Mode shape correction for wind-induced dynamic responses of tall buildings using time-domain computation and wind tunnel tests

2009 ◽  
Vol 322 (4-5) ◽  
pp. 740-755 ◽  
Author(s):  
K.M. Lam ◽  
A. Li
Keyword(s):  
Wind Tunnel ◽  
Mode Shape ◽  
Time Domain ◽  
Tall Buildings ◽  
Dynamic Responses ◽  
Wind Tunnel Tests ◽  
Shape Correction

Mode shape corrections for wind tunnel tests of tall buildings

1993 ◽  
Vol 15 (5) ◽  
pp. 387-392 ◽  
Author(s):  
Y.L. Xu ◽  
K.C.S. Kwok
Keyword(s):  
Wind Tunnel ◽  
Mode Shape ◽  
Tall Buildings ◽  
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.

Spectral Characteristics and Correlation of Dynamic Wind Loads of a Typical Super-Tall Building

2013 ◽  
Vol 351-352 ◽  
pp. 347-350
Author(s):  
Lun Hai Zhi
Keyword(s):  
Wind Tunnel ◽  
Empirical Formula ◽  
Spectral Characteristics ◽  
Tall Buildings ◽  
Tall Building ◽  
Wind Loads ◽  
Wind Loading ◽  
Wind Tunnel Tests ◽  
Cross Correlations ◽  
Overturning Moment

This paper present some selected results of wind tunnel tests carried out on a typical super-tall building The variations of wind loads in the three orthogonal directions with wind attack direction were evaluated. The cross-correlations among various wind loading components were presented and discussed in detail. Furthermore, the across-wind spectral characteristics were studied and an empirical formula for estimation of the across-wind overturning moment spectrum for the super-tall building is presented. The output of this study is expected to be of considerable interest and practical use to professionals and researchers involved in the design of super-tall buildings.

Wind tunnel tests of 3D wind loads on tall buildings based on torsional motion-induced vibrations

2016 ◽  
Vol 23 (3) ◽  
pp. 231-251
Author(s):  
Lianghao Zou ◽  
Guoji Xu ◽  
C.S. Cai ◽  
Shuguo Liang
Keyword(s):  
Wind Tunnel ◽  
Tall Buildings ◽  
Wind Loads ◽  
Torsional Motion ◽  
Wind Tunnel Tests

Wind-induced torsional loads on buildings

1992 ◽  
Vol 19 (4) ◽  
pp. 711-723
Author(s):  
G. R. Lythe ◽  
D. Surry
Keyword(s):  
Wind Tunnel ◽  
Data Base ◽  
Peak Load ◽  
Estimation Method ◽  
Tall Buildings ◽  
Large Data ◽  
Wind Loading ◽  
Wind Tunnel Tests ◽  
Torsional Loads ◽  
The Mean

This paper examines the mean and peak torsional wind loads on tall buildings using two data bases of torsion measured experimentally in wind tunnel tests: the first, a large data base of mean torsional loads; and the second, a smaller data base of peak torsions. Although the mean load constitutes only a part of the total peak load required for design, it provides considerable insight into the aerodynamics of torsion, while improvement in its estimation also improves the estimation of the total peak load, using empirical gust factor methods. Comparisons between experimental results and the corresponding provisions of the 1985 National Building Code of Canada and Commentary indicate that, while the NBCC is a good estimator of mean shear loads, it significantly underestimates the mean torsional loads on tall buildings. The experimental data are further analysed to provide an improved estimation method for both the mean and the peak torsion. For mean torsion, this involves evaluating various definitions of the torsion coefficient and classifying building shapes in order to decrease the variability of the associated coefficients. This process leads to some notion of those shapes susceptible to large torsional loads and the most important building parameters on which to base predictions. This insight, along with the data base of peak torsion, is used to simplify and improve an existing method for estimating peak torsion, which was developed using a smaller data base. Key words: torsion, wind loading, codes, wind tunnel tests, tall buildings.

Aeroelastic Vibration of Super-Tall Buildings

2014 ◽  
Vol 1025-1026 ◽  
pp. 914-917
Author(s):  
Yong Chul Kim ◽  
Sung Won Yoon
Keyword(s):  
Magnetic Field ◽  
Wind Tunnel ◽  
Wind Direction ◽  
Natural Frequencies ◽  
Tall Buildings ◽  
Spring Stiffness ◽  
Wind Tunnel Tests ◽  
Test Models ◽  
Tip Displacement

Aeroelastic wind tunnel tests were conducted on conventional and tapered super-tall buildings to investigate the effect of the taper on the aeroelastic behavior for various wind directions and normalized velocities, with a focus on the maximum tip displacement. The natural frequencies and damping ratios were adjusted by means of the spring stiffness and magnetic field at the bottom of the test models. The displacements at the bottom of the test models were measured and transformed to tip displacements. The results showed that the taper suppressed the maximum tip displacement in both the X and Y directions, although the suppression was greater in the Y direction, especially for small wind directions. Moreover, the variations of the maximum tip displacement in the X direction with the wind direction and normalized velocity were small.

Silver Tower Brussels – Adaptative outriggers

2021 ◽  
Author(s):  
Luis Nosiglia ◽  
Amaury Leroy ◽  
Vincent de Ville de Goyet
Keyword(s):  
Wind Tunnel ◽  
Dynamic Response ◽  
Tall Buildings ◽  
Lateral Stiffness ◽  
Technical Aspects ◽  
Wind Tunnel Tests ◽  
The Core ◽  
New Applications ◽  
Lock In ◽  
Elegant Solution

<p>Outrigger systems are commonly used in the design of tall buildings to increase their lateral stiffness and resistance capacity. Recently, new applications for outrigger systems have appeared, such as providing additional damping or acting as fuses under earthquake conditions. While their main purpose varies from one project to another, the problem related to differential displacements between the core and the peripheral columns remains a constant.</p><p>This paper aims at exploring various technical aspects considered in the design of the Silver Tower (Brussels) and, more specifically, the design of its outrigger system. It will show how the proposed system presents an effective and elegant solution to free the outrigger system of the lock-in forces due to differential settlements. Also, aspects related to the foundation system, the performed wind tunnel tests and the dynamic response of the tower will be discussed.</p>

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