Answer Happy

For the beam and section shown below, find: a) For the two-span post-tensioned beam loaded with service loads as shown (includes beam weight, dead load and live load) calculate the top and bottom concrete fiber flexural stresses at the center support "B" and at the points of maximum positive moment in spans A-B and B-C with "x"=4in. in Span A-B. b) If the concrete 28 day compressive strength is 5000 psi, does the beam satisfy the ACI allowable service stresses? c) Repeat a) & b) above with "x"=12 in. Calculate only the tensile stresses for this part and check them against the ACI allowable tensile stress. d) Repeat a) & b) above with "x" = 4 in and reduce the number of tendons in Span A-B only to 8. Calculate only the tensile stresses at the bottom of the beam in the spans for this part and check the against the ACI allowable tensile stress. e) Discuss what you learn when you compare the results from parts c and d with the ones from a and b. A 55-0" 65-0" Section Fe-319.4 kips (12 Tendons) w2.0 KIE c.g. ELEVATION 114" 34" 14" SECTION 18"