Author: Oktay DEMİRDAĞ
Publishing Date: 2005
Volume 20 Issue 3
The assumptions of frame supports being fully rigid; storey masses being concentrated at the floor levels; distributed masses and shear deformations of the columns being neglected are frequently seen in dynamic analysis of frames because of less effort in calculation. In practice, however, columns may usually rotate and translate a little due to elastic behavior of soil. In this case, elastic support behavior can be modeled using elastic springs against translation and rotation at the column bases. In this study, free vibration of elastically supported columns is studied including shear deformation of the column and natural frequencies are obtained. Increasing effect of increasing rotational and translational spring coefficients at the column base and decreasing effect of increasing concentrated mass and its rotational inertia at the top of column on frequency values are presented in graphs.
Key Words: Flexural vibration; elastic support; shear effect; second order theory.