高阻尼设计反应谱阻尼修正系数的评估

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (8) : 209-217.

论文

高阻尼设计反应谱阻尼修正系数的评估

卢皓1,2

作者信息 +

Evaluation of damping modification factor for high-damping design response spectra

LU Hao1,2

Author information +

文章历史 +

摘要

针对目前提出的多种阻尼修正系数计算公式，本文选取了120条II类场地强震记录建立了10、20、30%三种不同阻尼比的高阻尼反应谱，通过比较精确谱和近似谱对5种典型计算公式的适用性进行分析。鉴于位移谱和加速度谱之间的转换是建立在拟谱关系上，且这种关系仅在结构阻尼较小以及忽略正余弦差异时才成立，因此本文对适用于建立高阻尼加速度谱和位移谱的阻尼修正系数计算公式分别进行了评价。通过分析可知，对II类场地而言，Lin&Chang和中国建筑抗震设计规范建议的阻尼修正系数计算公式分别在估计高阻尼位移谱和加速度谱时有较好的适用性。

Abstract

The accuracy of five kinds of formulations were assessed by comparing exact and approximate response spectra for three different damping levels,namely 10%,20% and 30%,respectively.The comparison was referred to 120 ground motion records matched with Class II site condition.The most simple and straightforward solution to get the displacement spectra was to convert the acceleration spectra from seismic design codes using pseudo-spectral relationship,which was correct only for systems without damping,as well as sine and cosine relationship could be neglected.Consequently,it was necessary to evaluate separately for high-damping acceleration response spectra and high-damping displacement response spectra.The results show that the damping modification factors proposed by Lin & Chang is suitable for developing high-damping displacement response spectra,and the damping modification factors proposed by China code for seismic design of buildings is suitable for developing high-damping acceleration response spectra.

导出引用

卢皓1,2. 高阻尼设计反应谱阻尼修正系数的评估[J]. 振动与冲击, 2017, 36(8): 209-217

LU Hao1,2. Evaluation of damping modification factor for high-damping design response spectra[J]. Journal of Vibration and Shock, 2017, 36(8): 209-217

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