消能伸臂体系的振动功率流  

Vibration Power Follow Analysis of the Damped Outrigger System

作　　者：刘良坤 潘兆东 谭平[2] 张尚荣[3] LIU Liangkun;PAN Zhaodong;TAN Ping;ZHANG Shangrong(School of Environment and Civil Engineering,Dongguan University of Technology,Dongguan 523808,China;School of Civil Engineering,Guangzhou University,Guangzhou 510405,China;School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China)

机构地区：[1]东莞理工学院生态环境与建筑工程学院,广东东莞523808 [2]广州大学土木工程学院,广东广州510405 [3]宁夏大学土木与水利工程学院,宁夏银川750021

出　　处：《土木工程与管理学报》2023年第1期20-26,共7页Journal of Civil Engineering and Management

基　　金：国家自然科学基金(51908129);国家重点研发计划(2019YFC1511004);广东省基础与应用基础研究基金项目(2020A1515110806);广州市建筑科学研究院有限公司科技进步资金项目(2021Y-KY02)。

摘　　要：消能伸臂体系改善了传统伸臂结构体系的内力突变问题,进一步提高了结构的抗震性能。为研究消能伸臂体系的振动能量分布与传递问题,并探讨其减震机理,利用有限元理论推导了消能伸臂体系的振动微分方程,结合有限元功率流分析方法,分析了外柱刚度比、伸臂阻尼系数对截面平均功率流变化的影响关系;同时也研究了简谐激励下各截面的能量分布与传递规律及地震激励下的最大截面瞬时功率流特征。结果表明:外柱刚度比适中时,存在最优伸臂阻尼系数;外柱刚度较大时,其截面最大平均功率流趋于常值;各截面功率流或功率流差基本朝向伸臂的附近单元,且消能伸臂起着能量吸收泵的作用;地震激励下,消能伸臂体系的各截面功率流较小,减震效果显著。Damped outrigger system was proposed to improve the internal force mutation problem of the traditional outrigger system, and that further enhance the structural seismic performance. To investigate vibration energy distribution and transmission of the damped outrigger system, and explore its damping mechanism, finite element theory was employed to derive the vibration differential equation of energy dissipating outrigger system;Combined with the finite element power flow analysis method, the study discussed the influence relationship of the stiffness ratio of external column, the damping coefficient of outrigger on the average power flow were analyzed. Also, the energy distribution and transfer law of each cross-section under harmonic excitation were investigated, and the characteristics of the maximum cross-section instantaneous power flow under seismic excitation were analyzed. The results show that the external column stiffness ratio is moderate, there is an optimal outrigger damping coefficient, and the external column stiffness ratio is large, the maximum average power flow of its cross section tends to be constant. The power flow or its difference of each cross section is basically toward the nearby unit of the outrigger, and the damped outrigger play the role of the energy absorption pumps. Under seismic excitation, the power flow of each section of the damped outrigger system is smaller, and the damped effect is significant.

关 键 词：消能伸臂 振动 有限元 功率流 减震 

分 类 号：TU352.1[建筑科学—结构工程] TU311.3