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>

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.

scholarly journals Study on Behaviour of Outrigger System on High Rise Structure by Varying Outrigger Depth in Seismic Zones of India by Using Staad Pro

2021 ◽  
pp. 420-423
Author(s):  
Mayuri N. Ade ◽  
Prof. G. D. Dhawle ◽  
Prof. M. M. Lohe
Keyword(s):  
Tall Buildings ◽  
Shear Walls ◽  
Tall Building ◽  
Lateral Stiffness ◽  
Lateral Loads ◽  
High Rise ◽  
The Core ◽  
Lateral Forces ◽  
Almost Everywhere ◽  
The World

Tall building development is rapidly growing almost everywhere in the world acquainting new difficulties that need to be met with, through engineering evaluation. In tall buildings, lateral loads generated by earthquake or wind load are frequently resisted by providing coupled shear walls. But as the height increases, the building becomes taller and the efficiency of the tall building greatly depends on lateral stiffness and resistance capacity. So, a system called outrigger is introduced which improves overturning stiffness and strength by connecting shear wall core to outer columns. When the Structure is subjected to Lateral forces, the Outrigger and the columns resist the rotation of the core and thus significantly reduce the lateral deflection and base moment, which would have arisen in a free core. During the last three decades, numerous studies have been carried out on the analysis and behaviour of outrigger structures. But this question is remained that how many outriggers system is needed in tall buildings. (Using Staad-Pro)

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.

Study of the dynamic response of a CAARC building by the synthetic wind method and comparison with different approaches

2022 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Lucas Willian Aguiar Mattias ◽  
Carlos Andres Millan Paramo
Keyword(s):  
Wind Tunnel ◽  
Dynamic Response ◽  
Good Accuracy ◽  
Wind Tunnel Test ◽  
Power Spectra ◽  
Tall Buildings ◽  
Experimental Results ◽  
Content Type ◽  
Different Types ◽  
Numerical Approaches

Purpose This paper analyzes the effect that is generated in the dynamic response of a Commonwealth Advisory Aeronautical Council building for different types of power spectra. This article also compares synthetic wind method (SWM) results with wind tunnel tests and other numerical approaches.Design/methodology/approach One of the main methodologies developed in Brazil, the SWM, is employed to determine the dynamic wind loads. The Davenport, Lumley and Panowski, Harris, von Karman and Kaimal model are used in SWM to generate the resonant harmonics. Lateral pressures are calculated by the wind speed deflection profile for 30, 35, 40 and 45 m/s. The structure is processed in Autodesk Robot Structural Analysis with numerical analysis in FEM by the Hilber–Hughes–Taylor method. To corroborate the synthetic wind with experimental results, displacement curves are developed for wind tunnel experimental results, Davenport method, Eurocode and NBR 6123, together with the SWM.Findings Results show that for 30 m/s, the lowest convergence of the power spectra models was presented and that the greatest difference found was below 10%. In addition, it was shown that Eurocode 1-4 can lead to oversizing, while NBR 6123 can lead to undersizing, compared with the experimental results. Finally, results by the Davenport method, wind tunnel test and synthetic wind showed good accuracy.Originality/value By carrying out this comparative analysis, this work presents an important contribution in the field of calculating the dynamic response of tall buildings. Studies with these comparisons to corroborate the SWM had not yet been carried out.

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