Evaluation of Bearing Capacities of Large Size Non-welded Composite Piles by 3-Dimensional Numerical Analysis

*Geotech. Eng'g Research Div., SOC Research Inst., KICT, Goyang -Si, Korea**Dept. of Civil Eng., Dong-A University, Busan, KoreaKEY WORDS: Large size PHC pile 대구경 PHC 말뚝, Non-welded composite pile 무용접 복합말뚝, Finite element analysis 유한요소해석, Bearing capacity 지지력, Pile load test 말뚝재하실험ABSTRACT: Recently, as large structures, which should support large desig n loads have been constructed, the study on the large diameter composite pile becomes necessary. The large diameter composite pile has the diameter over 700mm and consists of two parts of t he upper steel pipe pile and the lower PHC pile by a mechanical joint. In this research, to analyze the bearing capacity and the material strength of the composite pile, three dimensional numerical analyses were performed. First, the numerical modeling method was verified by comparing the calculated load-movement curves of the pile with those of the field pile l oad tests. Then, a total of twelve analyses were performed by varying pile diameter and loading direction for three pile types of PHC, steel pipe a nd composite piles. The results showed that the vertical and th e horizontal load-movement curves of the composite pile were identical with those of the steel pipe pile and the horizontal material strength of the composite pile was 60-80% larger than that of the PHC pile. 교신저자 김성렬: 사하구 하단 2동 840번지, 051-200-7622, sungryul@dau.ac.kr