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ABSTRACT
The new formulae with three factors and one factor for calculating the stress reduction coefficient rd at depths of 0–50 m are proposed in this paper. A more reliable database of rd curves is established using models for actual sites, the corresponding real seismic records from the KiK-net downhole array. Then, a quantitative analysis of the factors influencing rd is performed, and the important factors affecting rd are reasonably selected. The basic pattern of the rd curves and their unified mathematical expression for depths of 0–50 m are determined and the three-factor and one-factor formulae for calculating rd are presented.
Additional information
Funding
This research is jointly supported by the Scientific Research Fund of the Institute of Engineering Mechanics, China Earthquake Administration [Grant No. 2019A01] and the National Key Research and Development Plan for International Cooperation [Grant No. 2016YFE0105500]. This research is based on the seismic motion records and site information of KiK-net database provided by NIED (National Research Institute for Earth Science and Disaster Resilience).