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20451953-Reinforced-Concrete-Design-Lecture-10-Introduction-to-Columns

20451953-Reinforced-Concrete-Design-Lecture-10-Introduction-to-Columns

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Introduction to Columns CE 4108 – Concrete Structures Design
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Three categories 1. Short compression blocks or pedestals 2. Short reinforced concrete columns 3. Long or slender reinforced concrete columns
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Short compression blocks or pedestals Height is less than three times it least lateral dimension. ACI 2.2 and 10.14: May be designed with plain concrete with a design compressive strength if 0.85 φf’ c where φ = 0.65.
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Short reinforced concrete columns A stocky member with little flexibility. Would fail first due to material failure. The load it supports is controlled by the size of the cross section and by the strength of the materials.
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Long or slender reinforced concrete columns Have large bending deformations that result in secondary moments that reduce the axial load capacity of the columns.
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Types of columns
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Axial Load Capacity of Columns [ ] st y st g c n A f A A f P + - = = ) ( 85 . 0 85 . 0 : ) 75 . 0 ( columns spiral For ' φ φ φ ACI Eq. 10-1 [ ] st y st g c n A f A A f P + - = = ) ( 85 . 0 80 . 0
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