- A Bridge Girder Has A Simple Span Of 55 Ft 16 8 M It Is Subjected To A Total Superimposed Service Load Of 4 600 Plf 1 (40.72 KiB) Viewed 60 times
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A bridge girder has a simple span of 55 ft (16.8 m). It is subjected to a total superimposed service load of 4,600 plf (67.2 kN/m). Design the section as a post-tensioned bonded beam using an AASHTO standard section with parabolically draped tendons. Assume a 7 in. situ-cast slab over the precast section and the following data: Beams spaced at 7'-6" c. to c. fp = 270,000 psi stress relieved (1,862 MPa) Eps = 28 x 106 psi (193 × 10³ MPa) f: = 5,000 psi (34.5 MPa) normal-weight concrete slab f = 3,000 psi (20.7 MPa) normal-weight concrete fa = 4,000 psi (27.6 MPa) Design the bridge section as unshored for service-load and ultimate-load conditions, and detail all the reinforcement including the anchorage zone steel and the nonprestressed tensile steel. Assume the section to be constant throughout the span, and, for the limit state at failure analysis, find the stress fps at nominal strength by (a) the ACI approximate procedure, and (b) strain compatibility. Assume a total prestress loss of 20 percent. Design the anchorage zone reinforcement by the strut- and-tie method and compare the results with those obtained using the linear elastic analysis ap- proach.