Hidenori Tanaka

On the Estimation of Lateral Stiffness of Rahmen Frame considered Elastic Rotation Stiffness of Exposedtype Column Base

This investigation is carried out to clear the difference of lateral stiffness of rahmen frame due to various methods for elastic rotation stiffness of steel exposed-type column base . At first, a new formula for elastic rotation stiffness of steel exposed-type column base considered column axial force and concrere stiffness under base-plate is suggested. It is compared and discussed that lateral stiffness of rahmen frame by nonlinear elastic analysis using the suggested formula compared with the result by conventional elastic analysis using the formula by Architectural Institute of Japan.

Stress Transmission Mechanism in RC Footing Beam Supporting Exposed-type Corn Base with Unbonded Anchor Bolts

Experimental study was carried out to examine the effectiveness of arrangement of reinforcement in a footing beam for an exposed-type steel column base. In the study, location of horizontal anchor and amount of vertical reinforcement are selected as experimental parameters to investigate suitable arrangement of reinforcement. In the tests, a column base is loaded through a column subjected to horizontal and vertical loads at the top. Test results show that the column base reinforced by horizontal anchors, which are placed at the upper side of anchor plates, and by a few amount of vertical reinforcement does perform as well as that fully reinforced by vertical reinforcement.