“Exact” Three-Dimensional Linear and Nonlinear Seismic Analysis of Structures with Two-Dimensional Models

Abstract

This paper presents a modeling technique by which a complete three-dimensional (3-D) structural analysis of a structure can be performed using two-dimensional (2-D) models, and hence 2-D software. The approach includes the effect of torsion, walls perpendicular and inclined to the direction of motion as well as walls with L, T, and H shapes in plan. Diaphragm displacements are easily modeled. The method can be used with linear and nonlinear analysis. Nonlinearity in the diaphragms can also be modeled with relative ease. Furthermore, unlike the conventional analysis that requires two 2-D models, one in each direction of motion, to model the 3-D structure, this approach requires only a single model.

The effect of vertical near-field ground motions on the collapse risk of high-rise reinforced concrete frame-core wall structures

“…Nonetheless, in terms of dual systems or buildings consisting of intersecting frames, no special provision has been presented by this method. Seeking for substituting procedures which can be used for nonlinear analysis of dual and irregular systems, Mehrain and Naeim (2003) proposed a technique which not only captures the effects of torsion and perpendicular walls but also can model the nonlinearity in the diaphragms. Regrettably, despite its advantages and accuracy, the method is still a bit difficult to use, especially in software with no GUI (Graphical User Interface), such as OpenSees.…”