隔震结构改进等效线性化设计方法研究

Study on improved equivalent linearization method in design of seismic isolated structure

采用现有10种等效周期及等效阻尼比计算公式配合中国《建筑抗震设计规范》(简称《抗规》)加速度谱的等效线性化方法,对100个隔震模型进行位移估算。发现难以取得高精度的位移估算结果。基于此,提出等效周期和等效阻尼比的改进计算方法,用于《抗规》加速度谱进行隔震结构等效线性化设计,并讨论了地震强度、特征周期以及地震动特性对改进方法的位移估算精度的影响。结果表明:地震强度、特征周期以及地震动特性对改进方法的位移估算精度均有一定影响,但绝大部分位移估算精度能够控制在±20%内,并且大部分可控制在±10%内。

The displacement of 100 isolated models was estimated by using the equivalent linearization method of Acceleration spectrum of《Code for Seismic Design of Building》with 10 existing equivalent period and equivalent damping ratio formulas.It shows that it is difficult to obtain high precision displacement estimation results.Based on this,an improved calculation method of equivalent period and equivalent damping ratio is proposed for equivalent linearization design of isolated structures with Chinese《Code for Seismic Design of Building》acceleration spectrum.The effects of seismic intensity,characteristic period and ground motion on the displacement accuracy of the improved method are also discussed,and the results show that the seismic intensity,characteristic period and ground motion have certain influence on the displacement estimation accuracy of the improved method,but the vast majority of the displacement estimation accuracy can be controlled within±20%,and most of it can be controlled within±10%.