- 1 A Simply Supported Symmetrical T Beam Shown In Cross Section In Fig 6 1 Is Used On A 48 Ft Simple Span The Section 1 (124.01 KiB) Viewed 24 times
1. A simply supported symmetrical T beam shown in cross section in Fig. 6-1 is used on a 48 ft simple span. The section properties are provided below. Compute the stresses at top and bottom in concrete at midspan using the three methods taught in the class: a) elastic analysis, b) internal force balance, and c) load balance, and due to following two loading conditions: 1) Initial prestressing force Pi plus SW, 2) Effective prestressing force Pe plus SW+DLsuper+ LL. fe' = 7,500 psi fci' = 5,000 psi [pu = 270 ksi Eps = 28,700 psi fsi = 189 ksi fse = 160 ksi Aps = 1.071 in? (7- 42" strand) SW = 0.583 k/ft. DLsuper = 0.076 k/ft. LL = 0.380 k/ft. A = 560 in? Is = 21,805 inº y = 6.196 in. yo = -16.804 in. Pi= 202.42 kips Pe=171.36 kips 76" 5" 18" 13.8" 10" 6.2", (" 13.8" A 3", tур. 48 ft k Figure. 6-1