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Abstract

Bilateral box steel main girders are widely employed in large-span double-plane cable-stayed bridges. These bridges are characterized by low frequency, small damping, and relatively light mass, and their wind resistance stability is a key problem to be solved in bridge construction. By taking the Pingnan super major cable-stayed bridge with a main span of 636 m on Pingrong Expressway under construction as the research project, this paper built a finite element spatial model of the bridge and analyzed the structural modal characteristics. Meanwhile, it carried out the main girder segmental model of elastically suspended vortex vibration and chatter vibration wind tunnel tests to study the effect of the cantilevered sidewalk on the wind resistance performance of the bilateral box main girder. The test results show that the bilateral box main girder of the Pingnan super major bridge has sound vortex vibration performance, with no vortex vibration phenomenon observed in the test. Additionally, cantilevered sidewalks improve the chatter stability of the bridge, conducive to wind resistance of the bridge.

Publication Date

9-14-2023

DOI

10.14048/j.issn.1671-2579.2023.04.021

First Page

131

Last Page

136

Submission Date

March 2025

Reference

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