近断层脉冲型地震动作用下黏滞阻尼器减震结构能量分布与耗散研究  

Seismic Energy Distribution and Dissipation of Structures with Viscous Dampers under Near-fault Pulse-type Earthquakes

作　　者：吴亚丽[1] 黄欢 Wu Yali;Huang Huan(School of Civil Engineering and Architecture,Kaifeng University,Kaifeng 475000,Henan,China;China Metallurgical(Shanghai)Steel Structure Technology Co.,Ltd,Shanghai 200000,China)

机构地区：[1]开封大学,土木建筑工程学院,河南开封475000 [2]中冶(上海)钢结构科技有限公司,上海200000

出　　处：《震灾防御技术》2023年第3期604-613,共10页Technology for Earthquake Disaster Prevention

基　　金：国家重点研发计划(2017YFC0703403);开封市科技计划(1904044)。

摘　　要：为研究近断层脉冲型地震动对黏滞阻尼器减震结构抗震性能的影响,从结构在地震动作用下的能量分配与耗散机制角度进行探讨分析。基于结构能量平衡原理,利用MATLAB软件编写减震结构能量响应求解程序,利用该程序计算分析减震结构与无控结构在不同近断层脉冲型地震动作用下的能量分布特点,并分析减震结构在近断层非脉冲型和脉冲型地震动作用下的能量分布与结构变形的差异性,进一步揭示脉冲周期T_(p)对减震结构塑性耗能分布的影响规律。研究结果表明,在不同近断层地震动作用下,附设黏滞阻尼器的减震结构表现出了不同的减震效果,其塑性变形程度受结构自振周期与脉冲周期之比的影响较显著。当结构在遭遇地震之前的基本周期与脉冲周期之比T_(0)/T_(p)接近于1时,结构因共振效应导致其塑性变形显著增大,其地震损伤程度较严重;当T_(0)/T_(p)远大于1,或当T_(0)/T_(p)小于1且结构在遭遇地震之后的基本周期与脉冲周期之比T1/T_(p)同时远小于1时,减震结构可避开共振频段,其塑性变形显著减小,且在近断层脉冲型地震动作用下的抗震性能得到提高。To study the influence of near-fault pulse ground motion on the seismic performance of viscous damper damping structures,the energy distribution and dissipation mechanism of structures under earthquake are discussed and analyzed.A program for solving the energy response of the structure with viscous dampers is developed by software MATLAB based on the principle of energy balance,and the energy distribution characteristics of structures with and without dampers under different near fault pulse-type earthquakes are calculated and analyzed by using this program.At the same time,the difference of energy distribution and structural deformation results of the damping structure under near fault no-pulse and pulse ground motions is analyzed,and the influence of pulse period T_(p)on the plastic energy dissipation distribution of structures is further revealed.The results show that the plastic deformation of the structures is significantly affected by the ratio of fundamental vibration period to the pulse period.When T_(0)/T_(p)approaches‘1’,the plastic deformation increases significantly due to the resonance effect,and the seismic damage of the structures is more serious.When T_(0)/T_(p)is larger than‘1’,or T_(0)/T_(p)and T1/T_(p)are smaller than‘1’at the same time,the structure can avoid the resonance frequency band,thus the seismic performance of structures with dampers under near fault pulse-type earthquakes can be significantly improved.

关 键 词：减震结构 黏滞阻尼器 地震动 耗能机制 

分 类 号：TU352.1[建筑科学—结构工程]