Development of Large Deformation Analysis System for Geotechnical Problems: A Performance-based Design Tool of Tower-Foundation-Soil Coupled System

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A three-dimensional soil-foundation-structure coupled interaction analysis of transmission tower is performed to investigate the strength and stability of the entire system. Fully nonlinear elastoplastic finite element analysis is conducted to capture the progressive and localized failure of the foundations and the buckling behavior of the tower structure. In the series of analyses, various landforms, load directions and neighboring of the group piles are considered to evaluate the performance of the foundation under actual condition. The coupled analysis of the entire system reveals that uplift and horizontal displacement of the foundation are influential on the collapse behavior of transmission tower systems. Moreover, it is pointed out that the critical component in the collapse of the entire system drastically changes depending on the direction and mode of external load-The numerical results have led to a useful insight concerning the failure mechanism in the pre-existing example of tower collapse.