Cantilever Beam Reinforcement Cantilever Beam Reinforcementįor the Cantilever beam, the top and bottom bars from the adjacent span are continued till the end of the cantilever. Multi span beam reinforcement at JunctionĪt intermediate junction the top and bottom reinforcement are extended in adjacent spans.Īll the extensions are governed by design but typically the extra top bars are extended to one fourth of span length in the adjacent beam. In multi span or continuous beam we have similar kind of arrangement for bottom reinforcement, top reinforcement, side face reinforcement and stirrups as in single span beam except for the intermediate junctions. Multi Span or Continuous Beam Multi Span or Continuous Beam, Continuous Beam Reinforcement Next, we will have a look at multi span or continuous beam arrangement with a cantilever at the end. This Ends our Single span beam reinforcement. Lastly, based on hook angle, hooks can be 180-degree, 135-degree or 90-degree as per design requirements. Based on the loops, stirrup can be open looped or closed looped. They can be single legged, 2 legged, 4 legged and so on. Stirrups can be classified based on number of legs they have.
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The closely placed stirrups must be spread at a minimum distance of 2 times the depth of the beam, but if required by design, closely spaced stirrups may be distributed along the whole length of beam. They are closely placed near the supports of the beam as shear force is maximum near supports.
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Stirrups also add to the shear strength of concrete. Stirrups prevent the shear, flexural and torsional cracks which occur at 45 degrees to the main axis of the beam.
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Stirrups or transverse reinforcement resist the shear stresses in the beam and hold the longitudinal reinforcement in place. These bars are provided equally on both faces of the beam. Additionally, side face bars avoid torsional buckling in deep beams and improve ductility. Side face reinforcement also take part in resisting axial forces along the beam.
#Facebar santa monica crack
They also resist the torsional forces and resist 45-degree crack produced due to torsion. Side face reinforcement runs along the sides of the beam and resist the crack width in the tension zone of concrete section.
#Facebar santa monica code
This value of depth differs from code to code. Side face reinforcement are generally provided to deep beams which have depth higher than 900 mm or 36 inches (Mentioned in code: ACI-318). Side Face Reinforcement Side Face Reinforcement In case if additional reinforcement is required by design, they are provided as second layer below the top layer and are extended by one fourth of span length from face of column or as required by design. Top reinforcement also resists the bending stresses produced at the supports. Top reinforcement runs from column to column and have a 90-degree hook with sufficient anchorage at the ends. If more additional reinforcement is required, they are added in similar way in third layer and so on. If additional reinforcement is required by design, they are provided as second layer above the bottom layer. They run from column to column and have a 90-degree hook at the ends to provide sufficient anchorage. They also resist the tension cracks which occur at bottom of beam, since concrete is weak in tension. In a single span beam, first we have is bottom reinforcement, which resist the beam from bending stresses.
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Single Span Beam Single Span Beam Bottom Reinforcement Bottom Reinforcement Let’s understand the beam reinforcement one by one. Additionally, reinforcement prevent cracking of concrete due to shear stresses, shrinkage and temperature stresses. It resists tension forces, increase the compression capacity, enhance ductility and reduce long-term deflections in the concrete. Reinforcement are essential part of a concrete beam. First we will see the reinforcement distribution in a single span beam and later we will have a look at multi span or continuous beams. In this post we will learn about about typical reinforcement detail in a concrete beam.