Bridges for Service Life Beyond 100 Years: Service Limit State Design (2014) / Chapter Skim
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Pages 310-312
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310 The derivation of the resistance prediction equation for a prestressed concrete girder subjected to flexural loading is shown in this appendix. Figure D.1 displays the stress distribution diagram for a typical prestressed concrete bridge girder at various stages of loading.
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From page 311... ...
311 Equation D.5 can be simplified and rewritten as a quadratic equation with unknown c, neutral axis depth, as follows in Equation D.6: i 2 2 1 2 1 2 0 (D.6)
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From page 312... ...
312 where ec = strain in concrete at bottom fiber; Ec = elastic modulus of concrete; Dfpt = change in prestressing tendons stress between decompression and the stress in concrete at the bottom of the girder reaching fct assuming uncracked section; and fcb = concrete allowable tensile stress at the bottom of the girder. According to the current AASHTO LRFD Bridge Design Specifications (2012)
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