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sing stranded cables that apply a compressive force. ependent losses, an effective prestresss, P. 355 kip 3/8-in. diameter Grade 270 strands and the centroid

sing stranded cables that apply a compressive force. ependent losses, an effective prestresss, P. 355 kip 3/8-in. diameter Grade 270 strands and the centroid

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A bridge girder with section shown below is used for a 50 ft. simple-span. The beam is prestensioned using stranded cables that apply a compressive force P₁= 450 kips at transfer. After all time-dependent losses, an effective prestresss, P. = 355 kips, is attained. The steel consists of (29) 3/8-in. diameter Grade 270 strands and the centroid has a constant eccentricity of 12.5 inches. Answer the following: a) Given that the girder cambers upward immediately upon release of prestress force to the beam, what concrete stresses are obtained at the midspan at that loading state? c) What stresses are obtained at the midspan for the unloaded member (prestress plus self- weight only) after all important losses have occured? d) What stresses result at the midspan upon application of full service load of 1.65 kips/ft? 11'-0"-1 6" 1-6- 6" 1"-3" 6+6+ -3" 3'-0" A 369 in² Ig=50,979 in C₁ = 20.17 in. C₂=15.83 in. ²= 138 in² Wo384 plf (selfweight)
Transcribed Image Text:A bridge girder with section shown below is used for a 50 ft. simple-span. The beam is prestensioned using stranded cables that apply a compressive force P₁= 450 kips at transfer. After all time-dependent losses, an effective prestresss, P. = 355 kips, is attained. The steel consists of (29) 3/8-in. diameter Grade 270 strands and the centroid has a constant eccentricity of 12.5 inches. Answer the following: a) Given that the girder cambers upward immediately upon release of prestress force to the beam, what concrete stresses are obtained at the midspan at that loading state? c) What stresses are obtained at the midspan for the unloaded member (prestress plus self- weight only) after all important losses have occured? d) What stresses result at the midspan upon application of full service load of 1.65 kips/ft? 11'-0"-1 6" 1-6- 6" 1"-3" 6+6+ -3" 3'-0" A 369 in² Ig=50,979 in C₁ = 20.17 in. C₂=15.83 in. ²= 138 in² Wo384 plf (selfweight)
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