Dynamic characteristics of a novel damped outrigger system  

作　　者：Tan Ping Fang Chuangjie Zhou Fulin 

机构地区：[1]Earthquake Engineering Research & Test Center, Guangzhou University

出　　处：《Earthquake Engineering and Engineering Vibration》2014年第2期293-304,共12页地震工程与工程振动（英文刊）

基　　金：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.91315301-07;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.NCET-11-0914;the Guangzhou Ram Scholar Program Grant No.10A032D

摘　　要：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 high-rise building. An improved analytical model is developed by modeling the effect of the damped outrigger as a general rotational spring acting on a Bernoulli-Euler 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 effi ciency are verifi ed in comparison with those obtained from compatibility equations and boundary equations. Parametric analysis of three non-dimensional factors is conducted to evaluate the infl uences of various factors, such as the stiffness ratio of the core to the beam, position of the damped outrigger, and the installed damping coeffi cient. Results show that the modal damping ratio is signifi cantly infl uenced 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 outriggers.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 high-rise building. An improved analytical model is developed by modeling the effect of the damped outrigger as a general rotational spring acting on a Bernoulli-Euler 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 effi ciency are verifi ed in comparison with those obtained from compatibility equations and boundary equations. Parametric analysis of three non-dimensional factors is conducted to evaluate the infl uences of various factors, such as the stiffness ratio of the core to the beam, position of the damped outrigger, and the installed damping coeffi cient. Results show that the modal damping ratio is signifi cantly infl uenced 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 outriggers.

关 键 词：damped outrigger energy dissipation system high-rise building dynamic stiffness method dynamic characteristic parametric analysis 

分 类 号：TU973.31[建筑科学—结构工程]