用随机减量法计算消能减震结构附加阻尼比  

CALCULATION OF ADDITIONAL DAMPING RATIO OF ENERGY DISSIPATION STRUCTURE BY RANDOM DECREMENT METHOD

作　　者：任向鑫[1] 闫维明[1] 何浩祥[1] 

机构地区：[1]北京工业大学工程抗震与结构诊治北京市重点实验室,北京100124

出　　处：《工业建筑》2013年第S1期133-137,160,共6页Industrial Construction

基　　金：国家自然科学基金项目(51108009;50878010);高等学校博士学科点专项科研基金项目(20111103120022)

摘　　要：在消能减震设计中,附加阻尼比直接影响到地震影响系数的大小,也是评价消能减震方案的重要宏观指标。针对现有的由结构响应计算附加阻尼比的方法存在计算繁琐且不够准确等不足,将随机减量法运用在消能结构阻尼比的计算中,即从结构的地震响应信号中提取自由振动衰减信号,从而很方便地利用对数衰减法确定消能结构的阻尼比。算例结果表明,该法可以近似地分析减震结构耗能随振动强度和时间的变化。最后采用工程实例介绍消能减震结构的分析以及阻尼比的计算方法,并通过其来评价两种消能方案,从而为消能减震结构设计提供参考。由随机减量法计算得到的阻尼比作为一个重要评价指标可以在今后的设计中应用。Additional damping ratio is not only affecting the size of the seismic influence coefficient directly,but also a significant parameter to evaluate the scheme of energy dissipation in the energy dissipation structure.Due to the method of calculating additional damping ratio from structural response was tedious and not accurate enough at present.This study is to focus on a new method,in which the random decrement method is used in the calculation of energy dissipation structure damping ratio,and turns the structural seismic response signal into free vibration signal,thus damping ratio of energy dissipation structure is easily achieved by logarithmic decrement method.Example shows and approximates the change of energy dissipation with vibration intensity and duration.At last,engineering example is taken by this energy dissipation structure analysis and the damping ratio calculation method,through which the two kinds of energy dissipation schemes are evaluated,so as to provide reference for the design of energy dissipation structure in the future.

关 键 词：随机减量法 消能减震 附加阻尼比 地震动 

分 类 号：TU352.1[建筑科学—结构工程]