Wind Load Combinations on Tall Buildings by High-Frequency Force Balance and High-Frequency Pressure Integration
Wind Load Combinations on Tall Buildings by High-Frequency Force Balance and High-Frequency Pressure Integration

Author: Wasin Thangthong

Publisher: International Transaction Journal of Engineering, Management, & Applied Sciences & Technologies

Published: 2022-06-24

Total Pages: 14

ISBN-13:

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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.

Wind Tunnel Testing of High-Rise Buildings
Wind Tunnel Testing of High-Rise Buildings

Author: Peter Irwin

Publisher: Routledge

Published: 2013-06-19

Total Pages: 144

ISBN-13: 1317999959

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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.

Wind-induced Motion of Tall Buildings
Wind-induced Motion of Tall Buildings

Author: Kenny C. S. Kwok

Publisher:

Published: 2015

Total Pages: 66

ISBN-13: 9780784413852

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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.

Prediction of Wind Loads on Tall Buildings
Prediction of Wind Loads on Tall Buildings

Author: Bernard Kim

Publisher:

Published: 2013

Total Pages: 220

ISBN-13:

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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.

Design of Buildings for Wind
Design of Buildings for Wind

Author: Emil Simiu

Publisher: John Wiley & Sons

Published: 2011-09-23

Total Pages: 262

ISBN-13: 1118077377

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ASCE 7 is the US standard for identifying minimum design loads for buildings and other structures. ASCE 7 covers many load types, of which wind is one. The purpose of this book is to provide structural and architectural engineers with the practical state-of-the-art knowledge and tools needed for designing and retrofitting buildings for wind loads. The book will also cover wind-induced loss estimation. This new edition include a guide to the thoroughly revised, 2010 version of the ASCE 7 Standard provisions for wind loads; incorporate major advances achieved in recent years in the design of tall buildings for wind; present material on retrofitting and loss estimation; and improve the presentation of the material to increase its usefulness to structural engineers. Key features: New focus on tall buildings helps make the analysis and design guidance easier and less complex. Covers the new simplified design methods of ASCE 7-10, guiding designers to clearly understand the spirit and letter of the provisions and use the design methods with confidence and ease. Includes new coverage of retrofitting for wind load resistance and loss estimation from hurricane winds. Thoroughly revised and updated to conform with current practice and research.

Wind Loading of Structures
Wind Loading of Structures

Author: John D. Holmes

Publisher: CRC Press

Published: 2001-06-14

Total Pages: 380

ISBN-13: 9780419246107

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Bridging the gap between wind and structural engineering, Wind Loading of Structures is essential reading for practising civil, structural and mechanical engineers, and graduate students of wind engineering, presenting the principles of wind engineering and providing guidance on the successful design of structures for wind loading by gales, hurricanes, typhoons, thunderstorm downdrafts and tornados.