System Reliability Models for Precast Slabs

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Title: System Reliability Models for Precast Slabs

Author(s): Sami W. Tabsh and Alex Aswad

Publication: Special Publication

Volume: 141

Issue:

Appears on pages(s): 183-204

Keywords: failure; flexural strength; floors; hollow core slabs; loads (forces); models; precast concrete; reliability; shear properties; statistical analysis; strength; Design

Date: 12/1/1993

Abstract:
A reliability-based approach is used to recommend allowable edge loads for precast hollow core slabs. Full-scale test results are used to predict the statistical parameters of the resistance at the edge. The study indicated that the allowable load is a function of dead-to-live load ratio and concrete strength. The analysis is extended to include system reliability of the whole slab due to different failure modes. The failure modes include flexure at midspan and total shear at the ends, in addition to local failure at the edge. The system modeling is composed of a series system made up of three partially correlated elements. A numerical example is also included for illustration. The approach will help engineers make a rational selection of allowable edge loads that occur around large floor openings.