Preliminary Study on Basin Amplification Effect for Vertical Incidence of Two Kinds SH Pulse Waves

DOI

10.2991/dramclr-19.2019.41How to use a DOI?

Keywords

Basin amplification effect, basin models, numerical simulation, SH pulse waves, data analysis.

Abstract

Study of basin effect has important reference significance for future urban the planning of earthquake prevention and disaster reduction. The amplification effects of three ideal simple basin models, “square” shape, “inverted convex” shape and “curved” shape, were studied by using the finite element numerical simulation method of decoupled near-field wave combined with transmission boundary. The results show that: 1. Two kinds of basin models, “square” and “inverted convex”, show different rules of seismic response of basin position along with the depth of basin: the square basin model shows similar characteristics to the existing site response, while the calculation results of inverted convex basin model are more fit our existing basin knowledge. Therefore, it is not appropriate to study the amplification effect of basin earthquake ground motion only by using simple “square” basin model. 2. The seismic response of a more realistic "curved-edge" basin model is studied. The calculation results of the symmetric model show good regularity. A relatively large seismic response occurs in the center of the basin, which reflects the role of the “focusing effect” of the basin. The asymmetric basin model is located in the center of the basin and at the edge of the basin. Greater ground motion responses have been observed on both sides of the basin, even on the steeper edge of the basin, which is related to the “edge effect” of the basin; with the softening of the medium in the basin, the ground motion responses of the site in the basin gradually increase; with the increase of the stratification of the medium in the basin, the ground motion responses of the basin are larger. On the whole, the seismic response also tends to increase gradually, but there are also large differences in some locations of the basin, which reflects the complexity of the amplification effect of the seismic basin.

Copyright

© 2019, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Xueliang Chen
AU  - Jianlong Wang
AU  - Mengtan Gao
PY  - 2019/11
DA  - 2019/11
TI  - Preliminary Study on Basin Amplification Effect for Vertical Incidence of Two Kinds SH Pulse Waves
BT  - Proceedings of the Fourth Symposium on Disaster Risk Analysis and Management in Chinese Littoral Regions (DRAMCLR 2019)
PB  - Atlantis Press
SP  - 27
EP  - 32
SN  - 1951-6851
UR  - https://doi.org/10.2991/dramclr-19.2019.41
DO  - 10.2991/dramclr-19.2019.41
ID  - Chen2019/11
ER  -