Friction Based Semi-Active Control of Cable-Stayed Bridges
Journal of Structural Engineering Vol.53A (March 2007)
JSCE
Friction Based Semi-Active Control of Cable-Stayed Bridges
Shehata E. ABDEL RAHEEM *, Uwe E. DORKA ** and Toshiro HAYASHIKAWA ***
* ** ***
Dr.-Eng., JSPS fellow, Hokkaido University, Assist. Professor, Assiut University, Assiut 71516, Egypt.
Dr.-Eng., Professor, Steel & Composite Structures, Kassel University, Kurt-Wolters-Strasse 3, Kassel 34125, Germany.
Dr.-Eng., Professor, Graduate School of Engineering., Hokkaido University, Nishi 8 Kita 13 Kita-ku, Sapporo 060-8628, Japan.
With the rapid increase of bridge spans, research on controlling earthquake-induced vibration of long-span bridges has been a problem of great concern. The concept of varying the normal force in a frictional interface is investigated to enhance the energy dissipation from a vibrating structure and improve the seismic performance of bridge structures. A semi-active optimal control algorithm is formulated to determine the controllable clamping force of a variable friction device; this algorithm uses measurements of the absolute acceleration and device relative displacements for determining the control action to ensure that the algorithm would be implementable on a physical structure. The friction device UHYDE-fbr is designed and manufactured such that the normal force in the friction interface can be influenced with air pressure chamber, hence the normal force and friction damping can be controlled. The friction device is a controllable energy dissipation device that cannot add mechanical energy to the structural system; the proposed control strategy is fail-safe in that bounded-input, bounded-output stability of the controlled structure is guaranteed. The numerical results demonstrated that the performance of the presented control design is nearly the same as that of the active control system; and that the friction device can effectively be used to control seismically excited cable-stayed bridges with
JSCE
Friction Based Semi-Active Control of Cable-Stayed Bridges
Shehata E. ABDEL RAHEEM *, Uwe E. DORKA ** and Toshiro HAYASHIKAWA ***
* ** ***
Dr.-Eng., JSPS fellow, Hokkaido University, Assist. Professor, Assiut University, Assiut 71516, Egypt.
Dr.-Eng., Professor, Steel & Composite Structures, Kassel University, Kurt-Wolters-Strasse 3, Kassel 34125, Germany.
Dr.-Eng., Professor, Graduate School of Engineering., Hokkaido University, Nishi 8 Kita 13 Kita-ku, Sapporo 060-8628, Japan.
With the rapid increase of bridge spans, research on controlling earthquake-induced vibration of long-span bridges has been a problem of great concern. The concept of varying the normal force in a frictional interface is investigated to enhance the energy dissipation from a vibrating structure and improve the seismic performance of bridge structures. A semi-active optimal control algorithm is formulated to determine the controllable clamping force of a variable friction device; this algorithm uses measurements of the absolute acceleration and device relative displacements for determining the control action to ensure that the algorithm would be implementable on a physical structure. The friction device UHYDE-fbr is designed and manufactured such that the normal force in the friction interface can be influenced with air pressure chamber, hence the normal force and friction damping can be controlled. The friction device is a controllable energy dissipation device that cannot add mechanical energy to the structural system; the proposed control strategy is fail-safe in that bounded-input, bounded-output stability of the controlled structure is guaranteed. The numerical results demonstrated that the performance of the presented control design is nearly the same as that of the active control system; and that the friction device can effectively be used to control seismically excited cable-stayed bridges with
References: Steel Research, Vol. 58, pp. 71-97, 2002. (2WCSC), Kyoto, Japan, Proceedings, pp.1687–1694, 1998. pp. 524-534, 2003. 16) Park, Y.J., Wen, Y.K. and Ang, A.H.S., Random vibration of hysteretic system under bi-directional ground motions, Earthquake Engineering and Materials and Structures, Vol 17) MATLAB 1994 The Math Works, Inc., Natick, MA (Received: September 11, 2006)