Performance-Based Optimization for Strut-Tie Modeling of Structural Concrete
Publication: Journal of Structural Engineering
Volume 128, Issue 6
Abstract
Conventional trial-and-error methods are not efficient in developing appropriate strut-and-tie models in complex structural concrete members. This paper describes a performance-based optimization (PBO) technique for automatically producing optimal strut-and-tie models for the design and detailing of structural concrete. The PBO algorithm utilizes the finite element method as a modeling and analytical tool. Developing strut-and-tie models in structural concrete is treated as an optimal topology design problem of continuum structures. The optimal strut-and-tie model that idealizes the load transfer mechanism in cracked structural concrete is generated by gradually removing regions that are ineffective in carrying loads from a structural concrete member based on overall stiffness performance criteria. A performance index is derived for evaluating the performance of strut-and-tie systems in an optimization process. Fundamental concepts underlying the development of strut-and-tie models are introduced. Design examples of a low-rise concrete shearwall with openings and a bridge pier are presented to demonstrate the validity and effectiveness of the PBO technique as a rational and reliable design tool for structural concrete.
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Information
Published In
Journal of Structural Engineering
Volume 128 • Issue 6 • June 2002
Pages: 815 - 823
Copyright
Copyright © 2002 American Society of Civil Engineers.
History
Received: Jul 17, 2001
Accepted: Oct 9, 2001
Published online: May 15, 2002
Published in print: Jun 2002
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