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NatHaz Aerodynamic Loads Database (NALD)

The NatHaz Aerodynamic Loads Database version 1.0 was established in the Fall of 2000 to provide the community access to wind tunnel test data for the determination of response quantities in the alongwind, acrosswind and torsional directions. This site serves as an important first step in establishing an online experimental database for use in the preliminary design of tall buildings. The interactive database will provide users with the value of the RMS base moment coefficient and the non-dimensional power spectrum resulting from force balance measurements on rigid models. The experimental data is available for all three response components and a series of structural shapes of varying dimension under two classes of wind conditions. This data, in conjunction with the procedure provided herein, will permit the user to determine the base bending moment on the structure, and then proceed with the desired response analysis (Zhou et al. 2003). As a result, NatHaz Aerodynamic Loads Database was recently introduced in the Commentary of ASCE 7-05 (C6.5.8) as an alternative means of assessing the dynamic wind load effects on high-rise buildings.

The recently re-designed NatHaz Aerodynamic Loads Database version 2.0, integrating the latest advances in data management and mining for interactive queries of aerodynamic load data and an integrated on-line analysis framework for determining the resulting base moments and equivalent static wind loads (ESWL) for survivability and accelerations for serviceability (habitability). The key feature of the new version is the flexibility its analysis module offers: users may select not only the data from the on-line NatHaz Aerodynamic Loads Database, but also may implement any arbitrary power spectral density (PSD) expression or wind tunnel-derived PSD data set for the evaluation of wind load effects on high-rise buildings. Thus it serves as a stand-alone analysis engine with its user-friendly analysis interface, which will be particularly useful for those who may not be very familiar with the details of the random vibration-based dynamic analysis procedure generally used in connection with HFBB measurements. The NatHaz Aerodynamic Loads Database version 2.0 is robust in that it can and will include additional data sets with more refined spectral resolution and ranges of reduced frequency to yield a comprehensive, simplified and efficient platform for e-analysis of high-rise buildings based on HFBB (Kwon et al. 2007).

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