ELASTIC ROTATIONAL RIGIDITY OF EXPOSED COLUMN-BASE

—In case of anchor bolt yield type—

Abstract

This paper presents a simple secant rotational rigidity evaluation formula for an exposed column-base that takes into account initial anchor bolt tensioning and column axial force. The applicability of this formula is confirmed through the loading tests and finite element analysis on a cantilever with an exposed column-base.
It is clarified that:
1. The rotational rigidity of a column-base varies with column axial force and initial anchor bolt tensioning.
2. The presented formula agrees closely with loading-tests results.