2013 Volume 69 Issue 3 Pages 312-325
We proposed the bridge column integrated by multiple steel pipes and connected directly to piles with and without a footing in order to design a rational foundation of the proposed column. We compared a seismic response characteristic of the conventional substructure with a footing and proposed substructures, to reveal their characteristics and feasibility. As result of a case study by a pushover analysis and seismic response analysis, proposed substructures have advantages of a strain reduction of piles by a strain decentration at footing point. In addition, reduction in footing weight contributes to decrease pile strain in case of no footing. On the other hand the proposed substructure has the disadvantage of an increase in a strain of a pile and a displacement of piles. But it was revealed that a strain of piles decrease by using the beam in the ground. At the end, this study showed the proposed substructure has a sufficient seismic performance against lateral soil movement.