Dynamic Response of a Building with Dual System

by Subodh K. Das, Kling-Lindquist Partnership Inc, United States,

Abstract: The paper presents the dynamic response of a 30-story building with dual system consisting of cross-bracing and beam-column moment resisting frames. Two types of beam-column connections, namely Type FR (fully restrained) construction and Type PR (partially restrained) construction with 'Simple Framing' approach have been used in the moment resisting frames. Five models of the dual system have been developed by using several combinations of Type FR and Type PR (simple framing) beam-column connections at selected levels. The basic model consists of cross-bracing and the moment resisting frame with Type FR connection at all levels to develop the maximum possible stiffness of the dual system. Use of Type PR (simple framing) beam-column connections at all levels generated a model with only the cross-bracing resisting the lateral load. Final selection of a dual system resulted in a lateral load resisting system with weight of cross-bracing reduced to an average 5.1 psf of the floor area.

Subject Headings: Frames | Beam columns | Building systems | Lateral loads | Connections (structural) | Structural analysis | Moment (mechanics) | Structural models

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