Abstract
Current study is sought to study the effect of linear and nonlinear liquid viscous dampers on steel frames having dual systems of bending frame and divergent bracing. These frames were first designed according to regulations of Iran’s 2800 standard and tenth chapter of national regulations of construction (planning and performing steel construction) through equivalent static method then frames were modelled again in non-linear analysis software and time history non-linear analyses were done on them with installing viscous dampers on these frames using recorded near and far faults. In this study the effect of viscous dampers will be investigated on seismic behaviour of mentioned frames and results will be proposed in form of maximum graphs of relative displacements, stories lateral displacements, base shear maximum, waste energy graphs and dampers’ force-displacements. All non-linear analyses have been done in PERFORM-3D software.
Highlights
There are two kinds of steel structure system that include bending frame system and bracing system
Dual or combinational system is a kind of structural system where vertical loads mainly are tolerated by constructional frames and resistance is done against lateral loads by a set of braced frames or shear walls with set of bending frames [2]
The results of stories relative displacement graphs of study models are proposed in three modes of without damper, with linear viscous damper and with non-linear viscous damper. In these graphs light curves are related to models with chevron divergent bracings and other curves are related to diagonal divergent bracings
Summary
There are two kinds of steel structure system that include bending frame system and bracing system These structural systems can be used separately or together in constructional frames. Dual or combinational system is a kind of structural system where vertical loads mainly are tolerated by constructional frames and resistance is done against lateral loads by a set of braced frames or shear walls with set of bending frames [2]. Main duty of inactive control systems is reducing waste energy through entering structural parts to non-linear area [4] and with this action; damages to constructional frames will be reduced. One of these inactive energy waste systems is viscous dampers that are used in this study to control dual frames responses. It is noticeable that in this research, in our models, Chevron and diagonal divergent bracings are used and utilized viscos dampers are linear and non-linear dampers with damping power of 0.5
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