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A platform for research: civil engineering, architecture and urbanism
Design optimization of 3D printed concrete elements considering buildability
https://orcid.org/0000-0002-2871-3286
Abstract In this paper, we propose an integration of 3D concrete printing buildability requirements into a formal structural optimization problem. The aim is to enable the design of a structural element while balancing between its performance as a load-bearing element and its stability during the printing process. Physical buildability is quantified by stress constraints imposed on the fresh concrete, whose time-dependent strength is determined according to a rheological material characterization. This is complemented by geometric buildability that is achieved by imposing constraints on the overlap between layers. The output of optimization is the shape of the structure and the time instance at which each layer is deposited. Several prototypes were printed for verifying the numerical buildability predictions, showing acceptable quantitative agreement between theory and experiments. A critical trade-off between structural performance and buildability is exposed, that emphasizes the need for further development of holistic methodologies that integrate structural design, material design and tooling limitations.
Highlights Structural optimization with buildability requirements for 3D concrete printing. Time-dependent strength of fresh concrete is considered by stress constraints. Excessive overhangs are avoided by geometric overlap constraints. Prototypes of a column and a beam are printed without accelerators. The numerical predictions of buildability and the experiments show an acceptable level of agreement.
Design optimization of 3D printed concrete elements considering buildability
https://orcid.org/0000-0002-2871-3286
Abstract In this paper, we propose an integration of 3D concrete printing buildability requirements into a formal structural optimization problem. The aim is to enable the design of a structural element while balancing between its performance as a load-bearing element and its stability during the printing process. Physical buildability is quantified by stress constraints imposed on the fresh concrete, whose time-dependent strength is determined according to a rheological material characterization. This is complemented by geometric buildability that is achieved by imposing constraints on the overlap between layers. The output of optimization is the shape of the structure and the time instance at which each layer is deposited. Several prototypes were printed for verifying the numerical buildability predictions, showing acceptable quantitative agreement between theory and experiments. A critical trade-off between structural performance and buildability is exposed, that emphasizes the need for further development of holistic methodologies that integrate structural design, material design and tooling limitations.
Highlights Structural optimization with buildability requirements for 3D concrete printing. Time-dependent strength of fresh concrete is considered by stress constraints. Excessive overhangs are avoided by geometric overlap constraints. Prototypes of a column and a beam are printed without accelerators. The numerical predictions of buildability and the experiments show an acceptable level of agreement.
Design optimization of 3D printed concrete elements considering buildability
https://orcid.org/0000-0002-2871-3286
Abstract In this paper, we propose an integration of 3D concrete printing buildability requirements into a formal structural optimization problem. The aim is to enable the design of a structural element while balancing between its performance as a load-bearing element and its stability during the printing process. Physical buildability is quantified by stress constraints imposed on the fresh concrete, whose time-dependent strength is determined according to a rheological material characterization. This is complemented by geometric buildability that is achieved by imposing constraints on the overlap between layers. The output of optimization is the shape of the structure and the time instance at which each layer is deposited. Several prototypes were printed for verifying the numerical buildability predictions, showing acceptable quantitative agreement between theory and experiments. A critical trade-off between structural performance and buildability is exposed, that emphasizes the need for further development of holistic methodologies that integrate structural design, material design and tooling limitations.
Highlights Structural optimization with buildability requirements for 3D concrete printing. Time-dependent strength of fresh concrete is considered by stress constraints. Excessive overhangs are avoided by geometric overlap constraints. Prototypes of a column and a beam are printed without accelerators. The numerical predictions of buildability and the experiments show an acceptable level of agreement.
Design optimization of 3D printed concrete elements considering buildability
Mogra, Mihir (author) / Asaf, Ofer (author) / Sprecher, Aaron (author) / Amir, Oded (author)
Engineering Structures ; 294
2023-08-04
Article (Journal)
Electronic Resource
English
Damage-rheology model for predicting 3D printed concrete buildability
| Elsevier | 2023
| UB Braunschweig | 1989