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07.03: Distortional‐global interaction in lipped channel beams: Part II: Strength, relevance and DSM design
Author(s) -
Martins André Dias,
Camotim Dinar,
Dinis Pedro Borges
Publication year - 2017
Publication title -
ce/papers
Language(s) - English
Resource type - Journals
ISSN - 2509-7075
DOI - 10.1002/cepa.193
Subject(s) - buckling , structural engineering , beam (structure) , moment (physics) , yield (engineering) , engineering , mode (computer interface) , failure mode and effects analysis , bifurcation , aspect ratio (aeronautics) , relevance (law) , mathematics , nonlinear system , physics , computer science , materials science , classical mechanics , composite material , quantum mechanics , operating system , law , political science
This work aims at presenting and discussing numerical results concerning the post‐buckling behaviour, strength and design of two types of simply supported lipped channel (LC) beams under uniform major‐axis bending and undergoing distortional‐global (D‐G) interaction. The relevance of the interaction effects is assessed by determining the beams whose ultimate strength and/or failure mode are visibly affected by them. Distinct (i) global‐to‐distortional critical buckling moment ratios ( R GD ) and (ii) yield‐to‐non critical buckling (distortional or global) moment ratios ( R y ) are considered and, thus, different failure mode natures (global, distortional or interactive) are expected. For each beam type, combinations of 41 geometries and 11 yield stresses are dealt with, in order to (i) characterise the beams experiencing “true D‐G interaction” ( R GD ≈1.0) and “secondary global‐bifurcation D‐G interaction” ( R GD >1.0 + high R y ) and (ii) investigate the possible occurrence of “secondary distortional‐bifurcation D‐G interaction” ( R GD <1.0 + high R y ). The results presented consist of (i) relevant non‐linear equilibrium paths, (ii) deformed configuration evolutions along those paths and (iii) figures providing the failure mode characterisation. Then, the numerical failure moments obtained are compared with their predictions by (i) the currently codified DSM (Direct Strength Method) beam global and distortional strength curves, and (ii) proposed DSM‐based design approaches, specifically developed to handle D‐G interactive failures.