Finite element model updating of multi-span greenhouses based on ambient vibration measurements

Ha, Tae-Hyu; Kim, Jinwon; Cho, Bong-Ho; Kim, Dae‐Jin; Jung, Joon Pyo; Shin, Sangsu; Kim, Hong-Jin

doi:10.1016/j.biosystemseng.2017.06.019

Cited by 14 publications

(10 citation statements)

References 15 publications

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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%

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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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Section: Advances In Civil Engineeringmentioning

confidence: 99%

“…e connection modelling condition of the skeleton structure of greenhouses and the addition of the support modelling condition can affect the vibration modes of multispan greenhouses [22]. e fatigue life of greenhouses can be predicted accurately by using a fatigue stress model, considering the dead weight and the wind speed [23].…”

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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“…Therefore, the wind load, as one of the main control loads in the design of greenhouses, plays a crucial role in ensuring the reliability of the structures [7] . However, in order to minimize cost, many greenhouses are usually designed with a lower level of security than general buildings [8][9][10] . In recent years, strong winds caused a large number of greenhouses collapse, resulting in economic losses for agricultural production [11][12][13] .…”

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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“…Most greenhouses are plastic-covered structures, and their structural safety has received attention due to the high economic costs of losses from complete or partial greenhouse collapses caused by severe weather such as wind and snow [2][3][4]. The mechanical performance of different greenhouse structures has been studied by numerical methods [5] and finite elements for static loads [6] and dynamic loads [7]. 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.…”

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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Finite element model updating of multi-span greenhouses based on ambient vibration measurements

Cited by 14 publications

References 15 publications

Dynamic Response Analyses of Plastic Greenhouse Structure considering Fluctuating Wind Load

Dynamic Response Analyses of Plastic Greenhouse Structure considering Fluctuating Wind Load

Wind pressure acting on greenhouses: A review

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

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