Jin-Sun Lee

Numerical Analysis of Cluster and Monopod Suction Bucket Foundation

Numerical analyses were performed to study the cluster suction bucket foundation performance in comparison with the monopod suction bucket foundation. The possibility of improving the resistance performance of suction bucket foundations by using cluster configuration was studied. Clustered foundations are formed by arranging multiple bucket foundations in relatively short distances among them. A model cluster foundation composed of three individual buckets was configured such that it has the same cross sectional area, length and total bucket weight to a monopod foundation. Results of numerical modeling are presented in the form of load-displacement curves. Vertical, horizontal and horizontal combined with moment load conditions were considered. The results show that the cluster type configuration improved the resistance performance of the foundations under typical loading conditions.Copyright

Seismic Behavior of Pile Supported Railway Track

Verification of nonlinear dynamic numerical analysis was performed using dynamic centrifuge test results for pile supported track under seismic loadings. The numerical analysis models were constructed in the same dimensions with the centrifuge tests in prototype scale. Verification was conducted by comparing the measurement data obtained from the centrifuge test and numerical analysis output directly. Total 4 different numerical models corresponding centrifuge test are verified with changing thickness of soft soil layer, embankment, input motion intensity and history. Numerical analyses were conducted in time domain by an explicit time integration method. Dynamic hysteretic damping model was adopted for nonlinearity behavior of soil under seismic excitation. The piles were modeled with shell element that can show interface behavior with surrounding soils. The other structural members are modeled in a hexahedron solid element that has an interface. Seismic responses of the pile supported track were quite similar for both numerical analysis and centrifuge test.

Seismic Bearing Capacity of Shallow Foundation Supporting Single-Degree-of-Freedom Structures

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...