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Journal of the Korean Society of Hazard Mitigation 2015;15(3):265-273.
Published online June 30, 2015.
Seismic Bearing Capacity of Shallow Foundation Supporting Single-Degree-of-Freedom Structures
Seismic Bearing Capacity of Shallow Foundation Supporting Single-Degree-of-Freedom Structures
Jin sun Lee, Dong Soo Kim, Jeong Gon Ha
Abstract
The seismic bearing capacity of a shallow foundation supporting a single degree-of-freedom (SDOF) structure is examined through dynamic centrifuge tests conducted with dry silica sand layers and through the results of three-dimensional numerical analyses in time domain with explicit time integration. The numerical analysis model were constructed in prototype scale corresponding that of cen-trifuge test. The numerical analysis results correspond with the dynamic centrifuge test measurements. Thus, time histories of the bearing pressure beneath the shallow foundation is estimated from the numerical analysis. To examine the seismic behavior of a shal-low foundation supporting a SDOF structure, two different seismic bearing capacity criteria were compared.
Key Words: Centrifuge test; Finite difference method; Numerical analysis; Seismic bearing capacity; Shallow foundation; Site response analysis
요지
규사모래지반에 대하여 동적원심모형 시험과 3차원 시간영역 양해법을 적용한 수치해석을 이용하여 단자유도 얕은 기초 구조물의 지진시 지지력 평가를 수행하였다. 수치해석은 동적원심모형 시험의 원형스케일로 시행되었다. 수치해석결과는 실험 계측결과와 매우 일치하는 해석결과를 나타내었다. 본 논문에서는 검증된 수치해석결과로 부터 기초면 하 접지압을 획득하여 지진시 지지력 평가를 실시하였다. 지진 시 지지력 평가는 현재까지 발표된 두 개의 지진 시 지지력 공식을 적용ㆍ비교하였다.
핵심용어: 동적원심모형시험; 유한차분법; 수치해석; 지진 시 지지력; 얕은기초; 부지응답해석
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