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Simplified Design and Analysis of Structure with Additional Improved Toggle-brace-damper Systems

LI Bo1,LIANG Xing-wen2,XIONG Er-gang1 (1.School of Civil Engineering,Chang'an University,Xi'an 710061,Shaanxi,China;2.School of Civil Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,Shaanxi,China)  
An enhanced toggle-brace-damper installation configuration with the damper directly connected to the beam-column joint was introduced,and the magnification factors for damper displacement and force were investigated.Expression for prediction of equivalent linear viscous damping ratio provided by the enhanced toggle-damper-brace systems installed in a building was introduced.For practical application,a simplified design and analysis method of structure with additional improved toggle-brace-damper systems was proposed based on Chinese code for seismic design of response spectrum,in which the damping coefficients of the dampers proportional to the relative modal displacements in the corresponding stories were distributed over the height of a structure to satisfy the given performance objective.The validity of this method was verified by nonlinear dynamic analyses.The results show that compared with the conventional installation configurations of toggle-brace-damper and diagonal brace-damper,this improved damper installation configuration not only decreases significantly floor displacement response but also reduces story shear demands.
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