4-절점 EAS 요소의 개발 및 지반문제해석에 적용

Finite element formulation based ob Enhanced Assumed Strain (EAS) plane element (XPLANE) is formulated and applied to elasto-plastic geotechnical problems. It is identified that the EAS approach is excellent in removing the locking problem which is dominant for the conventional 4-node plane strain elements. The 4-node EAS element with 7 enhanced strain terms and full integration gives almost the same performance with the conventional 8-node plane element which requires large calculation effort and memory capacity. Benchmark tests and sample analyses show that the new element can reduce hardware resources required and be applied to large deformation geotechnical problems with reduced efforts. Analyses for 3 geotechnical problems indicated that the 4-node EAS element has almost same accuracy and better computational efficiency comparing to the conventional 8-node plane strain element.