Design optimization of steel portal frames

Hernández, Santiago; Fontán, Arturo; Perezzan, Juan Carlos; Loscos, Pablo

doi:10.1016/j.advengsoft.2005.03.006

Cited by 22 publications

(11 citation statements)

References 2 publications

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“…In addition, the study of the influence of joint stiffness on buckling lengths is interesting for further research. Table 2 Dimensions and section properties of cold-formed steel channel sections Table 3 Parameters used in calculations of diaphragm roof characteristic Table 4 Shear properties of panels (a) 6 m frame spacing; (b) 4 m frame spacing Table 5 Mechanical properties of fasteners (after BS 5950-Part 9 Table 5 [13]) Table 6 Optimal solutions for frame spacing of 6 m (a) Stressed-skin action not considered; (b) Influence of stressed-skin action pertaining to cladding thickness of 0.5 mm; (c) Influence of stressed-skin action pertaining to cladding thickness of 0.7 mm Table 7 Optimal solutions for frame spacing of 4 m (a) Stressed-skin action not considered; (b) Influence of stressed-skin action pertaining to cladding thickness of 0.5 mm; (c) Influence of stressed-skin action pertaining to cladding thickness of 0.7 mm Table 5 Mechanical properties of fasteners (after BS 5950-Part 9 Note: Gable frames assumed to braced and sheeted and so idealised as stiff and rigid in plane [7]. …”

Section: Discussionmentioning

confidence: 99%

“…As the joints were assumed rigid, the cost of the brackets was not included in the design optimization. In the optimum design of steel portal frames, many studies focused on designing portal frames using hot-rolled rather than cold-formed steel, in which genetic algorithm was successfully adopted as an optimizer [3][4][5], as well as other methods, such as nonlinear programming, sequential algorithm [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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Optimal design of cold-formed steel portal frames for stressed-skin action using genetic algorithm

Phan¹,

Lim²,

Tanyimboh³

et al. 2015

Engineering Structures

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, R. M. (2015). Optimal design of cold-formed steel portal frames for stressed-skin action using genetic algorithm. Engineering Structures, 93, 36-49. DOI: 10.1016/j.engstruct.2015 Optimal design of cold-formed steel portal frames for stressed-skin action using genetic algorithm This paper describes a stressed-skin diaphragm approach to the optimal design of the internal frame of a cold-formed steel portal framing system, in conjunction with the effect of semi-rigid joints. Both ultimate and serviceability limit states are considered. Wind load combinations are included. The designs are optimized using a real-coded niching genetic algorithm, in which both discrete and continuous decision variables are processed. For a building with two internal frames, it is shown that the material cost of the internal frame can be reduced by as much as 53%, compared with a design that ignores stressed-skin action.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimal design of cold-formed steel portal frames for stressed-skin action using genetic algorithm

Phan¹,

Lim²,

Tanyimboh³

et al. 2015

Engineering Structures

View full text Add to dashboard Cite

show abstract

“…Recently, Saka [8] has considered an optimum design of pitched roof steel frames with haunched rafters by using a genetic algorithm. One of the latest researches reported in this field is the work of Hernández et al [9], where authors have considered minimum weight design of steel portal frames with software developed for structural optimization. This paper introduces the simultaneous cost, topology and standard discrete sizes optimization of a single-storey industrial steel building structure.…”

Section: Single-storey Industrial Steel Buildingmentioning

confidence: 99%

MINLP cost optimization of industrial steel building

Kravanja¹,

Žula²

2007

WIT Transactions on the Built Environment, Vol 91

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This paper presents the cost optimization of a single-storey industrial steel building structure. The optimization is performed by the Mixed-Integer Non-linear programming approach, MINLP. The structure consists of the main portal frames, which are mutually connected with the purlins. All structural elements are proposed to be built up of standard hot rolled I sections. The MINLP performs the simultaneous cost, topology and discrete sizes optimization of the building structure. Since the discrete/continuous optimization problem is non-convex and highly non-linear, the Modified Outer-Approximation/EqualityRelaxation (OA/ER) algorithm has been used for the optimization. Alongside the optimal structure's costs, the optimal number of main portal frames and purlins as well as all standard cross-section sizes have been obtained.

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“…Recently, Saka [4] has considered an optimum design of pitched roof steel frames with haunched rafters by using a genetic algorithm. One of the latest researches reported in this field is the work of Hernández et al [5], where the authors have considered a minimum weight design of the steel portal frames with software developed for the structural optimization. It should be noted that all the mentioned authors deal with the discrete sizes optimization at fixed structural topologies.…”

Section: Introductionmentioning

confidence: 99%

The two-phase MINLP optimization of a single-storey industrial steel building

Žula

Kravanja

2008

WIT Transactions on the Built Environment

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The paper presents the two-phase MINLP topology and standard sizes optimization of a single-storey industrial steel building. The structure consists of main portal frames, connected with purlins. It is made from standard hot rolled I sections. The Mixed-Integer Non-Linear Programming (MINLP) optimization of the structure is applied. The MINLP performs a discrete topology and standard dimension optimization, while continuous parameters (stresses, deflections, mass, costs, etc.) are calculated simultaneously inside the continuous space. Since the discrete/continuous optimization problem of this type of structures is non-convex and highly non-linear, the Modified Outer-Approximation/EqualityRelaxation (OA/ER) algorithm is used for the optimization. The defined mass objective function is subjected to the set of equality and inequality constraints known from the structural analysis and dimensioning. The dimensioning of steel members is performed in accordance with Eurocode 3.The MINLP optimization is performed in two phases. In the first phase, the topology optimization of the structure at the relaxed dimensions is performed only. This phase gives a good linear global approximation to the structure for the next phase. When the optimal topology is reached, the optimization is continued at the second phase for the overall topology and standard section discrete optimization. Alongside the optimal structure mass, the optimal topology with the optimal number of portal frames and purlins as well as all standard crosssections are obtained. The paper includes the theoretical basis and a practical example with the results of the optimization.

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Design optimization of steel portal frames

Cited by 22 publications

References 2 publications

Optimal design of cold-formed steel portal frames for stressed-skin action using genetic algorithm

Optimal design of cold-formed steel portal frames for stressed-skin action using genetic algorithm

MINLP cost optimization of industrial steel building

The two-phase MINLP optimization of a single-storey industrial steel building

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