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.

Active Control of Along-Wind Response of a Tall Building with AMD Using LQR Controller

2014 ◽  
Vol 490-491 ◽  
pp. 1063-1067 ◽  
Author(s):  
Young Moon Kim ◽  
Ki Pyo You ◽  
Jang Youl You
Keyword(s):  
White Noise ◽  
Gaussian White Noise ◽  
Wind Load ◽  
Tall Building ◽  
White Noise Process ◽  
Noise Process ◽  
Gaussian White Noise Process ◽  
Wind Response ◽  
Wind Vibration ◽  
Lqr Controller

Most of modern tall buildings using lighter construction materials are more flexible so could be excessive wind-induced vibrations resulting in occupant discomfort and structural unsafety. The optimal control technique for reducing along-wind vibration of a tall building based on the linear quadratic regulator (LQR) is presented in this work. Actively controlled reduced along-wind vibration response is obtained from the tall building installed in an active mass damper (AMD) with a LQR controller. Fluctuating along-wind load is generated using numerical simulation method, which can formulate a stationary Gaussian white noise process. Simulating wind load in the time domain using known spectra data of fluctuating along-wind load is particularly useful for estimation of windinduced vibration which is more or less narrow banded process such as a along-wind response of a tall building. In this work, fluctuating along-wind load acting on a tall building treated as a stationary Gaussian white noise process is simulated numerically using the along-wind load spectra proposed by G. Solari in1992. And using this simulated along-wind load estimated the reduced along-wind vibration response of a tall building installed in an AMD with a LQR controller.

Bracing Systems for Seismic and Wind Performance of Tall Buildings

2013 ◽  
Vol 650 ◽  
pp. 667-672 ◽  
Author(s):  
Dong Keon Kim ◽  
Jong Wan Hu
Keyword(s):  
Base Isolation ◽  
Tall Buildings ◽  
Wind Load ◽  
Tall Building ◽  
Structural Safety ◽  
Seismic Load ◽  
Isolation System ◽  
Seismic Codes ◽  
The World ◽  
Base Isolation System

Occurrence of frequency of earthquakes around the world has been increased including Sendai earthquake in Japan and magnitude of earthquake has also increased. Recently, many tall buildings using local seismic codes can be exposed to the risk of an earthquake and wind. Also, some buildings, which was planned to be built, were foundered as a result of lack of finance. Therefore, for tall buildings, structural safety such as earthquake and wind resistant performance, and financing issue are very important to progress the huge project. So we need to find another optimum alternative other than damping devices and base isolation system. In this study, four types of test specimens are used, which are fifty-story base tall building, tall building that was reinforced with diagonal brace, x-brace, and Chevron brace. And all of these cases, are subjected to the seismic load and wind load, finally analyzed and compared for seismic and wind performances.

scholarly journals LQG Control of Along-Wind Response of a Tall Building with an ATMD

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Ki-Pyo You ◽  
Jang-Youl You ◽  
Young-Moon Kim
Keyword(s):  
Damping Ratio ◽  
Tall Buildings ◽  
Tuned Mass Damper ◽  
Wind Load ◽  
Tall Building ◽  
Structural Safety ◽  
Design Parameters ◽  
Random Load ◽  
Mass Damper ◽  
Wind Response

Modern tall buildings use lighter construction materials that have high strength and less stiffness and are more flexible. Although this results in the improvement of structural safety, excessive wind-induced excitations could lead to occupant discomfort. The optimal control law of a linear quadratic Gaussian (LQG) controller with an active tuned mass damper (ATMD) is used for reducing the along-wind response of a tall building. ATMD consists of a second mass with optimum parameters for tuning frequency and damping ratio of the tuned mass damper (TMD), under the stationary random load, was used. A fluctuating along-wind load, acting on a tall building, was treated as a stationary Gaussian white noise and was simulated numerically, in the time domain, using the along-wind load spectra proposed by G. Solari in 1993. Using this simulated wind load, it was possible to calculate the along-wind responses of a tall building (with and without the ATMD), using an LQG controller. Comparing the RMS (root mean square) response revealed that the numerically simulated along-wind responses, without ATMD, are a good approximation to the closed form response, and that the reduced responses with ATMD and LQG controller were estimated by varying the values of control design parameters.

LQR Control of Along-Wind Response of a Tall Building

2013 ◽  
Vol 421 ◽  
pp. 767-771 ◽  
Author(s):  
Young Moon Kim ◽  
Ki Pyo You ◽  
Jang Youl You ◽  
Sun Young Paek ◽  
Byung Hee Nam
Keyword(s):  
Time Domain ◽  
Tall Buildings ◽  
Wind Load ◽  
Tall Building ◽  
Control Force ◽  
Optimum Control ◽  
Linear Quadratic ◽  
Lqr Control ◽  
Wind Response ◽  
The Time Domain

Modern tall buildings using high strength and lighter construction materials are more flexible so could be excessive wind-induced vibrations resulting in occupant discomfort and structural unsafety. Recently, many studies have been advanced in using actuator force as an active control force based on the linear quadratic optimum control theory .It needs to predict the wind-induced response and the optimum control force to reduce the excessive wind-induced vibration. It takes a lot of time and cost to do wind tunnel test needed it, so numerical simulation approach instead of that is recommended sometimes. Simulating wind load in the time domain using known spectra data of fluctuating wind load is particularly useful for some prediction of windinduced vibration which is more or less narrow banded process such as a along-wind response of a tall building. In this study, fluctuating along-wind load acting on a tall building treated as a stationary Gaussian white noise process was simulated numerically in the time domain using the along-wind load spectra proposed by G.Solari in1992. And using this simulated along-wind load estimated the reduced along-wind vibration response of a tall building which has an active tuned mass damper (ATMD) installed based on the linear quadratic regulator (LQR) control method.

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.

LQG Control of Across-Wind Response of a Tall Building

2013 ◽  
Vol 823 ◽  
pp. 396-401
Author(s):  
Young Moon Kim ◽  
Ki Pyo You ◽  
Jang Youl You
Keyword(s):  
Time Domain ◽  
Tall Buildings ◽  
Wind Load ◽  
Tall Building ◽  
Control Force ◽  
Optimum Control ◽  
Linear Quadratic ◽  
Lqg Control ◽  
Wind Response ◽  
The Time Domain

Modern tall buildings using high strength and lighter construction materials are more flexible so could be excessive wind-induced vibrations resulting in occupant discomfort and structural unsafety . Recently, many studies have been advanced in using actuator force as an active control force based on the linear quadratic optimum control theory. It needs to predict the wind-induced response and the optimum control force to reduce the excessive wind-induced vibration. It takes a lot of time and cost to do wind tunnel test needed it, so numerical simulation approach instead of that is recommended sometimes. Simulating wind load in the time domain using known spectra data of fluctuating wind load is particularly useful for some prediction of windinduced vibration which is more or less narrow banded process such as across-wind response of a tall building. The simulation procedure is taken from Deodatis. In this study, fluctuating across-wind load acting on a tall building was simulated numerically in the time domain using the across-wind load spectra proposed by A.Kareem in1982. And using this simulated across-wind load estimated the reduced across-wind vibration response of a tall building using the linear quadratic Gaussian (LQG) control method.

Mitigation of Wind-Induced Vibration of a 600m High Skyscraper

2019 ◽  
Vol 19 (02) ◽  
pp. 1950015 ◽  
Author(s):  
J. W. Zhang ◽  
Q. S. Li
Keyword(s):  
Vibration Control ◽  
Tall Buildings ◽  
Tall Building ◽  
Dynamic Responses ◽  
Structural Vibrations ◽  
Structural Dynamic ◽  
High Rise ◽  
Structural Responses ◽  
Detailed Assessment ◽  
Wind Induced Vibration

The serviceability of super-tall buildings depends primarily on the wind-induced structural responses, especially accelerations. To mitigate the discomforting structural vibrations, pendulum-type tuned mass damper (TMD) systems are commonly employed in high-rise buildings. However, for a super-tall building with a considerably low fundamental natural frequency, the suspension length of a pendulum-suspended TMD (PTMD) becomes too long to be feasible as it would occupy substantial building space. For the sake of saving valuable space in a super-tall building, a multistage PTMD system is recommended for vibration control. This paper presents a detailed assessment study on the performance of a multistage PTMD system designed for a 600 m high skyscraper located in a typhoon-prone region in China. Wind tunnel tests are first conducted to determine the wind loads on the building for estimation of structural dynamic responses for the scenarios with and without installation of the multistage PTMD system. Optimal design of the multistage PTMD system is then carried out through examining the mitigation efficiency of the PTMD system for a variety of mass and damping ratios. To restrict the strokes of mass dampers in the PTMD system, two-section damping strategy is proposed. The assessment results demonstrate that the multistage PTMD system with two-section damping can function efficiently to suppress the excessive vibrations of the skyscraper, while occupying a minimal space in vertical and horizontal directions. This paper aims to provide an effective and economic design strategy for vibration control of super-tall buildings under wind excitations.

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.

scholarly journals WIND ANALYSIS OF TALL BUILDING

2020 ◽  
Vol 9 (7) ◽  
pp. 147-155
Keyword(s):  
Wind Tunnel ◽  
Structural Damage ◽  
Tall Buildings ◽  
Tall Building ◽  
Structural Safety ◽  
Concrete Buildings ◽  
Metropolitan Cities ◽  
Wind Analysis ◽  
Essential Prerequisite ◽  
Construction Practice

Tall building is an emerging construction practice in Indian metropolitan cities due to large urbanization. The design criteria for tall buildings are different than low and mid-rise buildings. In tall buildings usually, the wind is the critical load that needs to be considered for the safety and serviceability of the structure. Any tall building can vibrate and oscillate in both the directions due to along-wind and across-wind. These oscillations may even cause discomfort to the occupants even if it is not in a threatening position for the structural damage. So, an accurate assessment of building motion is an essential prerequisite for serviceability. National building code and other Indian standard codes are not sufficient to adequately address various issues related to tall buildings. Recently, IS 16700: 2017 “Criteria for Structural Safety of Tall Concrete Buildings” is released by BIS for tall concrete buildings. This Work deals with the detailed wind analysis of 180m tall building as per IS 16700: 2017. In which wind tunnel studies will be carried out on a scaled-down model of a proposed tall building. This wind tunnel studies have also been compared with the responses computed analytically and also check and satisfy all the criteria as per this code.

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