地震动频谱特性对阻尼优化的影响

Effect of Earthquake Frequency Content on Damping Optimization

本文主要研究地震动频谱特性对阻尼优化的影响,利用简化顺序搜索法(SSSA)对某结构进行阻尼优化分析。分析过程中,通过A/V将30条地震动分为低、中、高三种,基于相同性能目标,分析三类地震动作用下的阻尼优化结果。结果表明:地震动频谱特性对阻尼优化的影响显著。对所分析结构而言,通常情况下,A/V越低的地震动下基于相同性能目标所需要布置的阻尼总量越大,低、中、高A/V地震动下所需平均阻尼c分别为20. 01,7. 94,3. 75 k N·s/cm。阻尼优化布置主要集中于底层,随着A/V的增大,上部楼层布置阻尼的效率提高,即相对于低、中A/V地震动,高A/V地震动下阻尼优化布置则趋向于结构上层。本文的结论对减震优化设计有一定的参考价值。

This paper made studies on the effect of frequency content of ground motions on damping optimization,damping optimization was discussed with the method of simplified sequence search(SSSA)for this structure.During the analysis,30 ground motions were divided into low,intermediate and high ones by A/V(peak ground acceleration/peak ground velocity),and based on the same performance target,damping optimization under three kinds of ground motions was given.The result indicates that frequency content of ground motion has a significant impact on damping optimization.For this structure,in general,the lower A/V of ground motion is,the more total damping will be required based on the same performance target,the average damping C required for ground motions with low,intermediate and high A/V is 20.01,7.94,3.75 kN·s/cm respectively.Damping locations are mainly focused on the first floor,as A/V increases,damping of the upper floors increases,it means that contrast to ground motions with low and intermediate A/V,the damping location under high A/V ground motion tends to the upper structure.The conclusion of this paper has certain reference value for damping optimization design.