A numerical method to generate optimal load paths in plain and reinforced concrete structures. (1st July 2016)

• Record Type: Journal Article
• Authors: Bruggi, Matteo
• Is Part Of: Computers & structures. Volume 170(2016)
• Page Start: 26
• Page End: 36
• Publication Date: 2016-07-01
• Subjects: Topology optimization -- Strut-and-tie models -- Reinforced concrete structures -- Plain concrete structures -- Energy-based methods; Structural engineering -- Data processing -- Periodicals; Electronic data processing -- Structures, Theory of -- Periodicals; 624.171
• DOI: 10.1016/j.compstruc.2016.03.012
• Languages: English
• ISSNs: 0045-7949

Abstract

Highlights: Topology optimization is used to find optimal truss-like load paths in r.c. members. Concrete is modeled as a hyper-elastic material that carries only compression. Strut-only models are generated for structures made of plain concrete. Strut-and-tie models are generated for concrete structures with prescribed rebar cages. Stress diffusion problems can be dealt with in case of point forces. Abstract: A numerical method based on topology optimization is proposed to generate optimal strut-only models for structures made of plain concrete and optimal strut-and-tie models for concrete structures where fixed regions of reinforcement are prescribed. Assuming concrete as a hyper-elastic material carrying only compression, both the inherently nonlinear equilibrium equation and the energy-based topology optimization problem are solved within the same minimization procedure. Numerical simulations investigate load paths within the two-dimensional domain in case of conventional rebar cages. A stress diffusion problem is considered as well.