Seismic Behaviour of Cable-Stayed Bridges: Design, Analysis and Seismic Devices

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SEISMIC BEHAVIOUR OF CABLE-STAYED BRIDGES:DESIGN, ANALYSIS AND SEISMIC DEVICES

Author: Alfredo Cámara Casado | Size: 26.6 MB | Format: PDF | Quality: Unspecified | Publisher: Department of continuum mechanics and theory of structures | Year: Octob er 2011 | pages: 144

he so cial and economical imp ortance of long-span bridges is extremely large; cable- stayed bridges currently span distances ranging from 200 to even more than 1000 m, representing key p oints along infrastructure networks and requiring an outstanding knowledge of their seismic resp onse. The ob jective of the study is three-fold; (i) to discern how pro ject decisions aect the seismic b ehaviour of cable-stayed bridges; (ii) to shed light on appropriate analysis strategies in order to address their linear
and nonlinear dynamic resp onse; and (iii) to compare dierent control schemes with passive seismic devices disp osed along the towers.
The organization of the content follows a natural progression, starting with the motivation of the work and presenting the state of art on this topic, followed by the description of the framework where the research is develop ed; the studied structures
and the simplifying assumptions employed throughout the do cument are clearly dened. Mo dal analysis of these bridges precedes the presentation of the seismic action and the validation of the accelerograms which have b een used. At this p oint, the discussion ab out the seismic results starts with a chapter completely devoted to the linear and nonlinear analysis pro cedures available to date, b eing followed by the comparison of the elastic and inelastic resp onse of cable-stayed bridges, fo cused
on the eect of dierent pro ject decisions. Finally, several control strategies with seismic devices are addressed in order to maintain the towers in the elastic range. The main conclusions are drawn to close the thesis, and new lines of research are suggested.

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