Evaluation of various national greenhouse design standards for wind loading

Kim, Rack-woo; Lee, In-Bok; Yeo, Uk-Hyeon; Lee, Sang-yeon

doi:10.1016/j.biosystemseng.2019.10.004

Cited by 23 publications

(12 citation statements)

References 18 publications

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“…In order to ensure the effectiveness of the ANSYS finite element analysis method used in this study, the analysis results are compared with the literature. Based on the greenhouse load standards from five countries, Kim et al 26 analyzed that the bending moment distribution of single span greenhouse under the combined action of wind load and self-weight by using SAP2000. With the same boundary and load conditions, the greenhouse structure is analyzed by using the modeling method described in this study.…”

Section: Resultsmentioning

confidence: 99%

Dynamic response analysis of a whole steel frame solar greenhouse under wind loads

Wang

Jiang

et al. 2022

Sci Rep

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In recent years, whole steel frame steel greenhouses have become increasingly prevalent. With the characteristics of large flexibility and small mass, whole steel frame steel greenhouses are sensitive to wind loads. However, studies on the safety of whole steel frame steel greenhouses under wind loads are still limited. In this study, a 10 m span whole steel frame solar greenhouse was taken as the research objective. Taking the Davenport spectrum as the target spectrum, the time history of the wind speed was simulated by the harmonic superposition method. The finite element model of the greenhouse structure was established using ANSYS software. The simulated wind pressure was applied on the greenhouse structure for dynamic response analysis. The dynamic response results were compared with the static analysis results under average wind load. The results showed that the greenhouse structure mainly bears bending stress under wind load. The bending stress, axial stress and displacement of the greenhouse skeleton under average wind loads are lower than those under instantaneous wind loads. It is necessary to consider the dynamic characteristics of wind loads in the design of solar greenhouses. A wind-induced vibration coefficient is obtained, which can be used to convert the dynamic load into the equivalent static load and improve its design efficiency.

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Section: Resultsmentioning

confidence: 99%

Dynamic response analysis of a whole steel frame solar greenhouse under wind loads

Wang

Jiang

et al. 2022

Sci Rep

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“…(19) if i ∈ R f then (20) superimposing Step 8, Calculate acceleration of the investigated lump € u i in equation ( 6), € w i in equation ( 7), angular acceleration € θ i in equation (8). (21) end if (22) Calculate velocity _…”

Section: Advances In Civil Engineeringmentioning

confidence: 99%

“…e equivalent stress and displacement of some components exceed the allowable range, and the safety of greenhouse structures is mainly controlled by their strength and rigidity [20]. e maximum bending moment of single-span arched greenhouses appears at the bottom of the windward side wall [21].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response Analyses of Plastic Greenhouse Structure considering Fluctuating Wind Load

Jiang

Bai

Wang

et al. 2021

Advances in Civil Engineering

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Wind load is one of the main factors of plastic greenhouse collapse. To solve the dynamic response problem of greenhouses under wind load and determine the dangerous section of a skeleton structure, the investigated lump method is presented for the dynamic response analysis of a plastic greenhouse, considering pulsating wind on the basis of Timoshenko beam theory. First, the investigated lump is designed according to the Timoshenko beam microbody concept. On the basis of Timoshenko beam theory, the governing equations of the skeleton structure of the greenhouse are derived, and the realization process of the algorithm is also provided. Second, the accuracy and effectiveness of the proposed numerical method are verified by an example in which the bending wave of a variable cross section beam with free ends propagates. Finally, the dynamic response of the steel skeletons of plastic greenhouses is analyzed under the effect of the simulation wind speed, and the spatial distribution of the maximum node displacement and the section maximum stress of the steel skeleton are obtained. Computational results show that the displacement peak is near the top of the plastic greenhouse. The most dangerous section of the top chord in the steel skeleton is near the leeward bottom, which has a maximum stress of 219.4 MPa, and the most dangerous section of the bottom chord is near the 1 m height on the leeward side of the plastic greenhouse, which has a maximum stress of 248.5 MPa. Bending stress is the main factor of the rapid increase of stress at the bottom of the skeleton. The maximum node displacement and cross-sectional stress caused by fluctuating wind loads are higher than those caused by average wind loads. The fluctuating wind load should be considered in the wind-induced response analyses of plastic greenhouses.

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“…Whether quasi-static or fluctuating wind pressure design method, it must start with wind loads [27] . In the calculation of wind loads, the Cp, which is defined as the ratio of static pressure difference to the design velocity pressure, is essential [28][29][30] . The rationality of the value can directly affect the safety and economy of greenhouses [31] .…”

Section: Introduction mentioning

confidence: 99%

Wind pressure acting on greenhouses: A review

Nan¹,

Wang²,

Bai³

et al. 2021

International Journal of Agricultural and Biological Engineering

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Greenhouses are widely used in agricultural and horticultural production. With the characteristics of lightweight, small stiffness and high flexibility, greenhouses are sensitive to wind loads. In the calculation of wind loads, the wind pressure coefficient (Cp) is essential. The rationality of the value directly affects the safety and economy of greenhouses. Therefore, the Cp values estimation is one of the most important issues in the design of greenhouses. In order to make full use of the existing research results, in this study, three main methods for estimating Cp values were analyzed, namely, full-scale field experiment, wind tunnel experiment and numerical simulation. Five factors influencing the Cp values were then reviewed including greenhouse design parameters, greenhouse group, overhanging eaves, ventilation and wind direction. Based on the existing researches, suggestions for future development and research work were also put forward. Owing to the flexibility and deformability of greenhouses, the fluid-solid coupling method should be used to analyze the effects of vibrations on wind pressures. The interaction of building parameters (such as the number of spans, ridge height, roof shape and slope angle) and terrain around the greenhouse should be taken into consideration comprehensively. The destructive vortices occurred on the greenhouse should be further investigated.

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Evaluation of various national greenhouse design standards for wind loading

Cited by 23 publications

References 18 publications

Dynamic response analysis of a whole steel frame solar greenhouse under wind loads

Dynamic response analysis of a whole steel frame solar greenhouse under wind loads

Dynamic Response Analyses of Plastic Greenhouse Structure considering Fluctuating Wind Load

Wind pressure acting on greenhouses: A review

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