Wind Loads for Stability Design of Large Multi-Span Duo-Pitch Greenhouses

Bronkhorst, A.J.; Geurts, C.P.W.; Bentum, C.A. van; Knaap, L.P.M. van der; Pertermann, Ina

doi:10.3389/fbuil.2017.00018

Cited by 9 publications

(16 citation statements)

References 8 publications

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“…Furthermore, a fluid dynamics analysis is conducted for the actual model, and the pressure coefficient for wind load is compared with the EN1991-1-4 standard, as shown in Table 4. The pressure coefficient is calculated using Equation (4) [6] …”

Section: Resultsmentioning

confidence: 99%

“…In addition, Ajit K. Nayak evaluated the wind load on greenhouses, in addition to their structural stability [5]. Furthermore, A. J. Bronkhorst et al investigated wind load for the stability design of a duo-pitch-shaped greenhouse [6]. B. von Elsner et al examined the structural and functional characteristics of greenhouses based on the design requirements of the EU [7].…”

Section: Introductionmentioning

confidence: 99%

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Fatigue Analysis of Greenhouse Structure under Wind Load and Self-Weight

Hur

Kwon

2017

Applied Sciences

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Abstract:The design strength of a greenhouse structure is generally determined by analyzing strength after applying wind load using the wind pressure coefficient according to a design guide. Until now, the stability analysis for wind load has been performed through static structural analysis. However, a greenhouse is subjected to dynamic wind loads of various amplitudes, and it is reasonable to judge stability through fatigue analysis. For fatigue analysis, a stress-normalized model was constructed based on the square of wind speed, and the value obtained by squaring wind speed was used as dynamic load time data. Life cycle was calculated under stress generated by self-weight by compensating fatigue estimation stress. Furthermore, the effect of self-weight was examined and errors of up to 21% were obtained depending on the configuration of the stress-normalized model. When self-weight and wind speed were applied simultaneously, the effect of self-weight reduced when the stress-normalized model was used at high wind speed. Therefore, it is appropriate that the fatigue analysis is based on the fatigue stress model normalized by the square of wind speed, fatigue estimation stress is corrected to the static stress due to self-weight, and the square of wind speed is used as the dynamic load.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fatigue Analysis of Greenhouse Structure under Wind Load and Self-Weight

Hur

Kwon

2017

Applied Sciences

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“…On the contrary, to date, the number of research works related to the structural calculation of greenhouses is more limited. There are some studies based on the structural analysis of greenhouses [22,24,[33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49], whereas, to the best of the authors' knowledge, only one paper focused on the analysis of foundations in greenhouses [50].…”

Section: Introductionmentioning

confidence: 99%

“…Among the literature, wind loads are reported as one of the principal sources for damage and failure of lightweight greenhouses structures [34,39,44,[54][55][56]. In fact, as lightweight structures located in the Mediterranean Basin, both the dead and snow load are low, whereas wind load is the predominant design factor.…”

Section: Introductionmentioning

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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“…For this type of structure, there are few real data that can be used to validate calculation models [8,9], due to the high economic cost of monitoring structural performance. Some types of greenhouses with inflexible cladding have been tested on a small scale in wind tunnels to obtain the pressure coefficients on multi-span duo-pitch roofs [10] or single-span roofs with different geometries [11]. Numerical calculations have primarily been experimentally verified with small models [12,13] and simple loads [14], which do not reflect the mechanical performance under complex loads [15].…”

Section: Introductionmentioning

confidence: 99%

Design and Testing of a Structural Monitoring System in an Almería-Type Tensioned Structure Greenhouse

Peña

Peralta

Marín

2020

Sensors

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Greenhouse cultivation has gained a special importance in recent years and become the basis of the economy in south-eastern Spain. The structures used are light and, due to weather events, often collapse completely or partially, which has generated interest in the study of these unique buildings. This study presents a load and displacement monitoring system that was designed, and full scale tested, in an Almería-type greenhouse with a tensioned wire structure. The loads and displacements measured under real load conditions were recorded for multiple time periods. The traction force on the roof cables decreased up to 22% for a temperature increase of 30 °C, and the compression force decreased up to 16.1% on the columns or pillars for a temperature and wind speed increase of 25.8 °C and 1.9 m/s respectively. The results show that the structure is susceptible to daily temperature changes and, to a lesser extent, wind throughout the test. The monitoring system, which uses load cells to measure loads and machine vision techniques to measure displacements, is appropriate for use in different types of greenhouses.

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Wind Loads for Stability Design of Large Multi-Span Duo-Pitch Greenhouses

Cited by 9 publications

References 8 publications

Fatigue Analysis of Greenhouse Structure under Wind Load and Self-Weight

Fatigue Analysis of Greenhouse Structure under Wind Load and Self-Weight

Numerical Simulation of Multi-Span Greenhouse Structures

Design and Testing of a Structural Monitoring System in an Almería-Type Tensioned Structure Greenhouse

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