Author: Neil John JamiesonPublisher:
ISBN:
Category : Buildings
Languages : en
Pages :
Book Description
Simulation of Wind Induced Building Motion
Author: Neil John JamiesonPublisher:
ISBN:
Category : Buildings
Languages : en
Pages :
Book Description
Wind-induced Motion of Tall Buildings
Author: Kenny C. S. KwokPublisher:
ISBN: 9780784413852
Category : Architecture
Languages : en
Pages : 66
Book Description
This state-of-the-art report describes various facets of the human response to wind-induced motion in tall buildings and identifies design strategies to mitigate the effects of such motion on building occupants.
Simulation Studies of a Vibration Damper for Wind-induced Motion of a Tall Building
Author: J. R. AmyotVibration Analysis and Control in Mechanical Structures and Wind Energy Conversion Systems
Author: Francisco Beltran-CarbajalPublisher: BoD – Books on Demand
ISBN: 178923056X
Category : Technology & Engineering
Languages : en
Pages : 132
Book Description
This book focuses on recent and innovative methods on vibration analysis, system identification, and diverse control design methods for both wind energy conversion systems and vibrating systems. Advances on both theoretical and experimental studies about analysis and control of oscillating systems in several engineering disciplines are discussed. Various control devices are synthesized and implemented for vibration attenuation tasks. The book is addressed to researchers and practitioners on the subject, as well as undergraduate and postgraduate students and other experts and newcomers seeking more information about the state of the art, new challenges, innovative solutions, and new trends and developments in these areas. The six chapters of the book cover a wide range of interesting issues related to modeling, vibration control, parameter identification, active vehicle suspensions, tuned vibration absorbers, electronically controlled wind energy conversion systems, and other relevant case studies.
Wind-induced Dynamic Response of Tall Buildings with Coupled 3D Modes of Vibration
Author: David Yun Nin YipPublisher:
ISBN:
Category : Buildings
Languages : en
Pages : 256
Book Description
Intelligent Control Systems for Wind-induced Vibration Mitigation in Tall Buildings
Author: Khalid Mohammad Abdelaziz Mohammad AbdelazizPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Wind-induced vibration (WIV) is a major contributor to the high investment cost of tall buildings. WIV can render a building unserviceable and strongly affect occupant comfort. It can also damage internal building components and may even cause catastrophic failure in severe cases. According to most design codes, tall buildings must be designed to endure severe wind events with return periods as long as 50 years, which requires additional construction material and design effort. Tuned mass/liquid dampers (TMDs/TLDs) have been designed and employed to reduce WIV effects. They rely on using energy dissipation mechanisms, such as oil flow through constrictions, to absorb WIV energy from the host structure. TMDs and TLDs are narrowband devices which are not adaptable to different wind characteristics. They also tend to consume space in higher floors where real estate is usually more expensive. To inhibit even the initial formation of WIV, aerodynamic modifications (AMs) have been used both independently and in conjunction with TMDs and TLDs. By changing the external shape of the building, the wind system attacking the building can be altered so the building becomes less susceptible to WIV. Major AMs change the overall shape of the building by introducing tapers, setbacks and helix features. Alternatively, minor AMs introduce corner or edge changes such as rounding, fillets or cut-offs. The literature review presented herein concludes that AMs have the potential to reduce WIV accelerations by 30-60%. However, AMs that are effective at reducing WIV accelerations at certain wind conditions may inadvertently increase those accelerations depending on the wind characteristics and the surrounding environment. This work focuses on designing and optimally controlling active aerodynamic modification systems that can change their orientation to guarantee consistent WIV reduction across different wind conditions and environmental changes. A central aim to the designs and techniques presented in this work is to generate versatile controllers that can work across different building and AM designs, wind characteristics and surrounding environments while minimizing user input and deployment effort. To achieve these goals various machine learning models and techniques are used because they generally support a black box design approach. An AM design using four plates installed on the corners of the building is given special attention in this work. The plates can rotate and hold position around their own axes of symmetry. This design is emphasized for its simplicity, ease of implementation and the minimal number of control parameters. However, the techniques developed herein can also be used for different AM designs. To simulate the WIV response at different wind conditions and plate orientations, this work uses (1) a fluid-solid-interaction simulation model developed specifically to enable plate rotation and building motion in the simulation domain, (2) wind tunnel experiments of a 1:400 scaled robotic aeroelastic building model and (3) large-scale wind tunnel experiments of a 1:73 scaled robotic aeroelastic building model. These models are controlled using (1) a wind condition averaging control approach using a developed iterative optimum training technique proven herein to use a substantially reduced number of experiments to obtain optimal training and (2) The combination of a distributed sensor network and recurrent neural networks to fully define the instantaneous system state using time series inputs. The final version of the control scheme developed in this work uses a genetic reinforcement learning method that enhances the exploration capacity of reinforcement learning and makes it more likely to find global optimum solutions. The results indicate that utilizing the developed designs and control techniques can reduce WIV response by 40-90% depending on the wind condition. The developed controller was able to minimize WIV in randomly varying wind conditions even for conditions it did not specifically encounter during training.
Wind Tunnel Testing of High-Rise Buildings
Author: Peter IrwinPublisher: Routledge
ISBN: 1317999959
Category : Technology & Engineering
Languages : en
Pages : 144
Book Description
Since the 1960s, wind tunnel testing has become a commonly used tool in the design of tall buildings. It was pioneered, in large part, during the design of the World Trade Center Towers in New York. Since those early days of wind engineering, wind tunnel testing techniques have developed in sophistication, but these techniques are not widely understood by the designers using the results. As a direct result, the CTBUH Wind Engineering Working Group was formed to develop a concise guide for the non-specialist. The primary goal of this guide is to provide an overview of the wind tunnel testing process for design professionals. This knowledge allows readers to ask the correct questions of their wind engineering consultants throughout the design process. This is not an in-depth guide to the technical intricacies of wind tunnel testing, it focusses instead on the information the design community needs, including: a unique methodology for the presentation of wind tunnel results to allow straightforward comparison of results from different wind tunnel laboratories. advice on when a tall building is likely to be sufficiently sensitive to wind effects to benefit from a wind tunnel test background for assessing whether design codes and standards are applicable details of the types of tests that are commonly conducted descriptions of the fundamentals of wind climate and the interaction of wind and tall buildings This unique book is an essential guide for all designers of tall buildings, and anyone else interested in the process of wind tunnel testing for tall buildings.
Building Motion in Wind
Author: N. IsyumovPublisher:
ISBN:
Category : Buildings
Languages : en
Pages : 124
Book Description
Proceedings of a session at the ASCE Convention, held in Seattle, Washington, April 8, 1986. Sponsored by the Aerodynamics Committee of the Aerospace Division and the Wind Effects Committee of the Structural Division of ASCE. This collection contains six papers examining the motions of buildings produced by wind. The trend towards higher structural efficiency and lower cost has resulted in a generation of lighter and more flexible buildings with a lower inherent capacity for energy dissipation or damping. Unfortunately, this trend has produced structures that are more sensitive to the dynamic action of wind. The emphasis in the design of modern tall buildings has therefore shifted to requirements that control building movements or drift and that limit wind-induced accelerations. Two papers deal with the action of wind on two important tall buildings where designers relied on wind tunnel model tests for information on wind-induced loads and building motions. The design of the Columbia Seafirst Center took advantage of economies possible as a result of wind tunnel studies., and viscoelastic dampers were added to limit the building's motion and wind-induced acceleration. The recorded response of the Allied Bank Plaza during Hurricane Alicia is an extremely important contribution to the understanding of the action of wind on tall buildings; this is the only existing record of the response of a major building under the action of design winds. Another paper discusses a survey of structural damping found in tall buildings, presenting typical damping values for steel and concrete buildings and discussing the variability of such estimates and its implication on design. The final papers consider damping systems that can be added to tall buildings in order to limit their motion. The use of tuned mass dampers and viscoelastic damping units is discussed and examples are presented to show their practical effectiveness. The viscoelastic dampers used in the Columbia Seafirst Center are described.
A Preliminary Analysis of Wind Induced Coupled Motion in Tall Buildings
Author: Supat PoopakaPublisher:
ISBN:
Category : Buildings
Languages : en
Pages : 58
Book Description
Advanced Structural Wind Engineering
Author: Yukio TamuraPublisher: Springer Science & Business Media
ISBN: 4431543376
Category : Science
Languages : en
Pages : 414
Book Description
This book serves as a textbook for advanced courses as it introduces state-of-the-art information and the latest research results on diverse problems in the structural wind engineering field. The topics include wind climates, design wind speed estimation, bluff body aerodynamics and applications, wind-induced building responses, wind, gust factor approach, wind loads on components and cladding, debris impacts, wind loading codes and standards, computational tools and computational fluid dynamics techniques, habitability to building vibrations, damping in buildings, and suppression of wind-induced vibrations. Graduate students and expert engineers will find the book especially interesting and relevant to their research and work.