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Why is the reinforcement bars place at the bottom of the simple supported beam?
Wiki User
∙ 11y ago
When a simply supported beam is subject to bending; the top of the beam will be subject to compression, and the bottom of the beam will be subject to tension (think about the bottom of the beam stretching as it bends i.e. tension). Concrete is strong in compression but weak in tension, so steel reinforcement is added to allow it to resist this tension and carry bending sufficiently.
Note: bars are generally added to the compression side too but that's for another day.
Wiki User
∙ 11y ago
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Where to give lap in bottom reinforcement of beam?
It depends on the stress/load applied to a beam, but a general rule is to provide a lap where the stress is the least. In a simply supported beam with a uniformly distributed load the best place to position laps would be away from the centre of the beam.
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Why is the reinforcement bars place at bottom of the simple supported beam?
When a simply supported beam is subject to bending; the top of the beam will be subject to compression, and the bottom of the beam will be subject to tension (think about the bottom of the beam stretching as it bends i.e. tension). Concrete is strong in compression but weak in tension, so steel reinforcement is added to allow it to resist this tension and carry bending sufficiently. Note: bars are generally added to the compression side too but that's for another day.
Where to give lap in bottom reinforcement of beam?
It depends on the stress/load applied to a beam, but a general rule is to provide a lap where the stress is the least. In a simply supported beam with a uniformly distributed load the best place to position laps would be away from the centre of the beam.
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Confining reinforcement refers to reinforcement that is applied in such a way that it "confines" the concrete within it to provide increased strength and deflection capabilities. Confining reinforcement is used in both beam and column designs. In columns, spiral or helix reinforcement is implemented through the column, spiraling from top to bottom, with vertical longitudinal bars running through the inside of the helix. This prevents the concrete's diameter becoming larger under the applied load leading to failure. In correct terms it prevents the poisson's effect within the column. In beams the confining reinforcement is generally place within the compressive region of the beam. This can be utilised to increase the yield deflection of the beam as well as the yield and ultimate loads. This is a good option for increasing the ductility of high strength concrete beams which would normally fail in a brittle manner.
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It comes from The Pilgrim's Progress by John Bunyan. It was said by Presumption who was at the bottom of the hill after Christian goes to the Place of Deliverance (the Cross) and has his burden released. Presumption is at the bottom of the hill fast asleep with Simple and Sloth.
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