Gust Loading Models Applied to Wind-induced Motion in Tall Buildings PDF Download

Author: Daryl Wayne Boggs
Publisher:
ISBN:
Category : Structural dynamics
Languages : en
Pages : 322

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Author: John D. Holmes
Publisher: CRC Press
ISBN: 1000220753
Category : Technology & Engineering
Languages : en
Pages : 639

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Book Description
Wind forces from extreme wind events are the dominant loading for many parts of the world, exacerbated by climate change and the continued construction of tall buildings and structures. This authoritative source, for practising and academic structural engineers and graduate students, ties the principles of wind loads on structures to the relevant aspects of meteorology, bluff-body aerodynamics, probability and statistics, and structural dynamics. This new edition covers: Climate change effects on extreme winds – particularly those from tropical cyclones, hurricanes and typhoons Modelling of potential wind vulnerability and damage Developments in extreme value probability analysis of extreme wind speeds and directions Explanation of the difference between ‘return period’ and ‘average recurrence interval’, as well as ‘bootstrapping’ techniques for deriving confidence limits Wind over water, and profiles and turbulence in non-synoptic winds An expanded chapter on internal pressures produced by wind for various opening and permeability scenarios Aerodynamic shaping of high- and low-rise buildings Recent developments in five major wind codes and standards A new chapter on computational fluid dynamics (CFD), as applied to wind engineering A greatly expanded appendix providing the basic information on extreme wind climates for over 140 countries and territories Additional examples for many chapters in this book

Author: Nnabuihe Nnamani
Publisher:
ISBN:
Category :
Languages : en
Pages : 55

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Book Description
The advent of modern structural systems, spurred by advances in construction methodology and high strength materials, has driven the height of modern skyscrapers beyond what was once deemed possible. Although science and technology has been able to increase the strength of building materials such as steel and concrete, their material stiffness has remained virtually unchanged. The end result is a wave of taller, slender and more flexible skyscrapers that are very susceptible to wind-induced excitations. Ever mindful of the fact that human comfort levels are affected by perceived structural responses, engineers must employ various strategies to satisfy serviceability constraints. This thesis presents an overview, in addition to successful applications, of the various aerodynamic and damping modifications that are used to control wind-induced motion in tall buildings. Finally, a modified gyrostabilizer, akin to those used in luxury yachts, is proposed as a possible active control mechanism. The feasibility of this device was studied using simple statics and rigid body dynamics.

Author: David Yun Nin Yip
Publisher:
ISBN:
Category : Buildings
Languages : en
Pages : 256

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Author: Bernard Kim
Publisher:
ISBN:
Category :
Languages : en
Pages : 220

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Book Description
The Western University Aerodynamic Database (WAD) has been developed as an alternative means for structural engineers to estimate the preliminary design wind loads on tall buildings. The database consists of aerodynamic loads obtained from either the force-balance or pressure model tests on 56 tall buildings in their simulated actual surroundings carried out in the Boundary Layer Wind Tunnel Laboratory at Western University. The data for a given building include the statistics of the normalized aerodynamic loads such as the means, root-mean squares, and power spectral density functions of the base bending moments in two orthogonal directions and base torque. To estimate the preliminary design wind loads on a target building, the fuzzy logic theory is employed to select the reference buildings from the database whose aerodynamic characteristics and upstream conditions are similar to those of the target building. A modified three-dimensional moment gust loading factor approach is proposed to estimate the wind-induced responses of the target building for all wind directions. The WAD-based procedure for estimating the wind-induced responses is validated by comparing the estimated responses with the corresponding responses obtained from the force-balance or pressure model tests for 36 tall buildings included in WAD. The comparison suggests that the WAD-based procedure can provide reasonably accurate estimates of base moments and accelerations of tall buildings, and is therefore considered adequate to be used in their preliminary design. Finally, the wind-induced responses predicted using the WAD-based procedures are also compared with those obtained from the wind load provisions in three major design codes, i.e. ASCE 7-10, NBCC 2010 and AS/NZS 1170.2: 2011, as well as the NatHaz Aerodynamic Load Database developed at University of Notre Dame. The results of the comparison study show that the WAD-based predictions of the wind loads are more accurate than the above-mentioned methods, indicating that the WAD-based procedure is a viable alternative to evaluating the preliminary design wind loads for tall buildings.

Author: Yukio Tamura
Publisher: Springer Science & Business Media
ISBN: 4431543376
Category : Science
Languages : en
Pages : 414

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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.

Author: Peter Irwin
Publisher: Routledge
ISBN: 1317999959
Category : Technology & Engineering
Languages : en
Pages : 144

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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.

Author: Ahsan Karim
Publisher:
ISBN:
Category : Buildings
Languages : en
Pages : 116

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Book Description

Author: Wade H. Shafer
Publisher: Springer Science & Business Media
ISBN: 1475757794
Category : Science
Languages : en
Pages : 307

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Book Description
Masters Theses in the Pure and Applied Sciences was first conceived, published, and dis· seminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) *at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the ac· tivity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volume were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 20 (thesis year 1975) a total of 10,374 theses titles from 28 Canadian and 239 United States universities. We are sure that this broader base for theses titles reported will greatly enhance the value of this important annual reference work. The organization of Volume 20 is identical to that of past years. It consists of theses titles arranged by discipline and by university within each discipline.

Author: Wasin Thangthong
Publisher: International Transaction Journal of Engineering, Management, & Applied Sciences & Technologies
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 14

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Book Description
This paper presents the analysis of the modal correlation coefficient and the weighting factor for predicting wind load combination in tall buildings under wind loads by high-frequency force balance (HFFB) and high-frequency pressure integration (HFPI) in a wind tunnel. The results of the analysis and comparisons in terms of non-dimensional aerodynamic coefficients and base moments will be presented in this study, to determine whether the pressure tap on the model surface for the HFPI test is sufficiently dense. Results show good agreement between HFFB and HFPI for overall wind loads, modal correlation coefficients and weighting factors. Wind load combinations are revisited in the framework of modeling the resultant base moments in each direction. According to the findings, the across-wind load combination by weighting factor is higher than the across-wind load combination by AIJ 2004 standard for the along-wind maximum case for buildings with an aspect ratio of 1.0. In other cases, the combination of wind loads as determined by AIJ 2004 is greater than the combination of wind loads determined by the weighting factor.