| Because of the large spanning capability and beautiful shape, Multi-Span Cable Stayed Bridges could satisfy the demands for transportation and aesthetics and are rapidly gaining in popularity both at home and abroad. Long-span bridges provide unique and thus heavily traveled transportation options; a subsequent loss of such a bridge to earthquake damage would have both heavy long term economic consequences and severely impact disaster relief work. Therefore the safe and effective design of earthquake resistant cable-stayed bridges is of great importance.This thesis investigates a long-span, three-tower cable-stayed bridge for spectrum response, time-history analysis and traveling wave effects. The main work has been listed below:1. Using finite element method (FEM), a spatial finite element model of a long-span, three-tower cable-stayed bridge has been established in ANSYS. The dynamic characteristics of two models (three-tower, cable-stayed bridge with piles and without piles) has been analyzed.2. The three-tower, cable-stayed bridge model has been analyzed using the response spectrum method under two different boundary conditions, with or without piles, to discuss the effect of pile-soil interaction.3. The non-pile, three-tower, cable-stayed bridge model under uniform excitation has been analyzed, using time-history analysis. The spectrum response analysis is compared with time-history analysis with regard to seismic design.4. The non-pile, three-tower cable-stayed bridge model under the effect of a traveling wave has been analyzed by the large mass method. This leads to a discussion of the relationship of view-speed and the traveling wave effect, and provides a reference for future design and analysis of multi-tower cable-stayed bridges with respect to the threat of seismic activity.5. The tower model has been analyzed using time-history method to discuss safety measures used to mitigate the seismic effects activity during construction of cable-stayed bridges. |
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