Title: Development of a probability based load criterion for prestressed concrete highway bridge superstructures
Abstract: The use of point estimates in evaluating probability moments of functions, of several variables is a more refined technique compared with methods previously available. Its application and validity, in constructing a probabilistic model for ultimate resistance is discussed. Probabilistic models for strength and load effects are constructed and used to compute safety indices for the ultimate limit state equation. The load effects considered are due to dead load and traffic live load, the predominant bridge superstructure loads. Large scale field measurements on actual truck loadings provided the source of information required to construct a probabilistic model for live load. Safety indices are computed for prestressed concrete members designed to the existing NAASRA bridge design specification and for those designed to the draft limit states bridge code. The results show a general reduction in the safety in the proposed draft code, with the same inconsistency as in the existing code (a).
Publication Year: 1988
Publication Date: 1988-01-01
Language: en
Type: article
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