Buffeting analysis and control technology research of a super-long-span multi-tower sea-crossing cable-stayed bridge during construction

XIAN Rong1, LI Qinfeng2, MA Cunming3

Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (14) : 57-65.

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PDF(2159 KB)
Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (14) : 57-65.

Buffeting analysis and control technology research of a super-long-span multi-tower sea-crossing cable-stayed bridge during construction

  • XIAN Rong1,LI Qinfeng2,MA Cunming3
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Abstract

Compared to the completed bridge state, the super-long-span multi-tower sea-crossing cable-stayed bridge has the characteristics of low stiffness, low vibration frequency, and low damping ratio during the cantilever construction stage. It is easy to generate significant buffeting response under the high design wind speed in the coastal area. Accurate calculation of buffeting response during construction is beneficial to improve the safety of bridge construction. In order to realize the refined calculation of bridge buffeting, taking Huangmaohai Sea-crossing Bridge as the engineering background, the three-dimensional admittance function of the twin-box is considered into the buffeting frequency domain calculation method. The wind tunnel test model of the maximum double cantilever construction state verifies that this calculation method has higher accuracy compared to traditional steady-state assumptions and Sears functions. Then, based on this calculation method, the development law of buffeting response of the super-long-span multi-tower sea-crossing cable-stayed bridge during construction is explored: The vertical and lateral buffeting displacement extreme value at the cantilever end is not sensitive to the length of the construction cantilever end within the range of 0-200m cantilever, while the vertical and lateral buffeting displacement extreme value is very sensitive to the length of the cantilever end once the cantilever length exceeds 200m, showing exponential growth, and the maximum vertical buffeting displacement extreme value can reach 4.9m; The torsional buffeting displacement extreme value at the cantilever end is basically linear with the length of the cantilever end. The buffeting frequency response function is analyzed, and the concept of preliminary design of temporary pier arrangement position by modal analysis is proposed. The refined calculation method of buffeting was used to calculate the buffeting response of bridges under 9 temporary pier arrangements, and wind tunnel tests were conducted on the recommended scheme. The feasibility of this concept was verified through both calculations and experiments. The results show that the arrangement of temporary piers can reduce the vertical buffeting displacement extreme value of the cantilever end by 75%; It is necessary to comprehensively consider that the buffeting displacement extreme value of buffeting at the cantilever end increases with the increase of the span during the cantilever construction process, and the temporary pier is most reasonable to be arranged at 2/3 of the maximum cantilever length from the bridge tower.

Key words

Bridge engineering / Calculation of buffeting frequency domain / Wind tunnel test / Super-long-span sea-crossing cable-stayed bridge / Construction period / Temporary pier

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XIAN Rong1, LI Qinfeng2, MA Cunming3. Buffeting analysis and control technology research of a super-long-span multi-tower sea-crossing cable-stayed bridge during construction[J]. Journal of Vibration and Shock, 2024, 43(14): 57-65

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