Effect and mechanism of stiffness distribution and sag-span ratio of main cables on structural dynamic characteristics and flutter performance of multi-cable suspension bridges
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引用次数: 0
Abstract
By incorporating extra load-carrying main cables, multi-cable suspension bridges provide increased flexibility in adjusting structural dynamic characteristics, and new possible solutions to the flutter instability problem of long-span bridges. Based on a multi-cable suspension bridge, this paper presents a particular insight into the dynamic characteristics which was contrast with double-cable suspension bridge. Furthermore, the influence of stiffness distribution and sag-span ratio of main cables on the dynamic characteristics was also studied. It is shown that due to the different contribution of the main cables, multi-cable suspension bridge has various torsional modes with similar vibration shapes of the stiffening girder, which is quite different from double-cable suspension bridge. Changes in stiffness distribution of main cables also have significant effects on the form of these torsional modes. On this basis, the flutter performance of multi-cable suspension bridge is studied by modality-driven method. The results indicate that the flutter critical wind speed increases with the increase of sag-span ratio and stiffness ratio of inner and outer main cables, and multi-cable suspension bridge can obtain better flutter performance than double-cable suspension bridge with appropriate stiffness distribution. The change of stiffness distribution and sag-span ratio may lead to the transition of flutter dominant mode.
期刊介绍：
The objective of the journal is to provide a means for the publication and interchange of information, on an international basis, on all those aspects of wind engineering that are included in the activities of the International Association for Wind Engineering http://www.iawe.org/. These are: social and economic impact of wind effects; wind characteristics and structure, local wind environments, wind loads and structural response, diffusion, pollutant dispersion and matter transport, wind effects on building heat loss and ventilation, wind effects on transport systems, aerodynamic aspects of wind energy generation, and codification of wind effects.
Papers on these subjects describing full-scale measurements, wind-tunnel simulation studies, computational or theoretical methods are published, as well as papers dealing with the development of techniques and apparatus for wind engineering experiments.
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