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On the effect of large deflection on nonlinear behavior of an eccentric bracing system
Author(s) -
Rasekh Ali,
Mofid Massood,
Khezrzadeh Hamed
Publication year - 2008
Publication title -
the structural design of tall and special buildings
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.895
H-Index - 43
eISSN - 1541-7808
pISSN - 1541-7794
DOI - 10.1002/tal.386
Subject(s) - bracing , structural engineering , concentric , nonlinear system , diagonal , stiffness , eccentric , deflection (physics) , engineering , mathematics , brace , physics , geometry , classical mechanics , quantum mechanics
In this article, a particular off‐center bracing system is introduced. In this system, the tensile diagonal strut is not straight. When the load is applied, the original geometry changes and thus causes the system to harden. Based on this behavior, a step‐by‐step analytical method is developed. Using this method, a Geometrically Nonlinear Analysis Program (GNAP) is designed to analyze the elastic force–displacement relation. Extension of this program to dynamic analysis led to a Dynamic Nonlinear Analysis Program (DNAP). The object of this article is to show that such bracing systems will lead to less seismic force on such structures compared to classic concentric bracing systems. On the other hand, it will be shown that the bracing system causes semi‐uncoupling of structure, and that the probable excursions in the nonlinear range during severe earthquakes will not cause significant deterioration in its strength and stiffness. Copyright © 2007 John Wiley & Sons, Ltd.