地震动广义动力放大系数谱及其特性研究

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (5) : 170-178.

论文

地震动广义动力放大系数谱及其特性研究

何浩祥，丁佳伟，程时涛

作者信息 +

Generalized dynamic amplification coefficient spectrum of ground motion and its characteristics

HE Haoxiang, DING Jiawei, CHENG Shitao

Author information +

文章历史 +

摘要

传统地震动力放大系数谱是根据地震动最大加速度和结构最大加速度而确定的，没有充分虑及时域非平稳性。通过比较不同周期结构最大反应出现时刻和地震动峰值出现时刻，验证极大峰值对结构反应同样有重要的作用。提出考虑若干极大峰值作用的等效动力放大系数谱的概念，计算不同场地类型下的统计谱并验证其保守性。鉴于考虑频域非平稳性的动力放大系数标准差谱的合理性，计算相关统计谱并确认其在长周期段谱值较高。综合考虑传统谱、等效谱和标准差谱的特点，基于三种谱外包络提出具有足够的保守性的广义动力放大系数谱的概念。建立广义动力放大系数谱与传统谱的比值拟合公式。通过算例验证按广义动力放大系数谱进行结构抗震设计或验算具有更高的安全性。

Abstract

The traditional seismic dynamic amplification factor spectrum is determined according to the maximum acceleration of ground motion and the maximum acceleration of structure, and the non-stationarity in time domain is not fully considered. By comparing the occurring time of maximum response of different periodic structures and the occurring time of peaks of ground motion, it is verified that the peak values play an important role in the structural response spectrum as well. The concept of equivalent dynamic amplification factor spectrum considering several maximal peak effects is proposed, and the statistical spectra with different site types are calculated and the conservativeness is verified. In view of the rationality of the standard deviation spectrum considering the non-stationarity in frequency domain, the corresponding statistical spectrum is calculated and its higher spectral value in long period is confirmed. Considering the characteristics of traditional spectrum, equivalent spectrum and standard deviation spectrum, the concept of general dynamic amplification factor spectrum with sufficient conservativeness is proposed based on three spectral envelopes. The fitting ratio formula of general dynamic amplification factor spectrum and traditional spectrum is presented. The analysis example shows that the seismic design or checking calculation based on the general dynamic amplification factor spectrum has higher safety.

导出引用

何浩祥，丁佳伟，程时涛. 地震动广义动力放大系数谱及其特性研究[J]. 振动与冲击, 2021, 40(5): 170-178

HE Haoxiang, DING Jiawei, CHENG Shitao. Generalized dynamic amplification coefficient spectrum of ground motion and its characteristics[J]. Journal of Vibration and Shock, 2021, 40(5): 170-178

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