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Loading Pattern and Spatial Distribution of Dynamic Wind Load and Comparison of Wind and Earthquake Effects along the Height of Tall Buildings

Author: Ali Bakhshi1 , Hamed Nikbakht1 1 Department of Civil Engineering, Sharif University of Technology, Tehran, Iran | Size: 829 KB | Format: PDF | Quality: Unspecified | Publisher: Proceedings of the 8th International Conference on Structural Dynamics, EURODYN 2011 Leuven, Belgium, 4-6 July 2011 G. De Roeck, G. Degrande, G. Lombaert, G. M¨ uller (eds. | Year: 2011 | pages: 8 | ISBN: 978-90-760-1931-4

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The aim of this study is that with respect to the procedure and distribution of dynamic wind and earthquake load,
to investigate the height beyond which the wind load would be dominant over the seismic loading condition. For the current
study, 5 tall steel frames buildings with various lateral resisting system that are almost symmetrical in plan are investigated via
three-Dimensional models. In this study, the effect of dynamic time history wind load is considered and when it’s applied along
the height of tall buildings, the fluctuating wind speed is simulated as an ergodic multivariate stochastic process, and the Fast Fourier Transform is needed to estimate the fluctuating wind speed components acting on the structure. The longitudinal wind load is considered in the following analysis neglecting the transverse and vertical wind load components. For two basic wind speed (47 m/s and 76 m/s) according to ASCE7-05, mean wind speed along the height was calculated and with accumulating this component with fluctuation wind speed component, wind speed along the height at each level can be computed. For the nonlinear dynamic analysis, 16 accelerograms are used that including 8 rock soil types and 8 deep soil types. Finally, One group of analyses are performed by simulating fluctuation wind speed under dynamic time history wind load and its counterpart, nonlinear dynamic earthquake load due to excitation from the ground motion earthquake accelerograms. This study determined that the structure with lower height or number of stories in which parameters dominant in seismic loading and with increasing in height of buildings, rate of influence of wind load along the height in which parameters is larger than seismic loading and the results of wind and earthquake characteristics was compared in form of power spectral density (PSD).

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