Deterministic Torsional Building Response to Winds

by Carlos P. Patrickson, (M.ASCE), Sr. Engr.; Nucleotech, Montreal, Canada,
Peretz P. Friedmann, Assoc. Prof.; Mechanics and Structures Dept., School of Engrg. and Applied Sci., Univ. of Calif., Los Angeles, Calif.,


Serial Information: Journal of the Structural Division, 1979, Vol. 105, Issue 12, Pg. 2621-2637


Document Type: Journal Paper

Abstract: The dynamic response of tall buildings to wind loads, including the torsional degree-of-freedom, is investigated using a sinusoidal pseudo-turbulent representation of atmospheric gusts superimposed on a mean wind velocity. Torsional effects are due to the offsets between a hypothetical aerodynamic center and the cross-sectional center of mass relative to the elastic axis or both. Cases which were found to contain significant torsional response when using this deterministic approach show similar characteristics when analyzed by a probabilistic method. Thus it appears that the deterministic approach provides valuable physical insight to the problem. This is utilized in the paper for validating approximations associated with nonlinear terms in the wind loads and the time dependent portion of the aerodynamic damping.

Subject Headings: Wind loads | Torsion | Wind forces | Aerodynamics | Dynamic response | Degrees of freedom

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