场地参数对PGV非线性场地放大模型的影响对比研究

Influence of site parameters on the nonlinear site amplification model for PGV

摘要

地面峰值速度(peak ground velocity,PGV)是评估地震破坏性的关键强度参数之一,为探究不同场地参数对PGV场地放大模型的影响,本文利用516个KiK-net和K-NET台站场地波速剖面在912个不同强度地震动输入下的一维反应分析结果,选取场地周期(T_S)、地表30m等效剪切波速(T_VS30)、地表30米等效剪切波速和基岩深度的联合参数(T_VH)作为场地参数,分别建立3个PGV一维非线性场地放大模型,对比分析场地参数对线性场地反应预测值、非线性场地反应预测值以及预测不确定性的影响,结果表明:以T_VS30为场地参数的PGV一维非线性场地放大模型的标准差最小,拟合效果最好,以T_VH为场地参数的拟合效果最差,与基岩深度相关的参数T_S和T_VH在表征场地非线性反应时的效果不佳。因此,推荐场地参数T_VS30作为PGV场地放大模型的预测参数。所建模型及参数比选结果可为建筑结构抗震设计中PGV场地放大效应的量化评估提供参考。

Abstract

Peak ground velocity (PGV) is one of the key intensity parameters for evaluating seismic destructiveness. To investigate the influence of different site parameters on PGV site amplification models, this study employs one-dimensional (1D) soil-layer response analysis, using 912 ground-motion input records and 516 site shear-wave velocity profiles from KiK-net and K-NET stations. Three 1D nonlinear site amplification models for PGV were established by selecting site period (T _S), equivalent shear-wave velocity in the top 30 meters of the ground (T _VS30), and a combined parameter of T _VS30 and bedrock depth (T _VH) as site parameters. A comparative analysis was conducted on the predicted values of linear and nonlinear site responses as well as the prediction uncertainties of the three models. The results showed that: the 1D nonlinear PGV site amplification model with T _VS30 as the site parameter had the smallest standard deviation and the best goodness-of-fit, while the model with T _VH as the site parameter had the worst goodness-of-fit. In addition, parameters T _S and T _VH, which were related to bedrock depth, showed lower sensitivity. Therefore, T _VS30 is recommended as the site parameter for predicting PGV site amplification factors. The models established in this study and the comparison results can provide theoretical support and practical references for the quantitative evaluation of PGV site amplification effects in the seismic design of building structures.

关键词

场地条件 / 地面峰值速度 / 场地效应 / 场地反应分析 / 非线性场地放大模型

Key words

site conditions / peak ground velocity / site effect / site response analysis / nonlinear site amplification model

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基金资助

国家自然科学基金项目(51278432)

四川省自然科学基金青年基金项目(2025ZNSFSC1283)