Title
Wind loads for stability design of large multi-span duo-pitch greenhouses
Author
Bronkhorst, A.J.
Geurts, C.P.W.
van Bentum, C.A.
van der Knaap, L.P.M.
Pertermann, I.
Publication year
2017
Abstract
An atmospheric boundary layer wind tunnel study was performed to determine the overall horizontal wind load on multi-span duo-pitch greenhouses. The results of this study are intended for the stability design of inflexible Gladding system greenhouses (designated as Class A in EN 13031-1) with roof pitch angles of 23-24' and ridge heights of 7.5-8 m. Both static force and fluctuating pressure measurements were performed to determine the overall horizontal wind force. The results obtained with the static force measurements show that the overall horizontal wind force increases linearly with increasing number of spans. The overall horizontal wind load determined with the mean pressure coefficients derived from the fluctuating pressure measurements was found to be in good agreement with the static force measurements. An investigation into the correlation of the roof pressures showed that these pressures are relatively little correlated. The overall horizontal force on the roof of multi-span buildings reduces significantly because of this lack of correlation. Accounting for the lack of correlation between the roof pressures on a 30span model resulted in a 65% reduction of the peak horizontal wind force on the roof. A comparison was made of the overall horizontal wind forces determined in the current study and calculated with European codes for wind load assessment on greenhouses. EN 13031-1 provides non-conservative outcomes for the overall horizontal wind force on the investigated duo-pitch greenhouse type with more than 30 spans. On the other hand, EN 1991-1-4 is increasingly conservative with larger number of spans.
Subject
Static wind loads
Multi-span duo-pitch greenhouses
Stability design
Wind tunnel measurements
Force and pressure coefficients
Correlation of wind pressures
Size factor
Dynamic coefficient
Buildings and Infrastructures
Urbanisation
Fluid & Solid Mechanics
SD - Structural Dynamics
TS - Technical Sciences
To reference this document use:
http://resolver.tudelft.nl/uuid:8a57b58e-1b23-4a2a-bd92-5cf0dbec2a28
TNO identifier
749679
Source
Frontiers in Built Environment, 3 (3), 1-21
Document type
article