Ground motion spatial variability effects on seismic response control of cable-stayed bridges |
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| Authors: | Shehata E Abdel Raheem Toshiro Hayashikawa Uwe Dorka |
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| Institution: | Shehata E. Abdel Raheem1 , Toshiro Hayashikawa2 and Uwe Dorka3 1. Civil Engineering Department, Faculty of Engineering, Assiut University, Assiut 71516, Egypt 2. Bridge and Structural Design Engineering, Hokkaido University, Sapporo, Japan 3. Steel & Composite Structures, Kassel Universitt, Kassel 34125, Germany |
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| Abstract: | The spatial variability of input ground motion at supporting foundations plays a key role in the structural response of cable-stayed
bridges (CSBs); therefore, spatial variation effects should be included in the analysis and design of effective vibration
control systems. The control of CSBs represents a challenging and unique problem, with many complexities in modeling, control
design and implementation, since the control system should be designed not only to mitigate the dynamic component of the structural
response but also to counteract the effects of the pseudo-static component of the response. The spatial variability effects
on the feasibility and efficiency of seismic control systems for the vibration control of CSBs are investigated in this paper.
The assumption of uniform earthquake motion along the entire bridge may result in quantitative and qualitative differences
in seismic response as compared with those produced by uniform motion at all supports. A systematic comparison of passive
and active system performance in reducing the structural responses is performed, focusing on the effect of the spatially varying
earthquake ground motion on the seismic response of a benchmark CSB model with different control strategies, and demonstrates
the importance of accounting for the spatial variability of excitations. |
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| Keywords: | cable-stayed bridge vibration control earthquake spatial variation seismic design semi-active control |
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