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Research Spotlight: Modal Interaction in Design of Improved Stiffened Trapezoidal Profiled Sheeting:

2018 SSRC Annual Stability Conference

Session S7: Stability of Thin-Walled Members Thursday, April 12, 2018 11:30 a.m.

Modal Interaction in Design of Improved Stiffened Trapezoidal Profiled Sheeting: Shape Grammar, Elastic Stability and Strength Analysis

The main goal of the present research is to investigate a procedure to design of improved stiffened trapezoidal profiled sheeting. In recent work, the authors have combined shape grammar and linear elastic analysis in a semi-automatic procedure to achieve improved solutions with a fitness function based on flexural bending moment critical values (top compression and bottom compression). Two questions have been proposed in this paper: (i) what the amount of strength erosion is induced by modal interaction in “best shapes” from elastic stability criteria, (ii) how to find solutions where this interaction has less pronounced effects in the neighborhood of the best shapes. Two procedures were performed to answer these questions: (a) the semi automatic shape grammar procedure keeps the records from the start point to best solution, which leads to identify how geometric parameters induces buckling modes with a certain difference of critical values and (b) Direct Strength Method has been implemented in the semi-automatic procedure Shape Grammar / Linear Elastic Stability Analysis.

Juarez M.S. Franco, Federal Rural University of Rio de Janeiro, Seropédica, Brazil; João P.M. Garcia and Eduardo M. Batista, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil

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