The effect of joint flexibility on the free elastic vibration characteristics of steel plane frames

Abstract The present work offers a simplified approach for establishing the effect of joint flexibility on the free vibration characteristics of steel plane frames. Based on the beam-to-column model of Eurocode 3, the presented analysis shows that within the elastic range and under certain combinations of the parameters involved, a transition to a higher vibration mode may occur, a finding of great importance for structural design purposes. Numerical results of an L-shaped steel frame, considered either rigid or semi-rigid, in tabular and graphical form, reveal the pronounced effect of the joint’s stiffness and its specific role especially on higher vibration modes, implying that the actual flexible joint behavior should be accounted for, even in the elastic range.

[1]  Eric M. Lui,et al.  Seismic analysis and response of multistory semirigid frames , 1999 .

[2]  A. N. Kounadis,et al.  The effect of longitudinal motion and other parameters on the bending eigenfrequencies of a simple frame , 1986 .

[3]  THE EFFECT OF AXIAL INERTIA ON THE BENDING EIGENFREQUENCIES OF A TIMOSHENKO TWO-BAR FRAME , 1986 .

[4]  T. Fujimoto,et al.  Vibration analysis of frames with semi-rigid connections , 1984 .

[5]  P.P.T. Chui,et al.  Transient response of moment-resistant steel frames with flexible and hysteretic joints , 1996 .

[6]  Vincenzo Piluso,et al.  Structural Steel Semirigid Connections: Theory, Design, and Software , 1999 .

[7]  Eric M. Lui,et al.  Dynamic analysis and response of semirigid frames , 1997 .

[8]  K. F. Chung,et al.  Composite column design to Eurocode 4 : based on DD ENV 1994-1-1: 1994 Eurocode 4: design of composite steel and concrete structures: part 1.1: general rules and rules for buildings , 1994 .

[9]  Faris Albermani,et al.  Dynamic response of flexibly jointed frames , 1995 .

[10]  Peter Pui-Tak Chui,et al.  Vibration and deflection characteristics of semi-rigid jointed frames , 1997 .

[11]  Miodrag Sekulovic,et al.  Dynamic analysis of steel frames with flexible connections , 2002 .

[12]  A. N. Kounadis,et al.  The coupling effect of axial motion and joint mass on the lateral vibrations of a rigid-jointed triangular frame , 1987 .

[13]  Siu Lai Chan,et al.  NONLINEAR VIBRATION ANALYSIS OF STEEL FRAMES WITH SEMIRIGID CONNECTIONS , 1994 .