Dynamic characteristics of a novel damped outrigge

Authors: Ping Tan Chuangjie Fang Fulin Zhou

Publish Date: 2014/05/31

Volume: 13, Issue: 2, Pages: 293-304

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Abstract

This paper presents exact analytical solutions for a novel damped outrigger system in which viscous dampers are vertically installed between perimeter columns and the core of a highrise building An improved analytical model is developed by modeling the effect of the damped outrigger as a general rotational spring acting on a BernoulliEuler beam The equivalent rotational spring stiffness incorporating the combined effects of dampers and axial stiffness of perimeter columns is derived The dynamic stiffness method DSM is applied to formulate the governing equation of the damped outrigger system The accuracy and efficiency are verified in comparison with those obtained from compatibility equations and boundary equations Parametric analysis of three nondimensional factors is conducted to evaluate the influences of various factors such as the stiffness ratio of the core to the beam position of the damped outrigger and the installed damping coefficient Results show that the modal damping ratio is significantly influenced by the stiffness ratio of the core to the column and is more sensitive to damping than the position of the damped outrigger The proposed analytical model in combination with DSM can be extended to the study of structures with more outriggersSupported by 973 Program under Grant under Grant No 2012CB723304 It was partially supported by the Major Research Plan of the National Natural Science Foundation of China under Grant No 9131530107 and in part by Program for Changjiang Scholars and Innovative Research Team in University under Grant No IRT13057 the Ministry of Education Program for New Century Excellent Talents in University under Grant No NCET110914 and the Guangzhou Ram Scholar Program Grant No 10A032D

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