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Wind-induced vibrations in high-rise buildings

Steffen, Fredrik LU (2016) In TVSM-5000 VSM820 20161
Structural Mechanics
Department of Construction Sciences
Abstract
Buildings are getting taller due to increased urbanisation and densification of cities. More advanced construction methods and the desire to construct impressive buildings is also supporting the trend. Due to their inherent slenderness resulting in low eigenfrequencies, these buildings are susceptible to wind-induced vibrations which can be highly disturbing for occupants. Already barely perceivable acceleration levels within the low-frequency range relevant to whole-body vibrations can cause nausea and discomfort, while high acceleration levels can cause alarm and fear amongst the occupants. The thesis summarises acceptable acceleration levels in high-rise buildings (here referred to as buildings over 200 m in height) stated in different... (More)
Buildings are getting taller due to increased urbanisation and densification of cities. More advanced construction methods and the desire to construct impressive buildings is also supporting the trend. Due to their inherent slenderness resulting in low eigenfrequencies, these buildings are susceptible to wind-induced vibrations which can be highly disturbing for occupants. Already barely perceivable acceleration levels within the low-frequency range relevant to whole-body vibrations can cause nausea and discomfort, while high acceleration levels can cause alarm and fear amongst the occupants. The thesis summarises acceptable acceleration levels in high-rise buildings (here referred to as buildings over 200 m in height) stated in different building codes and previous work on the subject. Equations for estimating acceleration in tall buildings in an early design stage are formulated. Accelerations of a high-rise building subjected to wind-loads are evaluated using a full numerical model and one reduced with Ritz-vectors and the results are compared. The thesis focusses on wind-load dynamics in early stages of the design process, with an intent to give an indication of the dynamic properties of a building. Finally some actions to reduce vibrations are discussed. (Less)
Popular Abstract
With an ever increasing population and more people moving to live in major cities the need to build higher buildings has literally skyrocketed. In 1913 the Woolworth Building in New York was the world's tallest building at 241 meters. Almost a century later the Burj Khalifa opened in 2010 with a record-breaking height of 830 meters. Just 10 years before that the tallest building in the world was the Petronas Towers at just 452 meter. Construction of a building higher than a kilometre is ongoing in Saudi Arabia.
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author
Steffen, Fredrik LU
supervisor
organization
course
VSM820 20161
year
type
H3 - Professional qualifications (4 Years - )
subject
keywords
wind, high-rise, tall buildings, ritz-vectors, dynamic analysis
publication/series
TVSM-5000
report number
TVSM-5211
ISSN
0281-6679
language
English
id
8890274
alternative location
http://www.byggmek.lth.se/english/publications/tvsm-5000-masters-dissertations/
date added to LUP
2016-09-29 11:12:45
date last changed
2016-09-29 11:12:45
@misc{8890274,
  abstract     = {Buildings are getting taller due to increased urbanisation and densification of cities. More advanced construction methods and the desire to construct impressive buildings is also supporting the trend. Due to their inherent slenderness resulting in low eigenfrequencies, these buildings are susceptible to wind-induced vibrations which can be highly disturbing for occupants. Already barely perceivable acceleration levels within the low-frequency range relevant to whole-body vibrations can cause nausea and discomfort, while high acceleration levels can cause alarm and fear amongst the occupants. The thesis summarises acceptable acceleration levels in high-rise buildings (here referred to as buildings over 200 m in height) stated in different building codes and previous work on the subject. Equations for estimating acceleration in tall buildings in an early design stage are formulated. Accelerations of a high-rise building subjected to wind-loads are evaluated using a full numerical model and one reduced with Ritz-vectors and the results are compared. The thesis focusses on wind-load dynamics in early stages of the design process, with an intent to give an indication of the dynamic properties of a building. Finally some actions to reduce vibrations are discussed.},
  author       = {Steffen, Fredrik},
  issn         = {0281-6679},
  keyword      = {wind,high-rise,tall buildings,ritz-vectors,dynamic analysis},
  language     = {eng},
  note         = {Student Paper},
  series       = {TVSM-5000},
  title        = {Wind-induced vibrations in high-rise buildings},
  year         = {2016},
}