Type of Document Dissertation Author Janajreh, Isam Mustafa II Author's Email Address email@example.com URN etd-32198-124554 Title Wavelet Analysis of Extreme Wind Loads on Low-Rise Structures Degree PhD Department Engineering Mechanics Advisory Committee
Advisor Name Title Hajj, Muhammad R. Committee Chair Heller, Robert E. Committee Member Kohler, Werner E. Committee Member Mook, Dean T. Committee Member Ragab, Saad A. Committee Member Tieleman, Henry W. Committee Member Keywords
- pressure coefficients
- turbulence intensities
- turbulence scales
- wind loads
- higher-order statistics
Date of Defense 1998-01-29 Availability unrestricted AbstractOver the past thirty years, extensive research has been conducted with the objective of reducing wind damage to structures. Wind tunnel simulations of wind loads have been the major source of building codes. However, a simple comparison of pressure coefficients measured in wind tunnel simulations with full-scale measurements show that the simulations, in general, underpredict extreme negative pressure coefficients. One obvious reason is the lack of consensus on wind tunnel simulation parameters.
The wind in the atmospheric surface layer is highly turbulent. In simulating wind loads on structures, one needs to simulate the turbulent character besides satisfying geometric and dynamic similitudes. Some turbulence parameters that have been considered in many simulations include, turbulence intensities, integral length scales, surface roughness, and frequency spectrum. One problem with these parameters is that they are time varying in the atmospheric boundary layer and their averaged value, usually considered in the wind tunnel simulations, cannot be used to simulate pressure peaks.
In this work, we show how wavelet analysis and time-scale representation can be used to establish an intermittency factor that characterizes energetic turbulence events in the atmospheric flows. Moreover, we relate these events to the occurrence of extreme negative peak pressures.
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