巨型框架单段隔震悬挂结构减震效果分析  

Damping Effect of Mega-frame with Isolated Suspension Structure

作　　者：王学庆[1] 

机构地区：[1]安徽工业大学建筑工程学院,安徽马鞍山243032

出　　处：《安徽工业大学学报（自然科学版）》2017年第2期172-177,共6页Journal of Anhui University of Technology（Natural Science）

基　　金：安徽省教育厅重点项目(kJ2013A052)

摘　　要：针对具有较小水平刚度的橡胶隔震支座提出一种巨型框架隔震悬挂结构体系,建立其两质点动力简化计算模型,并与传统巨型框架悬挂结构体系的地震反应进行了对比分析。通过主结构相对位移在频域内的传递函数,分析其减震效果。依据频域分析所得结论建立三维有限元模型,采用两种典型地震波分析其位移响应。结果表明,主结构与悬挂结构的频率比和质量比对其减震效果的影响具有相关性,若频率比与0.1倍质量比之和不大于0.7,则减震效果可达40%以上;脉冲型地震动对主结构的减震效果有不利影响,但不会放大地震作用效应。In view of smaller horizontal stiffness of laminated rubber bearings,a new mega-frame with isolated suspension structure was proposed, and the two-mass simplified model of which was presented for dynamic analysis.The seismic responses of two cases were investigated for traditional mega-frame and the proposed new mega-frame with isolated-suspension structure respectively. For analyses of the damping effect, the relative displacements of main structure in both cases were compared based on frequency domain transfer function. According to the results of frequency analysis, three-dimensional finite element models were established and analyzed in time domain by two typical seismic wave. Results of analysis from both domains indicate the mass ratio and frequency ratio of mega-frame to suspension structure are correlative on damping effects. The relative displacement of mega-frame is reduced by more than 40% if the sum of frequency ratio and 10% mass ratio is not larger than 0.7. The damping effect on the mega-frame is negatively influenced by pulse-like ground motions, but seismic action effect is not be amplified.

关 键 词：巨型框架 隔震 悬挂结构 减震效果 

分 类 号：TU352[建筑科学—结构工程]