平原地区场地VS30经验预测方法——以华北平原北部北京地区为例

摘要

Earthquake ground motion prediction models usually define site conditions based onthe time-averaged shear wave velocity in the upper30m(VS30).Proxy-based estimationsof VS30are commonly used,if velocity measurements are not available.We compile a soilprofiledatabase for the Beijing plain area(China),using data from research documentsand technical reports.The database contains 479 soil profiles, 463 0f which have depthslarger than 30m. We develop regional relationships for the Beijing plain area forextrapolating the time-averaged shear wave velocity to a given depth less than 30 m toVS30, we then compare the performance of available models. We find that the second-orderpolynomial model based on data from Japan provides an overprediction, while the linear model calibrated on data from California,underestimates VS30.