Investigation of Influence Factors of Wind-Induced Buffeting Response of a Six-Tower Cable-Stayed Bridge

Zhi-Qiang Zhang,Fang-Fang Geng,You-Liang Ding

doi:10.1155/2016/6274985

Zhi-Qiang Zhang, Fang-Fang Geng + Show 1 more

Open Access

https://doi.org/10.1155/2016/6274985

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Abstract

This paper presents an investigation of the wind-induced buffeting responses of the Jiashao Bridge, the longest multispan cable-stayed bridge in the world. A three-dimensional finite element model for the Jiashao Bridge is established using the commercial software package ANSYS and a 3D fluctuating wind field is simulated for both bridge deck and towers. A time-domain procedure for analyzing buffeting responses of the bridge is implemented in ANSYS with the aeroelastic effect included. The characteristics of buffeting responses of the six-tower cable-stayed bridge are studied in some detail, focusing on the effects including the difference in the longitudinal stiffness between the side towers and central towers, partially longitudinal constraints between the bridge deck and part of bridge towers, self-excited aerodynamic forces, and the rigid hinge installed in the middle of the bridge deck. The analytical results can provide valuable references for wind-resistant design of multispan cable-stayed bridges in the future.

Highlights

For long-span cable-stayed bridges, the multispan cablestayed bridges with three or more towers have been a recent design trend [1, 2]
The specific objectives of this study are to (i) perform the time-domain buffeting responses of the multispan cable-stayed bridge implemented in ANSYS with the aeroelastic effect included; (ii) investigate the distribution characteristics of buffeting responses of the bridge deck and bridge towers; and (iii) investigate the effects including the difference in the longitudinal stiffness between the side towers and central towers, partially longitudinal constraints between the bridge deck and part of bridge towers, selfexcited aerodynamic forces, and the rigid hinge installed in the middle of the bridge deck on the buffeting responses of the multispan cable-stayed bridge
In order to overcome the problem of large temperature-induced longitudinal deformation in the bridge deck, two important structural measures are applied in the design of Jiashao Bridge as shown in Figure 1(b): (i) The “drawer-type” rigid hinge shown in Figure 2 is installed in the midspan of the bridge deck

Summary

Introduction

For long-span cable-stayed bridges, the multispan cablestayed bridges with three or more towers have been a recent design trend [1, 2]. Investigations of time-domain buffeting analysis have been done by several researchers in recent years [5, 8–13] These investigations conducted into the application of time-domain buffeting analysis of long-span bridges provide valuable references for the wind-induced buffeting responses of the multispan cablestayed bridges in the present study. The specific objectives of this study are to (i) perform the time-domain buffeting responses of the multispan cable-stayed bridge implemented in ANSYS with the aeroelastic effect included; (ii) investigate the distribution characteristics of buffeting responses of the bridge deck and bridge towers; and (iii) investigate the effects including the difference in the longitudinal stiffness between the side towers and central towers, partially longitudinal constraints between the bridge deck and part of bridge towers, selfexcited aerodynamic forces, and the rigid hinge installed in the middle of the bridge deck on the buffeting responses of the multispan cable-stayed bridge

Bridge Description

Dynamic Finite Element Model

Nonlinear Buffeting Response of the Bridge

Wind-Induced Buffeting Response of the Bridge

Discussions

Conclusions