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A rectangular concrete beam having a width of 450 mm has a total depth of 575 mm. It is reinforced for tension having a steel area of 3200 mm2 and steel area for compression equal to 900mm2. The compression bars are placed at a distance of 62.5 mm from the top of the beam while tension bars are placed 75 mm from the bottom of the beam. Use fc’ =21 Mpa and fy = 345 mpa.

11. Location of the neutral axis from extreme compression fiber, in mm.

12. Depth of compression block.

13. Actual stress of compression bars.
A rectangular concrete beam having a width of 450 mm has a total depth of 575 mm. It is reinforced for tension having a steel area of 3200 mm² and steel area for compression equal to 900mm². The compression bars are placed at a distance of 62.5 mm from the top of the beam while tension bars are placed 75 mm from the bottom of the beam. Use fc' =21 Mpa and fy = 345 mpa. Which of th following gives: 11.0 Location of the neutral axis from extreme compression fiber, in mm. 12.0 Depth of compression block. 13.0 Actual stress of compression bars.