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.

Optimal design of wind-induced vibration control of tall buildings and high-rise structures

1999 ◽  
Vol 2 (1) ◽  
pp. 69-83 ◽  
Author(s):  
Qiusheng Li ◽  
Hong Cao ◽  
Guiqing Li ◽  
Shujing Li ◽  
Dikai Liu
Keyword(s):  
Optimal Design ◽  
Vibration Control ◽  
Tall Buildings ◽  
High Rise ◽  
Wind Induced Vibration

Wind-Induced Vibration Control and Analysis of Super High-Rise Structure Using Viscous Damping Walls

2014 ◽  
Vol 488-489 ◽  
pp. 647-651
Author(s):  
Yan Guo ◽  
Wen Guang Liu ◽  
Jian Zhang ◽  
Wen Fu He
Keyword(s):  
Vibration Control ◽  
Design Method ◽  
Technical Specification ◽  
Structural Safety ◽  
Viscous Damping ◽  
Structural Dynamic ◽  
High Rise ◽  
Limit Value ◽  
Control Scheme ◽  
Wind Induced Vibration

The wind-induced vibration control and analysis of a super high-rise structure located in the area of strong typhoon with viscous damping walls is introduced. Mechanical properties and design method of viscous damping wall are described, and then the arrangement scheme is put forward. The performances of structure with and without viscous damping walls under the condition of basic wind strength encountered once for 10 years are investigated in detail. The results show that the control scheme can dissipate energy of wind-induced vibration, attenuate structural dynamic response and reduce the mutation of acceleration along height direction effectively. The maximum peak acceleration can be reduced by 23.5% to 0.241m/s2, which meets 0.25m/s2 limit value stated by Technical specification for concrete structures of tall building. Therefore, the arrangement scheme is feasible and effective to control wind-induced vibration and improve structural safety and comfort.

scholarly journals Wind-Induced Vibration Control of High-Rise Structures Using Compound Damping Cables

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Jianda Yu ◽  
Zhibo Duan ◽  
Xiangqi Zhang ◽  
Jian Peng
Keyword(s):  
Vibration Control ◽  
Damping Ratio ◽  
Viscosity Coefficient ◽  
Structural Vibration ◽  
Vibration Displacement ◽  
High Rise ◽  
Main Cable ◽  
Small Vortex ◽  
Wind Induced Vibration ◽  
Fluctuating Wind

Based on the vibration reduction mechanism of compound damping cables, this study focuses on the wind-induced vibration control of high-rise structures with additional mass at the top. The differential equation of motion of the system under the action of the composite damping cable is established, and the analytical solution of the additional damping ratio of the structure is deduced, which is verified by model tests. The vibration response of the structure under the action of simple harmonic vortex excitation and randomly fluctuating wind loads is studied, and the effect of different viscous coefficients of the dampers in the composite damping cable and different installation heights of the damping cable on the vibration control is analyzed. The results show that a small vortex excitation force will cause large vibrations of low-dampened towering structures, and the structure will undergo buffeting under the action of wind load pulse force. The damping cable can greatly reduce the amplitude of structural vibration. The root means square of structural vibration displacement varies with damping. The viscosity coefficient of the device and the installation height of the main cable of the damping cable are greatly reduced.

Increasing Damping Ratios in a Tuned Liquid Damper Using Damping Bars

2007 ◽  
Vol 353-358 ◽  
pp. 2652-2655 ◽  
Author(s):  
Ki Pyo You ◽  
Young Moon Kim ◽  
Cheol Min Yang ◽  
Dong Pyo Hong
Keyword(s):  
Passive Control ◽  
Damping Ratio ◽  
Tall Buildings ◽  
Shaking Table ◽  
Water Tank ◽  
Tuned Liquid Damper ◽  
Structural Vibrations ◽  
Existing Structures ◽  
Long Time ◽  
Wind Induced Vibration

Wind-induced vibration of tall buildings have been of interest in engineering for a long time. Wind-induced vibration of a tall building can be most effectively controlled by using passive control devices. The tuned liquid damper(TLD) is kind of a passive mechanical damper, which relies on the sloshing liquid in a rigid tank. TLD has been successfully employed in practical mitigation of undesirable structural vibrations because it has several potential advantages: low costs, easy installation in existing structures, and effectiveness even against small-amplitude vibrations. Shaking table experiments were conducted to investigate the characteristics of the shallow water sloshing motion in a rectangular tank. To increase the damping ratio of the rectangular water tank, triangle sticks were installed at the bottom of water tank. This installation increased the damping ratio by amaximum of 40-70%.

scholarly journals Identification of Sudden Stiffness Change in the Acceleration Response of a Nonlinear Hysteretic Structure

2020 ◽  
Vol 2020 ◽  
pp. 1-20
Author(s):  
Sheng-Lan Ma ◽  
Shao-Fei Jiang ◽  
Chen Wu ◽  
Si-Yao Wu
Keyword(s):  
Structural Model ◽  
Dynamic Responses ◽  
Physical Parameters ◽  
Discrete Wavelet ◽  
Time Varying ◽  
Ground Acceleration ◽  
Structural Dynamic ◽  
Filter Tuning ◽  
Structural Responses ◽  
Extent Of Damage

The integration of discrete wavelet transform and independent component analysis (DWT-ICA) method can directly identify time-varying changes in linear structures. However, better metrics of structural seismic damage and future performance after an event are related to structural permanent and total plastic deformations. This study proposes a two-stage technique based on DWT-FastICA and improved multiparticle swarm coevolution optimization (IMPSCO) using a baseline nonlinear Bouc–Wen structural model to directly identify changes in stiffness caused by damage as well as plastic or permanent deflections. In the first stage, the measured structural dynamic responses are preprocessed firstly by DWT, and then the Fast ICA is used to extract the feature components that contain the damage information for the purpose of initially locating damage. In the second stage, the structural responses are divided at the identified damage instant into segments that are used to identify the time-varying physical parameters by using the IMPSCO, and the location and extent of damage can accordingly be identified accurately. The efficiency of the proposed method in identifying stiffness changes is assessed under different ground motions using a suite of two different ground acceleration records. Meanwhile, the effect of noise level and damage extent on the proposed method is also analyzed. The results show that in a realistic scenario with fixed filter tuning parameters, the proposed approach identifies stiffness changes within 1.25% of true stiffness within 8.96 s; therefore, it can work in real time. Parameters are identified within 14% of the actual as-modeled value using noisy simulation-derived structural responses. This indicates that, in accordance with different demands, the proposed method can not only locate and quantify damage within a short time with a high precision but also has excellent noise tolerance, robustness, and practicality.

scholarly journals Evacuation egress in high rise building: Review of the current design evacuation solution

2019 ◽  
Vol 258 ◽  
pp. 03012 ◽  
Author(s):  
Hazrina Mansor ◽  
Yazmin Sahol Hamid ◽  
Nurul Huda Suliman ◽  
Nursafarina Ahmad ◽  
Noorfaizah Hamzah
Keyword(s):  
United Arab Emirates ◽  
Real Life ◽  
Tall Buildings ◽  
Building Design ◽  
Tall Building ◽  
Building Evacuation ◽  
High Rise ◽  
Current Design ◽  
Safety Systems ◽  
Engineering Practices

In the aftermath of the September 11th attack, design of tall buildings particularly in the aspect of safety systems and structural robustness, arguably the most crucial issues that is deliberated till to date. Concerning the safety systems specifically on evacuation egress, many novels and innovative evacuation solutions for high rise buildings that have been researched and put forward, for instances Platform Rescue Systems (PRS), Controlled Descent Devices (CDD) and Escape Chutes. Still, the practicability of the existing proposed egress systems to be implemented in the real-life situation and its compliance with the tall building design legislation remain unknown. For developing countries such as Malaysia and United Arab Emirates, tall buildings play a role as an iconic landmark. While countries like China and Hong Kong, tall building is needed due to the scarcity of land and high populations. As more than one hundred tall structure exists in the world, and will be increasing by 2020; therefore, it is urgently needed that existing engineering practices in designing tall building to be reviewed with respect to evacuation egress. The main objective of this paper is to create awareness among developers, consultants and contractors that proper evacuation egress in tall building design and development is a must. This paper provides a comprehensive review of the existing engineering practices on tall building evacuation planning systems and design. Furthermore, the effectiveness of the currently proposed systems and its consideration amongst structural and safety engineers are also reported.

PD/PID Controller Design for Seismic Control of High-Rise Buildings Using Multi-Objective Optimization: A Comparative Study with LQR Controller

2017 ◽  
Vol 11 (03) ◽  
pp. 1750009 ◽  
Author(s):  
Sadegh Etedali ◽  
Saeed Tavakoli
Keyword(s):  
Optimization Design ◽  
Tall Buildings ◽  
Pid Controllers ◽  
Multi Objective Optimization ◽  
Nsga Ii ◽  
Multi Objective ◽  
Seismic Control ◽  
High Rise ◽  
Lqr Controller ◽  
Structural Responses

This paper developed multi-objective optimization design of proportional–derivative (PD) and proportional–integral–derivative (PID) controllers for seismic control of high-rise buildings. The case study is an 11-story realistic building equipped with active tuned mass damper (ATMD). Four earthquakes and nine performance indices are taken into account to assess the performance of the controllers. To create a good trade-off between the performance and robustness of the closed-loop structural system, a non-dominated sorting genetic algorithm, NSGA-II, is employed. To evaluate the degree of robustness of the controllers, four structural models with uncertainties in the nominal model of the structure is considered. For comparison purposes, a linear quadratic regulator (LQR) controller is also designed in the numerical simulations. Simulation results show that the proposed PD and PID controllers significantly perform better than the LQR in reduction of structural responses. Also, it is shown that the LQR does not provide a good performance in strong earthquakes. However, PD and PID controllers are able to significantly reduce structural responses. Moreover, it is shown that the PID has a better performance than the PD. The results also show that the proposed controllers are capable of maintaining a desired performance in the presence of modeling errors. They also have several advantages over modern controllers in terms of simplicity and reduction of required sensors and computational resources in tall buildings.

Fazlur Khan (1929–1982): reflections on his life and works

2002 ◽  
Vol 29 (2) ◽  
pp. 238-245 ◽  
Author(s):  
Aftab A Mufti ◽  
Baidar Bakht
Keyword(s):  
Tall Buildings ◽  
Tall Building ◽  
Structural Systems ◽  
Biographical Sketch ◽  
Structural System ◽  
National Pride ◽  
High Rise ◽  
Vertical Scale ◽  
The 1960S ◽  
Structural Engineers

Tall buildings, or skyscrapers, are icons of cities, symbols of corporate power, and a mark of national pride. Certain skyscrapers, such as the John Hancock Center and the Sears Tower in Chicago, are also marvels of engineering that have paved the way for ever increasing heights of structural systems. Since the 1960s, a series of new structural systems has been introduced with the objective of achieving economically-competitive and aesthetically-pleasing tall buildings without compromising safety. One of the great structural engineers responsible for the new structural systems was Dr. Fazlur Rahman Khan. This paper provides a biographical sketch of Dr. Khan and discusses some of his innovations pertaining to high-rise buildings. It shows that his contributions led to a new vertical scale for the modern day city.Key words: aesthetics, architecture, innovation, structural system, tall building.

scholarly journals Mixed-use development in a high-rise context

2018 ◽  
Vol 33 ◽  
pp. 01021 ◽  
Author(s):  
Elena M. Generalova ◽  
Viktor P. Generalov ◽  
Anna A. Kuznetsova ◽  
Oksana N. Bobkova
Keyword(s):  
Urban Space ◽  
Tall Buildings ◽  
Tall Building ◽  
Living Environment ◽  
Urban Structure ◽  
Compact City ◽  
Actual Problem ◽  
High Rise ◽  
Mixed Use ◽  
Qualitative Characteristics

The article deals with an actual problem of finding techniques and methods to create a comfortable urban environment. The authors emphasize that in the existing conditions of intensive urban development greater attention should be given to spatial concentration based on and more compact distribution of population in urban space. It is stressed that including mixed-use facilities into urban realm results in a significant improvement of living environment qualitative characteristics. The paper also examines modern approaches to constructing a «compact city» for comfortable and convenient living with a mixed-use tall building development. The authors explore the world's experience of designing tall mixed-use buildings and reveal modern trends in their construction. The statistics given is based on the data analysis of a group of tall mixed-use buildings consisting of more than 400 objects, constructed in 2007-2016. The research shows functional and architectural peculiarities of this typology of tall buildings and investigates a mechanism of creating zones of mixed-use tall building development in the urban structure. In conclusion, the authors consider prospects of development and major directions of improvement of mixed-use tall building parameters for a reasonable territorial urban growth and creation of high-density and comfortable building development.

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