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2. (20 points) A flat bar of thickness t = 10 cm is fixed to a wall at one end and subjected to a


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2. (20 points) A flat bar of thickness t = 10 cm is fixed to a wall at one end and subjected to a uniaxial load P, as shown in fig. 2. Note that the bar has a 10 cm edge crack located on it. The bar is made of concrete with the following properties: ult = 3 MPa, E=30 GPa, and K = 1.4 MPa/m. == (a) Determine the maximum allowable force P that can be applied before failure for a safety factor of 2. (b) Indicate where the beam is likely to fail due to this loading. 1 square 10cm x 10cm = Solution: (a) Pall 29.386 kN. (b) At the crack. Figure 2

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