Complete Problem 3! Problem 2 included for
reference.
Complete Problem 3 Problem 2 Included For Reference 1 (144.13 KiB) Viewed 44 times
Problem 3: Repeat Problem 2, but use the strain compatibility form of analysis. For the reinforcing steel, use two different models: a) fs = fy for Es > Ey (which is the model we have been using); and b) the following stress-strain relations, which should also be plotted. fs= Esɛs for 0≤ɛs≤ɛy where Es 29000 ksi Ey=fy/Es fs fy for Ey ≤ Es ≤ Esh Ey≤Es≤Esh Esh=-9×10-5fy+0.0145 fs= fy+Esh(&s=sh) [ 1 Esh(Es-Esh) 4(fsu-fy) for Es>Esh Esh= -9.44fy+1788 fsu= 0.523 fy+73.2 Compare the resulting M₁ values for these two cases and the results from Problem 2.
Problem 2: Determine Mn for the beam section shown. Use eight #9 bars, f'c = 3.5 ksi and fy = 60 ksi. -28¹¹²- 33.5" 36" As All flange and web thicknesses are 5".
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