Wind tunnel study on load combination including torsion for design of medium-rise buildings (original) (raw)

2013, Proceedings of the Eighth Asia-Pacific Conference on Wind Engineering

This paper presents a set of wind tunnel tests carried out to examine wind-induced overall structural loads on rectangular medium-rise buildings. Emphasis was directed towards torsion and its correlation with peak shear forces in transverse and longitudinal directions. Two building models with the same horizontal dimensions but different gabled-roof angles (0 o and 45 o) were tested at different full-scale equivalent eave heights (20, 30, 40, 50, and 60 m) in open terrain exposure for several wind directions (every 15 o). Along-wind force, across-wind force, and torsional moment were evaluated for the tested buildings. Maximum wind force component was given along with the other simultaneously observed wind force/moment components normalized by the overall peak. The study found that maximum torsion for wind in transverse direction is associated with 80% of the overall shear force perpendicular to the longer horizontal building dimension; and 45% of the maximum shear occurs perpendicular to the smaller horizontal building dimension. Comparison of the wind tunnel results with current torsion provisions in the American wind standard, the Canadian and European wind codes demonstrate significant discrepancies. The paper suggests load factor combinations to be used for rectangular buildings.

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