Wind Induced Vibration of a Super Tall Building Considering the Variations of its Damping

2012 ◽  
Vol 433-440 ◽  
pp. 1470-1473
Author(s):  
An Xu
Keyword(s):  
Great Degree ◽  
Wind Direction ◽  
Structural Response ◽  
Nonlinear Damping ◽  
Wind Load ◽  
Tall Building ◽  
Wind Loads ◽  
Result Show ◽  
Study Case ◽  
Wind Induced Vibration

In this paper, a improved algorithm based on Newmark-βto analyze the structural response under wind loads was presented and enhance the calculation efficiency in a great degree. The GWT was presented as an study case and its response under wind load was calculated by the proposed method. Nonlinear damping was taken into consideration in calculation. The result show that the structural RMS response in cross-wind direction is much larger than that in along-wind direction.

Analysis on Wind-Induced Vibration of Tall Buildings in Hilly Terrain

2014 ◽  
Vol 580-583 ◽  
pp. 2567-2571
Author(s):  
Yi Sun ◽  
Nuan Deng ◽  
Zheng Liang Li
Keyword(s):  
Wind Tunnel ◽  
Wind Field ◽  
Wind Tunnel Test ◽  
Tall Buildings ◽  
Wind Load ◽  
Wind Loads ◽  
Test Results ◽  
Hilly Terrain ◽  
Flat Terrain ◽  
Wind Induced Vibration

The responses of tall buildings under wind loads in hilly terrain are remarkably different from that in flat terrain. Wind load codes can’t work efficiently or directly to calculate the wind-induced vibration of tall buildings in hilly terrain. Utilizing some wind tunnel test results of wind field in hilly terrain and pressures on tall buildings, the access to response of tall buildings on hilly terrain were provided. Some effects from hill characteristics to building responses were discussed.

Wind Loads Simulation of Tall Building Structure Subjected to Wind-Structure Interaction

2010 ◽  
Vol 163-167 ◽  
pp. 4286-4289
Author(s):  
Wen Bo Bao ◽  
Yu Yong Hu ◽  
Yang Cui
Keyword(s):  
Coupling Effect ◽  
Harmonic Wave ◽  
Wind Load ◽  
Tall Building ◽  
Wind Loads ◽  
Superposition Method ◽  
Building Structure ◽  
Complex Load ◽  
Structure Interaction ◽  
Wind Structure

Wind is an important and complex load and an important basis in the structural analysis and the design of high-rise structure. Based on Davenport wind spectrum, multi-dimensional fluctuating wind and random wind load of tall building structure are simulated by using harmonic wave superposition method. To investigate the coupling effect of wind loads, wind-structure system is solved with Wilson-θ step-by-step numerical integration method, and the wind load of Tall building structure subjected to fluid-structure interaction. Turbulence intensity and its variation are presented in this paper.

LQG Control of Across-Wind Response of a Tall Building with AMD

2014 ◽  
Vol 1004-1005 ◽  
pp. 1602-1607
Author(s):  
Young Moon Kim ◽  
Ki Pyo You ◽  
Jang Youl You
Keyword(s):  
Gaussian White Noise ◽  
Tall Buildings ◽  
Wind Load ◽  
Tall Building ◽  
Structural Safety ◽  
Linear Quadratic ◽  
Gaussian White Noise Process ◽  
Wind Vibration ◽  
Vibration Responses ◽  
Wind Induced Vibration

Modern tall buildings are more flexible so occur excessive wind-induced vibration resulting in occupant discomfort and structural safety. Many studies to reduce such a wind-induced vibration using a feedback controller and auxiliary devices have been conducted .The optimal control law of linear quadratic Gaussian (LQG) controller is used for reducing the across-wind vibration response of a tall building with an active mass damper (AMD). Fluctuating across-wind load treated as a Gaussian white noise process is simulated numerically in time domain. And using this simulated across-wind load estimated across-wind vibration responses of tall building with AMD using LQG controller.

Interference Effect Tall Building to Fluctuations Wind Load

2013 ◽  
Vol 871 ◽  
pp. 9-14
Author(s):  
Ki Pyo You ◽  
Young Moon Kim ◽  
Jang Youl You
Keyword(s):  
Wind Direction ◽  
Interference Effect ◽  
Separation Distance ◽  
Tall Building ◽  
Wind Loads ◽  
Interference Effects ◽  
Existing Building ◽  
Close Vicinity ◽  
Side Ratio ◽  
Adjacent Building

The construction of another tall building in the close vicinity of existing building may lead to a modification in its response. Therefore, the wind loads on buildings in realistic environments may be considerably different from these measured on isolated buildings. Neighboring buildings may either decrease or increase the flow-induced forces on a structure, depending mainly on the geometry and arrangement of these buildings, their orientation with respect to the direction of flow and upstream terrain conditions. In this study deals with mean and fluctuating as well as their spectra on a building due to an adjacent building of side ratio 1 for wind direction from 0 to 45 degree and separation distance between two models. Interference effects were presented in the form of interference factors. And experiments were compared to these measured on isolated building.

LQG Control of Along-Wind Responses of Tall Building Using Composite Tuned Mass Dampers

2016 ◽  
Vol 723 ◽  
pp. 753-759
Author(s):  
Young Moon Kim ◽  
Ki Pyo You ◽  
Jang Youl You ◽  
Sun Young Paek ◽  
Byung Hee Nam
Keyword(s):  
Tuned Mass Damper ◽  
Wind Load ◽  
Tall Building ◽  
Control Force ◽  
Load Spectrum ◽  
Linear Quadratic ◽  
Tuned Mass Dampers ◽  
Optimum Parameters ◽  
Mass Damper ◽  
Wind Induced Vibration

A composite tuned mass damper(CTMD) is a vibration control device consisting of an active-passive tuned mass dampers supported on the primary vibrating structure. The performance of CTMD in mitigating wind-induced vibration of tall building is investigated. Optimum parameters of a passive tuned mass damper(PTMD)for minimizing the variance response of the damped primary structure under random loads, with different mass ratio of an active tuned mass damper(ATMD) to a PTMD have been used for the optimum parameters of CTMD. The active control force generated by ATMD actuator was estimated by using linear quadratic Gaussian(LQG) controller, and the fluctuating along-wind load, treated as a stationary random process ,was simulated numerically using the along-wind load spectrum proposed by Solari .Comparing the along-wind rms response of tall building without a CTMD, the CTMD is effective in reducing the response to 40%~45% of the response without the CTMD. Therefore, the CTMD system was effective in reducing wind-induced vibration of tall building.

Wind Pressure and Wind-Induced Vibration of Heliostat

2008 ◽  
Vol 400-402 ◽  
pp. 935-940 ◽  
Author(s):  
Ying Ge Wang ◽  
Zheng Nong Li ◽  
Bo Gong ◽  
Qiu Sheng Li
Keyword(s):  
Dynamic Response ◽  
Wind Direction ◽  
Wind Load ◽  
Wind Pressure ◽  
Induced Response ◽  
Vertical Angle ◽  
Lateral Direction ◽  
Direction Angle ◽  
Wind Pressures ◽  
Fluctuating Wind

Heliostat is the key part of Solar Tower power station, which requires extremely high accuracy in use. But it’s sensitive to gust because of its light structure, so effect of wind load should be taken into account in design. Since structure of heliostat is unusual and different from common ones, experimental investigation on rigid heliostat model using technology of surface pressure mensuration to test 3-dimensional wind loads in wind tunnel was conducted. The paper illustrates distribution and characteristics of reflector’s mean and fluctuating wind pressure while wind direction angle varied from 0° to 180° and vertical angle varied from 0° to 90°. Moreover, a finite element model was constructed to perform calculation on wind-induced dynamic response. The results show that the wind load power spectral change rulers are influenced by longitudinal wind turbulence and vortex and are related with Strouhal number; the fluctuating wind pressures between face and back mainly appear positive correlation, and the correlation coefficients at longitudinal wind direction are smaller than those at lateral direction; the fluctuating wind pressures preferably agree with Gaussian distribution at smaller vertical angle and wind direction angle. The wind-induced response and its spectrums reveal that: when vertical angle is small, the background responsive values of reflector’s different parts are approximately similar; in addition, multi-phased resonant response occurring at the bottom. With the increase of , airflow separates at the near side and reunites at the other, as produces vortex which enhances dynamic response at the upper part.

Refined Mathematical Models for Across-Wind Loads of Rectangular Tall Buildings with Aerodynamic Modifications

2021 ◽  
pp. 2150131
Author(s):  
Yi Li ◽  
Chao Li ◽  
Qiu-Sheng Li ◽  
Yong-Gui Li ◽  
Fu-Bin Chen
Keyword(s):  
Wind Tunnel ◽  
Correlation Coefficients ◽  
Tall Buildings ◽  
Tall Building ◽  
Experimental Results ◽  
Dynamic Loads ◽  
Wind Loads ◽  
Empirical Formulas ◽  
Benchmark Model ◽  
Power Spectral

This paper aims to systematically study the across-wind loads of rectangular-shaped tall buildings with aerodynamic modifications and propose refined mathematic models accordingly. This study takes the CAARC (Commonwealth Advisory Aeronautical Research Council) standard tall building as a benchmark model and conducts a series of pressure measurements on the benchmark model and four CAARC models with different round corner rates (5%, 10%, 15% and 20%) in a boundary layer wind tunnel to investigate the across-wind dynamic loads of the typical tall building with different corner modifications. Based on the experimental results of the five models, base moment coefficients, power spectral densities and vertical correlation coefficients of the across-wind loads are compared and discussed. The analyzed results shown that the across-wind aerodynamic performance of the tall buildings can be effectively improved as the rounded corner rate increases. Taking the corner round rate and terrain category as two basic variables, empirical formulas for estimating the across-wind dynamic loads of CAARC standard tall buildings with various rounded corners are proposed on the basis of the wind tunnel testing results. The accuracy and applicability of the proposed formulas are verified by comparisons between the empirical formulas and the experimental results.

Wind loads and structural response: Benchmarking LES on a low-rise building

2017 ◽  
Vol 144 ◽  
pp. 26-42 ◽  
Author(s):  
M. Ricci ◽  
L. Patruno ◽  
S. de Miranda
Keyword(s):  
Structural Response ◽  
Wind Loads
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