Estimation of input energy spectrum from pseudo-velocity response spectrum incorporating the influences of magnitude, distance, and site conditions

Estimation of input energy spectrum from pseudo-velocity response spectrum incorporating the influences of magnitude, distance, and site conditions
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结合震级、距离和场地条件的影响,根据伪速度响应谱估计输入能量谱

DOI:
10.1016/j.engstruct.2022.115165
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发表时间:
2023-01
影响因子:
5.5
通讯作者:
Tsutomu Ochiai
Tsutomu Ochiai
中科院分区:
工程技术2区
文献类型:
--
作者:
Haizhong Zhang;Yan-Gang Zhao;Fang-Wen Ge;Yingchi Fang;Tsutomu Ochiai

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输入能量谱对于确定基于能量的抗震设计中的滞后能量需求是有用的信息。输入能量谱通常以能量等效速度谱 Veq 表示,可以根据 Veq 和 RS 之间的关系,从代码指定的响应谱 (RS) 轻松建立。 Veq-RS 关系的几种公式已经被开发出来;然而,它们都忽略了大小、距离和场地条件的影响。本研究的目的是提出 Veq 与伪速度响应谱 RSpv 之间关系的实用公式,其中考虑了幅度、距离和场地条件的影响。首先,为了探讨震级、距离和场地条件对Veq-RSpv关系的影响,提出了一种基于随机振动理论的Veq/RSpvis估计方法,并通过与传统时间序列分析计算值的比较进行了验证。研究发现,在这些参数中,震级通过改变地震动的频率成分对Veq/RSpv影响最大,长振荡周期下的Veq/RSpv值随着震级的增加而显着减小。然后,基于这些结论,利用日本 16,660 个真实的地震地面运动,开发了一个实用的 Veq/RSpv 公式,该公式结合了震级、距离和场地条件的影响。
The input energy spectrum is useful information for determining the hysteretic energy demand in energy-based seismic design. The input energy spectrum commonly expressed in terms of the energy equivalent velocity spectrum,Veq, can be easily established from the code-specified response spectra (RS) based on the relationship betweenVeqand RS. Several formulations for theVeq-RS relationship have been developed; however, all of them ignore the influences of magnitude, distance, and site conditions. The aim of this study is to propose a practical formulation for the relationship betweenVeqand the pseudo-velocity response spectrum,RSpv, incorporating the influences of magnitude, distance, and site conditions. Firstly, to explore the influences of magnitude, distance, and site conditions on theVeq-RSpvrelationship, an approach for estimatingVeq/RSpvis proposed based upon random vibration theory and verified by comparison with the values calculated by traditional time-series analysis. It is found that the magnitude influencesVeq/RSpvthe most among these parameters by changing the frequency content of the ground motion, and theVeq/RSpvvalues at long oscillator periods decrease significantly with an increasing magnitude. Then, based on these conclusions, a practicalVeq/RSpvformulation incorporating the influences of magnitude, distance, and site conditions was developed using 16,660 real seismic ground motions in Japan.
DOI: 10.6028/nbs.ir.82-2589
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