Verification of Nonlinear Numerical Analysis for Seismic Response of Single Degree of Freedom Structure with Shallow Foundation

Yun-Wook Choo; Jin-Sun Lee; Dong-Soo Kim

doi:10.7843/kgs.2013.29.3.29

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Verification of Nonlinear Numerical Analysis for Seismic Response of Single Degree of Freedom Structure with Shallow Foundation 비선형 수치해석을 통한 단자유도 얕은기초 구조물의 지진 응답특성 검증

31 March 2013. pp. 29-40

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Abstract

Seismic response of single degree of freedom system supported by shallow foundation was analyzed by using nonlinear explicit finite difference element code. Numerical analysis results were verified with dynamic centrifuge test results of the same soil profile and structural dimensions with the numerical analysis model at a centrifugal acceleration of 20 g. Differences between the analysis and the test results induced by the boundary conditions of control points can be reduced by adding additional local damping to the natural born cyclic hysteretic damping of the soil strata. The analysis results show good agreement with the test results in terms of both time histories and response spectra. Thus, it can be concluded that the nonlinear explicit finite difference element code will be a useful technique for estimating seismic residual displacement, earthpressure etc. which are difficult to measure during laboratory tests and real earthquake.

Keywords

Finite difference method

Seismic response

Soil-structure interaction

Hysteretic damping

Site response analysis

본 논문에서는 얕은기초를 가지는 단자유도 구조물의 지진시 응답특성을 시간영역 비선형 유한차분해석을 이용하여 살펴보았다. 해석결과는 중력가속도 20g에서 시행된 동일한 제원을 가지는 동적원심모형실험 결과를 통하여 검증되었다. 검증결과 실험과 해석의 통제운동지점 경계조건 차이에서 발생하는 차이는 지반의 비선형 거동특성으로 발생하는 이력감쇠에 지반의 감쇠비를 추가하여 감소시킬 수 있었다. 이로부터 얻어진 구조물과 지반에서 계측된 가속도 시간이력 및 주파수대역 응답곡선 모두 유사한 결과를 나타내어, 시간영역 비선형 유한차분해석을 통한 지반-구조물 상호작용 해석의 신뢰성을 확보할 수 있었으며, 향후 동적원심모형으로 계측이 어려운 구조물의 잔류변위, 작용토압 등을 효과적으로 판단할 수 있을 것으로 사료된다.

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Information

Publisher :The Korean Geotechnical Society
Publisher(Ko) :한국지반공학회
Journal Title :Journal of the Korean Geotechnical Society
Journal Title(Ko) :한국지반공학회 논문집
Volume : 29
No :3
Pages :29-40
Received Date : 2012-11-26
Accepted Date : 2013-02-05
DOI :https://doi.org/10.7843/kgs.2013.29.3.29

Journal of the Korean Geotechnical Society ISSN:1229-2427(Print) 2288-646X(Online) 한국지반공학회 논문집

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