Abstract
In seismic performance evaluation of pile supported wharves, the evaluation which calculated bending moment reaches full plastic moment or not is mostly performed with bilinear elasto-plastic model of M-φ characteristics (the full plastic moment is applied as the maximum bending moment). Since local buckling occurs in steel pipe piles with a large diameter-to-thickness ratio, which are used frequently by economical design, strength declines without reaching full plastic moment. There is a concern that has become a dangerous design. On the other hand, strength of steel pipe piles with a small diameter-to-thickness ratio continues to increase modestly even after yielding, and they have toughness against deformation. These effects cannot be evaluated in the M-φ characteristics. Therefore, we have tried to formulate strength and deformation characteristics of steel pipe pile by using three dimensional FEM analysis using shell elements.
