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Title |
A Study on the Selection and Modification of Ground Motion Based on Site Response Analysis
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Authors |
황정현(Jung-Hyun Hwang) ; 목지욱(Ji-Wook Mauk) ; 손현실(Hyeon-Sil Son) ; 옥종호(Jong-Ho Ock) |
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DOI |
https://doi.org/10.11112/jksmi.2020.24.5.103 |
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Keywords |
입력지진파; 국내설계기준; 관심주기; 응답스펙트럼; 지반 종류; 지반 증폭; 부지응답해석; 표면지진파 bedrock motion; korea design standard; interest period; response spectrum; site class; site effect; site response analysis; surface motion |
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Abstract |
In the recent seismic design code KDS 41 17 00, selection and modification procedures of ground motions which are used for nonlinear dynamic analyses were adopted. However, its practical applications are still limited due to the lack of literatures. This paper introduces case studies which used site-response analyses to select and modify ground motions for nonlinear dynamic analyses. Based on the case studies, design criterion for site-response analyses were reviewed thoroughly in the viewpoint of practical applications. It was found that design requirements related with bedrock motions are too conservative that ground motions are selected and modified in the excessive manner. It is especially true for low-rise building structures with period ranges including acceleration-sensitive regions. Even though surface motions have shown appropriate responses, such building structures have to re-select and re-modify ground motions based on pre-analysis procedures rather than post-ones according to the current seismic design code. Also, it was observed that building structures with soft soils under strong ground motions need more comprehensive investigations on soil properties and efficient analysis methods in order to perform site-response analyses. This is due to the fact that lack of reliabilities on soil properties and analysis methods could result in unstable site-responses.
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