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Earthquakes and Structures   Volume 5, Number 6, December 2013, pages 657-678
Energy dissipation system for earthquake protection of cable-stayed bridge towers
Shehata E. Abdel Raheem and Toshiro Hayashikawa

Abstract     [Buy Article]
    For economical earthquake resistant design of cable-stayed bridge tower, the use of energy dissipation systems for the earthquake protection of steel structures represents an alternative seismic design method where the tower structure could be constructed to dissipate a large amount of earthquake input energy through inelastic deformations in certain positions, which could be easily retrofitted after damage. The design of energy dissipation systems for bridges could be achieved as the result of two conflicting requirements: no damage under serviceability limit state load condition and maximum dissipation under ultimate limit state load condition. A new concept for cable-stayed bridge tower seismic design that incorporates sacrificial link scheme of low yield point steel horizontal beam is introduced to enable the tower frame structure to remain elastic under large seismic excitation. A nonlinear dynamic analysis for the tower model with the proposed energy dissipation systems is carried out and compared to the response obtained for the tower with its original configuration. The improvement in seismic performance of the tower with supplemental passive energy dissipation system has been measured in terms of the reduction achieved in different response quantities. Obtained results show that the proposed energy dissipation system of low yield point steel seismic link could strongly enhance the seismic performance of the tower structure where the tower and the overall bridge demands are significantly reduced. Low yield point steel seismic link effectively reduces the damage of main structural members under earthquake loading as seismic link yield level decreases due their exceptional behavior as well as its ability to undergo early plastic deformations achieving the concentration of inelastic deformation at tower horizontal beam.
Key Words
    cable-stayed bridge towers; energy dissipation damper; seismic response; time history analysis; passive control; low yield steel
Shehata E. Abdel Raheem: Taibah University, Madinah Munawarh, KSA; Faculty of Engineering, Assiut University, Egypt
Toshiro Hayashikawa: Graduate School of Engineering, Hokkaido University, Sapporo, Japan

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