Problem 2 - Minimizing End Region Stress (a) Discuss and illustrate the three methods for minimizing end region stress and maximizing mid-span capacity in pretensioned girders. (b) Calculate the moment capacity and end region stress for the two sections shown below using the equations given in class and the information given in the figure. Section 1 (end) 40% of strands debonded Section 2 (midspan) 0% of strands debonded Properties for Both Sections p = 17" I = 270,000 in fps = 265 ksi y = 26.37" fpe=181 ksi Mn Apfps(ep+yt-/2) Ap = 2.60 in fend a = 0.32" Ap = 4.34 in a = 0.53" 19