A rectangular beam section is limited to a size of b=250 mm and h=400 mm. Assume that bars in compression will be placed at 60 man from the compression fiber and bars in tension 60 mm from the tension fiber. Given that f'c=21 MPa and fy = 420 MPa   1. Calculate the amount of tension rebars that will have a minimum tensile strain of 0.005 compatible with concrete strain of 0.003   2. If the beam section will be reinforced with tension rebars at a minimum tensile strain of 0.005, calculate the required depth in men of uniform stress block on concrete in compression.   3. With this amount of tension rebars, calculate the design strength of the beam section in kN m.   4. For the beam to sustain a factored moment of 160 kN.m, what will be the required amount of tension steel area in mm² in addition to the tension rebars described in item #1.

The end block of a post-tensioned beam is 100 mm x 150 mm. A prestressing cable consisting of 7 wires of 6 mm dia strand and stressed to 800 MPa has to be anchored at the center of the block. The anchorage plate is 75 mm x 75 mm. If the concrete mix is M45 and the permissible bending stress in M. S. steel plate is 165 MPa, determine the thickness of the anchorage plate.

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