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# 13 - Test specimen determining compressive strength of...

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Thursday, September 13, 2007 Calculating stress in a cable: stress is an amount of force over a unit of area F = force/ area = P/A F = stress, p = force, a = cross-sectional area If the fore applied on the cable is 500 lb and if the diameter of the cable is .5 in (cross- sectional area = .196 in.^2, the tensile stress in the cable is F = 500/. 196 = 5,100 psi = 5.1 ksi Ultimate Strength If the applied force on a member results in failure, stress at the point of failure is called Ultimate Stress- also known as the ultimate strength of the material Testing compressive strength of concrete Fill a cylinder up with concrete and takes it to a lab and preserve it in a lab for a couple of weeks then they peal off the tube. And then they place it into a break machine, basically a press and then they slowly push until it breaks and then the machine reads the sensors that are on the concrete they can tell how strong the concrete is Compressive strength = load at failure/ area of cylinder = 115/ 28.27= 4100 psi = 4.1 ksi

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Unformatted text preview: Test specimen determining compressive strength of masonry Testing basically the same way as concrete. The same with steel Deformation = change of length in a member caused by a tensile for compressive stress Stress = relative change in length Ductile materials • Materials with large deformations at failure • Ultimate stain >- .5% • Steel (equal strength in tension & compression • Warning before failure Elastic material Material which when deformed under load, recovers its original shape when the load is removed Plastic material Material that does not recover its original shape when the load is removed after it has deformed E = stress/strain Greatest part of compression is at the top of the I beam and the greatest part of tension is at the bottom. Steel reinforcing in concrete increases bending strength because concrete is weak in tension and steel is strong in tension. Three basic levels of stress Tension Shear Strength...
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13 - Test specimen determining compressive strength of...

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