Anomalous Structural Size Effect in Cohesive Materials Like Concrete

by Jaime Planas, Univ Politecnica de Madrid, Spain,
Manuel Elices, Univ Politecnica de Madrid, Spain,

Document Type: Proceeding Paper

Part of: Serviceability and Durability of Construction Materials


This contribution analyses on theoretical grounds the size effect trends in special cases where - unlike most experimental situations in fracture research - the specimen is not precracked or the stress intensity factor is a decreasing function of crack length. The normal cases and the anomalous families are analyzed using R-Δa curves as a rough approximation of a cohesive crack behaviour. The general trends and basic equations for the anomalous cases are derived and the previously defined concept of nominal stress intensity factor and intrinsic size are redefined to make all geometries to fit into a common frame.

Subject Headings: Concrete structures | Size effect | Construction materials | Concrete | Material properties | Cracking | Structural behavior | Stress analysis

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