Buffeting Responses of Single-Tower Cable-Stayed Bridge with Rigid Frame System During Construction

TANG Yu; HU Pan; JIA Hongyu; ZHENG Shixiong; ZHANG Gang

doi:10.3969/j.issn.0258-2724.20190848

Volume 56 Issue 3

Jun. 2021

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Journal of Southwest Jiaotong University > 2021 > 56(3): 485-492.

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TANG Yu, HU Pan, JIA Hongyu, ZHENG Shixiong, ZHANG Gang. Buffeting Responses of Single-Tower Cable-Stayed Bridge with Rigid Frame System During Construction[J]. Journal of Southwest Jiaotong University, 2021, 56(3): 485-492. doi: 10.3969/j.issn.0258-2724.20190848

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Buffeting Responses of Single-Tower Cable-Stayed Bridge with Rigid Frame System During Construction

doi: 10.3969/j.issn.0258-2724.20190848

Received Date: 03 Sep 2019
Rev Recd Date: 19 Nov 2019

Available Online: 06 Dec 2019

Publish Date: 15 Jun 2021

Abstract

Abstract

In order to estimate bridge buffeting responses more accurately, taking a large cantilever steel box composite girder of a single-tower cable-stayed bridge with rigid frame system under construction as the research object, a comparative study is made to investigate the differences in bridge dynamic characteristics caused by different modeling methods for tower-girder nodal rigid zone in finite element models. The two-dimensional incompressible unsteady Reynolds average Navier-Stocks (URANS) simulation method is used to identify aerodynamic admittances and static coefficients of the girder section, which consists of a steel box girder and large lateral cantilever arms. In addition, the quasi-steady buffeting theory of Davenport is carried out in ANSYS to analyze bridge responses in time domain, and the calculated buffeting responses are compared with those of the wind tunnel test of aeroelastic model. Results show that the structural dynamic characteristics and buffeting responses of the single-tower cable-stayed bridge with the maximum double cantilever in construction state are greatly affected by the finite element modeling method for the tower-girder binding zone. The maximum difference between structural fundamental frequencies reaches 21.3%, which deserves attention in similar dynamic analysis. The identified aerodynamic admittance of girder shows its dependence on parameters of incoming wind field, and should be utilized in a rational way. The calculated values of buffeting responses are found to be greater than that of the wind tunnel test of the aeroelastic model, and thus are conservative for structural design.
- single-tower cable-stayed bridge,
- construction stage,
- buffeting response,
- nodal rigid zone,
- aerodynamic admittance,
- wind tunnel test of aeroelastic model

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