A simplified model for lateral load analysis of asymmetrical buildings

Abstract An analytical model is proposed for an approximate three-dimensional lateral load analysis of asymmetrical tall buildings, taking advantage of inherent features of typical buildings. The framing elements of the buildings are grouped into two sets of orthogonally intersecting bents modelled as shear-flexure beams. Both pure torsion and warping of thin members are included. The accuracy of the model is tested through three examples of different nature. The model can be used to analyse buildings with varying properties along the height of the building. Furthermore non-uniform lateral and torsional loads are permitted. Solution by the use of the finite-difference technique makes the model fast, economical and suitable for preliminary analysis on a small computer.