A simply supported beam is subjected to uniformly distributed load…

A simply supported beam is subjected to uniformly distributed load…

A simply supported beam is subjected to uniformly distributed

load (Figure 6). The measured extreme fibre strains at the centre section a-a of beam are: – 2800*10-6 at top  and + 2800*10-6 at bottom. The cross section of beam is shown in Figure 7. The beam is  made of elastic-perfectly plastic stress-strain curve as shown in Figure 8. Assume that the  stress-strain diagram is same for both tension and compression. Determine the bending moment on the centre section a-a of beam.
beam is 600x20x20cm

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-strain=0.0015
-stress= 210MPa