Stress and strain relationship of concrete | Civil Engineering Course

Описание: Stress and strain relationship of concrete
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hi
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friends welcome to dawn academy in this
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the lesson we will learn about the
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stress-strain relationship of concrete
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in this clip, we can see workers pouring
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concrete
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into large steel molds on a construction
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site the experimental
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or actual stress-strain curve for
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concrete is very difficult to use in
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design
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therefore i s code 456 to 2000 has
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simplified or idealized it as shown in
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figure
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for design purposes the compressive
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strength of concrete in the structure
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and taken is 0.67 times the
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characteristic strength
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the 0.67 factor is introduced to account
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for the difference in the strength
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indicated by a cube test and the
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strength of concrete in the actual structure
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a stress-strain curve as shown in figure
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has been accepted as design stress
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strain curve for concrete in eye
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s 456 to 2000 the peak stress occurs at
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a strain of about 0.002
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from 0 strain to 0.0020 strain
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the curve is parabolic from 0.0020
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strain to 0.0035 strain
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the stress remains constant for the
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purpose of design
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in the limit state method the compressive
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strength of concrete in the structures
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is assumed to be 0.67 fck
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characteristic strength for the material
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strength a partial factor of safety
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rms equals 1.5 is applied in addition to
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this
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the maximum compressive stress and
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concrete for design purposes is equal to
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0.67 times characteristic strength
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divided by partial safety factor 1.5 is
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equal to 0.446 times the characteristic
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strength
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