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- Title
大跨度铁路斜拉桥索力快速识别方法研究.
- Authors
曹阳梅
- Abstract
In order to deal with the problems of limited skylight time and harsh loading conditions of railway bridges, it is very important to realize high precision identification of cable force of long span railway stayed-cable bridge using common monitoring devices. A fast cable force identification method considering the bending stiffness of the cable is proposed, which can not only improve the identification accuracy of cable force, but also simplifies the steps in cable force identification during operation. The method is not limited by the boundary conditions of the cable and the actual operating state of the railway bridge. Results show that the bending stiffness has great influence on identification accuracy of cable force, which can be improved by considering the actual bending stiffness of cables. Based on the field acceleration data of the cable, the functional relationship between frequency, cable force and bending stiffness is established based on simply supported beam model. The continuous variation diagram of bending stiffness and cable force is plotted by numerical methods, and the unique bending stiffness and cable force value can be further determined by the intersection line of multi-order modes. The effectiveness of the method is verified by a long-span railway cable-stayed bridge. Results show that: (1) The relative error of the cable force identified by this method can be reduced by 5. 22%, and the absolute cable force value can reach 254. 45 kN; ( 2) In practical application, the identification results are interfered by low-order frequencies, so it is advisable to use high-order frequencies for identification, and it is recommended to use the measured frequencies of order 5 and above.
- Publication
Railway Standard Design, 2024, Vol 68, Issue 4, p116
- ISSN
1004-2954
- Publication type
Article
- DOI
10.13238/j.issn.1004-2954.202209260008