Numerical study on static properties and failure mechanisms of landing assembled Chinese solar greenhouses

Jiang, Yingchun; Bai, Yanchao; Wang, Tieliang

doi:10.1016/j.compag.2021.106347

Cited by 10 publications

(4 citation statements)

References 13 publications

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“…Notably, L u and L f were positively correlated with the sectional modulus of the tubes. Wang et al [31] found the same results on an 8.0 m span solar greenhouse frame. Thus, it is recommended to select the cross-section shape of tubes with the larger section modulus.…”

Section: Discussionsupporting

confidence: 58%

“…The fruit vegetable crops grown in solar greenhouses are typically suspended using wires supported by frames, resulting in concentrated forces exerted on the frames due to the weight of the crops. Although the crop loads were considered in the research conducted by Liu et al [7], Ding et al [30], and Wang et al [31], the influence of crop loads on L u and L u of solar greenhouse frames were not explored. In this study, it was found that the crop loads decreased both L u and L f under snow.…”

Section: Data Availability Statementmentioning

confidence: 99%

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Numerical Simulation of Structural Performance in a Single-Tube Frame for 12 m-Span Chinese Solar Greenhouses Subjected to Snow Loads

Li,

Wei,

Zhao

et al. 2024

Agronomy

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To address the structural concerns of a 12.0 m-span landing assembled single-tube frame (LASF) for Chinese solar greenhouses subjected to snow loads, the internal forces and deformations of LASF and its reinforced counterpart (RLASF) were numerically simulated to determine the ultimate bearing capacities (Lu) and the failure loads (Lf). During the simulations, steel tubes were modeled as beam188 elements and cables as link180 elements. The frame constraints and the connections were assumed to be fixed supports and rigid, respectively. The loads were determined according to the Chinese standard (GB51183-2016). Simulations revealed that the LASF and RLASF primarily withstand bending moments and are prone to strength failures under snow loads. Both exhibited lower Lu and Lf under non-uniform snow loads than under uniform snow loads. The results also indicated that crop loads could deteriorate the structural safety of the LASF and RLASF. Lu and Lf were found to be proportional to the section modulus of the tubes. The effects of wind loads and initial geometry imperfections on Lf of the LASF and RLASF can be neglected. Furthermore, the RLASF exhibited higher Lf compared to the LASF. Steel usage of the RLASF could be further reduced by replacing circular tubes with rectangular tubes, making the RLASF a feasible option for constructing Chinese solar greenhouses.

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Section: Discussionsupporting

confidence: 58%

Section: Data Availability Statementmentioning

confidence: 99%

Numerical Simulation of Structural Performance in a Single-Tube Frame for 12 m-Span Chinese Solar Greenhouses Subjected to Snow Loads

Li,

Wei,

Zhao

et al. 2024

Agronomy

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“…However, heavy snowfall during winter in the middle and high latitudes causes snow accumulation in CSGs [1][2][3]. The snow accumulation on the front roof of CSGs results in low crop yield, mechanical damage, or greenhouse collapse [4,5]. The general construction of a CSG is depicted in Figure 1a, which shows the south roof, back slope, back wall, and side walls [6].…”

Section: Introductionmentioning

confidence: 99%

Scissor Arm for Cambered Snow: Mechanical Theory

Gang,

Gong,

et al. 2024

Machines

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In this study, a novel cambered snow removal device is designed to achieve automatic snow removal in large curved areas, such as the south roof of a Chinese solar greenhouse. The theory of structural parameters and shear force is ambiguous. People are not based on the greenhouse structure parameters for the selection of snow removal devices. Therefore, the quantitative relationship between the structure of the greenhouse span and the number of scissor arm-length knots is analysed, and the relationship between the material strength and application distance is determined. This study’s objectives are (1) to establish a theoretical model of scissor arm motion and (2) to analyse the force distribution of the scissor arm using multi-body dynamics. The results show that the scissor arm of a round-arch greenhouse has fewer sections but a larger arm length, whereas the scissor arm of a traditional solar greenhouse has more sections but a smaller arm length. Based on the shear force of the scissor structure, the optimised wall thickness reduces the force of the node by 17%.

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“…There has been little theoretical analysis on the whole framework greenhouse structures. Only Wang et al 20 studied the static properties and failure mechanisms of this type of greenhouse. However, this study only established a single plane model.…”

Section: Introductionmentioning

confidence: 99%

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

Wang

Jiang

et al. 2022

Sci Rep

Self Cite

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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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Numerical study on static properties and failure mechanisms of landing assembled Chinese solar greenhouses

Cited by 10 publications

References 13 publications

Numerical Simulation of Structural Performance in a Single-Tube Frame for 12 m-Span Chinese Solar Greenhouses Subjected to Snow Loads

Numerical Simulation of Structural Performance in a Single-Tube Frame for 12 m-Span Chinese Solar Greenhouses Subjected to Snow Loads

Scissor Arm for Cambered Snow: Mechanical Theory

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

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