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

Abstract

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.

The Hay Inclined Plane in Coalbrookdale (Shropshire, England): Analysis through Computer-Aided Engineering

“…The wheel was solidly attached to the DD axle (17), which had two gears. The distal gear, which was the smaller gear, was coupled to the CC gear (19), which was the larger gear, which was solidly attached to axle AA, so that for each turn of the inertia flywheel the AA axle rotated 0.098 times in the opposite direction.…”

“…The ultimate goal of this research is to perform a static analysis [19] of the Hay inclined plane using the finite element method (FEM) [20] under real operating conditions, in order to determine whether it was well dimensioned and functioned properly. Its scientific interest lies in the fact that from the point of view of industrial archaeology and the study of technical historical heritage, there is no existing study, worldwide, on this outstanding example of industrial historical heritage, which marked a historic milestone in the Industrial Revolution (1760-1840).…”

Agustin de Betancourt’s Mechanical Dredger in the Port of Kronstadt: Analysis through Computer-Aided Engineering

“…As mentioned before, the main shaft moves two parallel secondary axes (21 and 10) of similar characteristics and does so thanks to the set of straight gears. These are two simple axes that have at their ends a crown (23) that meshes with the auxiliary crowns (6), and a wheel (20) that serves as support for the friction drum.…”

“…The objective of this research is to carry out a static analysis [6] using the finite element method [7] under operating conditions of the dredging machine in order to determine if it was well dimensioned and functional. It therefore follows the research line of other studies carried out by the authors on other historical inventions of Agustín de Betancourt [8][9][10].…”

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

“…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.…”