2019 Volume 75 Issue 2 Pages I_563-I_568
In this research, we focused on developing an economical seismic retrofit method for pile supported wharf by retrofitting a buckling restrained brace as a damping member. The effective setup for damping member such as its layout, axial yield force and axial stiffness, and effect of frequency characteristic of input wave was examined through the non-liner finite element method. The targeted wharf have depth of 13 meters with five rows of steel pipe pile. The model consists of two types of sandy soil layer on the foundation as ground conditions, on which a rubble mound, L Shape Retaining Walls and backfill soil. The buckling restraint braces were installed between piles as its angles of 45 degrees, and the layout of installation were set between all the piles and between only two piles of the sea side. The effect of the retrofitting damping member was to reduce the maximum displacement of the wharf about 25% to 30% by sharing the bending moment of pile head with its energy absorption and reduction of rigidity. By appropriately selecting the axial yield force and rigidity against pile bending stiffness, we showed that reinforcement was obtained through balanced distribution of force on an existing structure.
