular or Flanged Beams.
- Top or Bottom or Side Loaded.
- with or without openings.
Behaviour of Deep Beams
• The elementary theory of bending for simple beams may not be applicable to deep beams even under the linear elastic assumption.
• A deep beam is in fact a vertical plate subjected to loading on its own plane. The strain or stress distribution across the depth is no longer a straight line, and the variation is mainly dependent on the aspect ratio of the beam.
• The analysis of a deep beam should therefore be treated as a two-dimensional plane stress problem, and two-dimensional stress analysis methods should be used in order to obtain a realistic stress distribution in deep beams even for a linear elastic solution.
Arch and tie action
• Mode of failure is not associated with beam action.
• The variation in bending moment along th beam span is mainly affected by a change of the lever arm rather than the magnitude of th internal horizontal actions.
• Such behaviour has been found to result from the fact that the force sustained by the tension reinforcement of a deep beam at its ultimate limit state is constant throughout the beam span.
• RC deep beam at its ultimate limit state canno rely on beam action to sustain the shea forces, it would have to behave as a tied arch.
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