Wind load investigation of self-supported lattice transmission tower based on wind tunnel tests

2022 ◽  
Vol 252 ◽  
pp. 113575
Author(s):  
Wentong Zhang ◽  
Yiqing Xiao ◽  
Chao Li ◽  
Qingxing Zheng ◽  
Yanan Tang
Keyword(s):  
Wind Tunnel ◽  
Wind Load ◽  
Transmission Tower ◽  
Wind Tunnel Tests

Wind tunnel tests and dynamic analysis of wind-induced response of a transmission tower on a hill

2021 ◽  
pp. 136943322110339
Author(s):  
Jian Guo ◽  
Changliang Xiao ◽  
Jiantao Li
Keyword(s):  
Wind Tunnel ◽  
Wind Field ◽  
Dynamic Responses ◽  
Interactive Effects ◽  
Induced Response ◽  
Transmission Tower ◽  
Structural Dynamic ◽  
Wind Tunnel Tests ◽  
Hill Slope ◽  
The Hill

A hill with a lattice transmission tower presents complex wind field characteristics. The commonly used computational fluid dynamics (CFD) simulations are difficult to analyze the wind resistance and dynamic responses of the transmission tower due to structural complexity. In this study, wind tunnel tests and numerical simulations are conducted to analyze the wind field of the hill and the dynamic responses of the transmission tower built on it. The hill models with different slopes are investigated by wind tunnel tests to measure the wind field characteristics, such as mean speed and turbulence intensity. The study shows that the existence of a transmission tower reduces the wind speed on the leeward slope significantly but has little effect on the windward slope. To study the dynamic behavior of the transmission tower, a hybrid analysis procedure is used by introducing the measured experimental wind information to the finite element tower model established using ANSYS. The effects of hill slope on the maximum displacement response of the tower are studied. The results show that the maximum value of the response is the largest when the hill slope is 25° compared to those when hill slope is 15° and 35°. The results extend the knowledge concerning wind tunnel tests on hills of different terrain and provide a comprehensive understanding of the interactive effects between the hill and existing transmission tower regarding to the wind field characteristics and structural dynamic responses.

Untersuchungen zur Praxistauglichkeit von CFD-Berechnungen bei der Windlastermittlung auf Bauwerke durch Vergleich mit Windkanalversuchen/Investigations on the practicality of CFD- calculations in wind load determination on buildings by comparison with wind tunnel tests

Bauingenieur ◽  
2018 ◽  
Vol 93 (12) ◽  
pp. 501-511
Author(s):  
R. Timmers ◽  
S. Haibach ◽  
J. Wacker ◽  
M. Ladinek ◽  
A. Niederwanger ◽  
...  
Keyword(s):  
Wind Tunnel ◽  
Wind Load ◽  
Wind Tunnel Tests

Die Ermittlung der Windlastverteilung auf einfachere Bauwerke erfolgt anhand der einschlägigen Normen, wohingegen bei komplexeren Bauwerken Windkanalversuche zielführend sind. Zusätzlich kann die Windlastverteilung prinzipiell auch mittels CFD-Simulationen ermittelt werden. Durch Vereinfachungen im Rechenmodell (RANS, SST) können zwar praxistaugliche Rechenzeiten erreicht werden, als Konsequenz werden aber nur mehr zeitlich gemittelte Windlastbeiwerte berechnet. Im Windkanalversuch hingegen werden Windlastzeitreihen inklusive kurzzeitiger Spitzenwerte gemessen. Es gibt nun Anwendungsfälle, bei welchen der Ingenieur mit den Angaben der Windlastnorm nicht ausreichend versorgt wird, die aber einen Windkanalversuch noch nicht rechtfertigen. Die vorliegenden Untersuchungen beziehen sich speziell auf diese Fälle. In einem ersten Schritt stellt sich daher die Frage, ob mittels CFD (RANS) die Basiswerte, das heißt die zeitlich gemittelten Druck- und Sogbeiwerte mit ausreichender Genauigkeit ermittelt werden können. Hierfür wurden anhand einer scharfkantigen Bauwerksgeometrie die gemittelten Beiwerte im Windkanal als auch mittels CFD ermittelt und verglichen. Zusammenfassend kann gesagt werden, dass die Werte hinsichtlich Vorzeichen und Tendenz relativ gut zusammenstimmen, dass aber teilweise betragsmäßige Abweichungen festgestellt wurden. Mittels CFD (RANS) bestimmte Mittelwerte können für einfachere Geometrien, welche nicht adäquat in der Norm erfasst werden, zwar hilfreich für die Erarbeitung von Windlastannahmen sein, sind aber aufgrund der bestehenden Untersuchungen zumeist nur für Vordimensionierungen oder ähnlichem tauglich.

Wind tunnel tests on wind loads acting on an angled steel triangular transmission tower

2016 ◽  
Vol 156 ◽  
pp. 93-103 ◽  
Author(s):  
Fengli Yang ◽  
Huixue Dang ◽  
Huawei Niu ◽  
Hongjie Zhang ◽  
Binrong Zhu
Keyword(s):  
Wind Tunnel ◽  
Wind Loads ◽  
Transmission Tower ◽  
Wind Tunnel Tests

scholarly journals Characteristics of Wind Load on Spatial Structures with Typical Shapes due to Aerodynamic Geometrical Parameters and Terrain Type

2018 ◽  
Vol 2018 ◽  
pp. 1-18 ◽  
Author(s):  
Yi Zhou ◽  
Yuanqi Li ◽  
Yingying Zhang ◽  
Akihito Yoshida
Keyword(s):  
Wind Tunnel ◽  
Pressure Distribution ◽  
Strong Dependence ◽  
Wind Load ◽  
Wind Pressure ◽  
Geometrical Parameters ◽  
Spatial Structures ◽  
Wind Tunnel Tests ◽  
Terrain Type ◽  
Design Optimum

The characteristics of wind load on large-span roofs are complicated by their unique geometrical configurations and strong dependence on aerodynamic geometrical parameters and terrain type. However, there is rarely comprehensive research for characteristics of wind load on spatial structures due to aerodynamic geometrical parameters of roofs and terrain type. In this study, first, the effects of geometrical parameters of roofs and terrain type on the wind pressure distribution based on the data obtained from the existing wind tunnel tests were summarized. Then, the wind loads of full-scale structures were predicted by CFD, and the efficiency of numerical results was further verified by the available wind tunnel tests on spatial structures. Finally, with comparative analyses of the wind pressure distribution of the roofs predicted by CFD under different cases, the effects of shape ratios, especially rise-span ratio, height-span ratio, length-span ratio, and so on, and terrain type on the wind pressure field of typical spatial structures were presented. It can be beneficial to wind-resistant design of structures and can be provided as reference for aerodynamic design optimum of span spatial structures.

Development and Validation of CFD Analysis Procedure for Predicting Wind Load on Commercial Ships

2019 ◽  
Author(s):  
Sang-Hun Lee ◽  
Sei-Hwan Kim ◽  
Deok-Su Kim ◽  
Young-Bum Lee
Keyword(s):  
Wind Tunnel ◽  
Cfd Simulation ◽  
Numerical Procedure ◽  
Wind Load ◽  
Wind Tunnel Tests ◽  
Open Sea ◽  
Comparison Results ◽  
Development And Validation ◽  
Boundary Layer Mesh ◽  
Oil Tanker

Abstract This paper describes a numerical procedure for the prediction of the wind load on various types of commercial ships, such as LNGC, oil tanker and container ship. As the size of vessels increases, wind load is playing a more important role when sailing in an open sea and mooring at harbors. To estimate wind load, 3D steady RANS CFD simulation is performed and validated with experimental results obtained from wind tunnel tests. The effect of turbulence source is studied to maintain the turbulence intensity profile at the test section of the wind tunnel and the boundary layer mesh is also investigated to improve the accuracy. The discrepancy in force and moment coefficients between CFD results and wind tunnel tests is reduced and the comparison results show good agreements.

WIND LOAD PREDICTION OF LARGE-SPAN DRY COAL SHEDS BASED ON GRNN AND ITS APPLICATION

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Ying Sun ◽  
Lin Yang ◽  
Yue Wu
Keyword(s):  
Wind Tunnel ◽  
Prediction Models ◽  
Peak Frequency ◽  
Wind Load ◽  
Wind Pressure ◽  
Generalized Regression Neural Network ◽  
Load Prediction ◽  
Spectral Parameters ◽  
Wind Tunnel Tests ◽  
Large Span

The distribution and fluctuation of wind load on large-span dry coal sheds are complicated. Wind load on typical shape of roofs can be sometimes determined based on the wind tunnel tests carried out on roofs of similar shape. To expand the application scope of the test data, Generalized Regression Neural Network (GRNN) is introduced. The prediction models on large-span dry coal are given, where the wind load is expressed by eight parameters: mean, RMS, skewness, kurtosis of wind pressure coefficients, three auto-spectral parameters (including descendent slope in high frequency range, peak reduced spectrum and reduced peak frequency) and coherence exponent for cross-spectra. Cross validation and trails are carried out to determine the parameter in the GRNN model. Further, the wind load prediction is applied on a dry coal shed shell. The wind-induced responses are calculated and compared with the results of wind tunnel tests, with extremely close result. Therefore, it can be concluded that GRNN is feasible in predicting wind load on roof structures.

scholarly journals Wind Tunnel Tests for Wind Pressure Distribution on Gable Roof Buildings

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Xiao-kun Jing ◽  
Yuan-qi Li
Keyword(s):  
Wind Tunnel ◽  
Pressure Field ◽  
Wind Load ◽  
Wind Pressure ◽  
Strong Wind ◽  
Load Path ◽  
Wind Tunnel Tests ◽  
Pressure Distributions ◽  
Gable Roof ◽  
Aspect Ratios

Gable roof buildings are widely used in industrial buildings. Based on wind tunnel tests with rigid models, wind pressure distributions on gable roof buildings with different aspect ratios were measured simultaneously. Some characteristics of the measured wind pressure field on the surfaces of the models were analyzed, including mean wind pressure, fluctuating wind pressure, peak negative wind pressure, and characteristics of proper orthogonal decomposition results of the measured wind pressure field. The results show that extremely high local suctions often occur in the leading edges of longitudinal wall and windward roof, roof corner, and roof ridge which are the severe damaged locations under strong wind. The aspect ratio of building has a certain effect on the mean wind pressure coefficients, and the effect relates to wind attack angle. Compared with experimental results, the region division of roof corner and roof ridge from AIJ2004 is more reasonable than those from CECS102:2002 and MBMA2006.The contributions of the first several eigenvectors to the overall wind pressure distributions become much bigger. The investigation can offer some basic understanding for estimating wind load distribution on gable roof buildings and facilitate wind-resistant design of cladding components and their connections considering wind load path.

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