Consider a concrete element under a biaxial compressive stress condition. Assume uniaxial compressive strength of concrete...
Consider a concrete element under a biaxial compressive stress condition. Assume uniaxial compressive strength of concrete is fc'. What is the maximum compressive stress that can be applied to the element? Select one:
a. fc'
b. Need additional information
c. Higher than fc'
d. Less than fc'
Homework Answers
Answer Option C Higher than fc'
It is found that the strength of concrete in biaxial compression is greater than in uniaxial compression by up to 27 percent.
Why it is so??
Failure planes in uniaxial compression are the planes of principal tensile strains, which are parallel to the direction of the applied load.
Biaxial compression
In the case of biaxial compression, the failure planes are the planes of maximum principal tensile strains, which are parallel to both the applied principal compressive stresses. Such loading causes an increase in overall strength. The strength increase can be as high as 27%.
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Consider a concrete element under a biaxial compressive stress
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131 The concrete beam is reinforced with three 20-mm- diameter steel rods. Assume that the concrete cannot support tensile stress. If the allowable compressive stress for concrete is (allown2.5 MPa and the allowable tensile stress for steel is (?allow)st-220 MPa, determine the required dimension d so that both the concrete and steel achieve their allowable stress simultaneously. This condition is said to be 'balanced'. Also, compute the corresponding maximum allowable internal moment M that can be applied to the beam....
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