Comparison of optimal designs of steel portal frames including topological asymmetry considering rolled, fabricated and tapered sections

McKinstray, Ross; Lim, James B.P.; Tanyimboh, Tiku T.; Phan, Duoc T.; Sha, Wei

doi:10.1016/j.engstruct.2015.12.028

Cited by 21 publications

(6 citation statements)

References 19 publications

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“…Despite a greenhouse structure requires a 3D definition to include the influence of the external loads as well as the effect of the structural elements responsible for the connections (i.e., purlins and gutters), Briassoulis et al [33] demonstrated that the study of the main planes (two-dimensional (2D) analysis) was a valid approach in the assessment of greenhouses. In fact, such simplification has been commonly employed in both industrial and agricultural constructions [59][60][61][62][63]. In the same way, Ren et al [47] also performed a similar simplification by means of 3D models in order to decrease the computational cost.…”

Section: Geometrymentioning

confidence: 99%

Numerical Simulation of Multi-Span Greenhouse Structures

et al. 2020

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Greenhouses had to be designed to sustain permanent maintenance and crop loads as well as the site-specific climatic conditions, with wind being the most damaging. However, both the structure and foundation are regularly empirically calculated, which could lead to structural inadequacies or cost ineffectiveness. Thus, in this paper, the structural assessment of a multi-tunnel greenhouse was carried out. Firstly, wind loads were assessed through computational fluid dynamics (CFD). Then, the buckling failure mode when either the European Standard (EN) or the CFD wind loads were contemplated was assessed by a finite element method (FEM). Conversely to the EN 13031-1, CFD wind loads generated a suction in the 0–55° region of the first tunnel and a 60% reduction of the external pressure coefficients in the third tunnel was not detected. Moreover, the first-order buckling eigenvalues were reduced (32–57%), which resulted in the need for a different calculation method (i.e., elastoplastic analysis), and global buckling modes similar to local buckling shape were detected. Finally, the foundation was studied by the FEM and a matrix method based on the Wrinkler model. The stresses and deformations arising from the proposed matrix method were conservative compared to those obtained by the FEM.

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Section: Geometrymentioning

confidence: 99%

Numerical Simulation of Multi-Span Greenhouse Structures

et al. 2020

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“…In terms of optimisation at the frame level, most of the previous studies have been conducted for portal frames composed of hot-rolled steel sections (e.g. (McKinstray et al, 2015, McKinstray et al, 2016). As a rare exception, Phan et al (2019) developed a coupled element and structural level optimisation framework to improve the structural performance of CFS portal frames at the serviceability and ultimate limit states.…”

Section: Introductionmentioning

confidence: 99%

Structural Size Optimization of Single and Built-Up Cold-Formed Steel Beam-Column Members

2021

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The use of cold-formed steel elements in residential and industrial buildings is widely gaining popularity due to their ability to provide cost-effective and sustainable solutions. A high degree of flexibility in the manufacturing of various cross-sectional shapes provides a unique opportunity to further improve the load-carrying capacity of these elements through an optimisation process, leading to more efficient and economical structural systems. This paper aims to offer a practical methodology for the optimum design of CFS beam-column members with different lengths and thicknesses, subject to various combinations of axial compression and bending moment, but with constant material use.The optimisation process is carried out using a Genetic Algorithm and aims to maximise the resistances of CFS members, determined according to the Eurocode 3 design guidelines. Six initial prototype crosssections, including both single and built-up channel sections, are selected and their relative dimensions and edge stiffener configurations are allowed to vary during the optimisation process. To ensure practically relevant solutions EC3 slenderness constraints, as well as a range of practical manufacturing and construction limitations, are imposed on the cross-sections. Standard commercially available single and back-to-back lipped channel sections are taken as the starting points of the optimisation and used to benchmark the efficiency of the optimised sections. Significant gains in capacity (of up to 156 % in the present study) can be obtained compared to the initial cross-sections, while the optimisation results also offer further insights on the material efficiency achievable with various cross-sectional shapes in combined loading scenarios ranging from pure bending to pure compression.

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“…McKinstray et al [21] optimally designed the single-span industrial steel frames. In which three types of sections (rolled, fabricated and non-prismatic) were used in the frames.…”

Section: Introductionmentioning

confidence: 99%

An integrated method for sustainable performance-based optimal seismic design of RC frames with non-prismatic beams

2021

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In the performance-based optimal seismic design, one attempts to obtain structural design variables to meet the minimum objective function satisfying the strength-based and performance-based constraints. A limited number of studies have been conducted on the performance-based optimal seismic design of reinforced concrete frames. On the other hand, due to the importance of environmental impacts, further study is necessary for the design of RC buildings with the aim of reducing CO2 emissions. In this study, a computational procedure is developed for performance-based optimal seismic design of RC frames with prismatic beams and frames with non-prismatic beams. The objective functions consist of minimizing the cost and CO2 emissions. Nonlinear pushover analysis is performed for analysis of the frames. The described procedure is applied to a 4-story reinforced concrete frame and the relationship between optimal cost and optimal CO2 emissions is studied for frames with prismatic beams and frames with non-prismatic beams.

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Comparison of optimal designs of steel portal frames including topological asymmetry considering rolled, fabricated and tapered sections

Cited by 21 publications

References 19 publications

Numerical Simulation of Multi-Span Greenhouse Structures

Numerical Simulation of Multi-Span Greenhouse Structures

Structural Size Optimization of Single and Built-Up Cold-Formed Steel Beam-Column Members

An integrated method for sustainable performance-based optimal seismic design of RC frames with non-prismatic beams

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