A wind-static stability analysis method for parallel double-width bridges

Abstract

The invention discloses a static wind stability analysis method of a parallel double-width bridge. In computational fluid dynamics calculation or wind tunnel test, two main girder sections of the upstream and downstream bridges are simultaneously included in the model, and four parameters (the effective The wind attack angle α, the effective wind attack angle α' of the downstream main girder, the center distance d of the two main girders and the height difference h between the two main girders) are used to obtain the three-component force coefficients of the upstream main girder and the downstream main girder under different parameter combinations. At the same time, establish the spatial bar system finite element model of the upstream and downstream bridges, and iteratively calculate the four parameters, including the torsion angle θ of the upstream main girder, the torsion angle θ' of the downstream main girder, the distance between the centers of the two main girders d and the height difference h between the two main girders. Wind-still stability of upstream and downstream bridges. The present invention can consider the interference effect of the upstream and downstream girders, realize the refined analysis of the static aerodynamic stability of the parallel double-width bridge, and more accurately obtain the critical wind speed of the static aerodynamic instability of the upstream and downstream bridges, as well as the internal force and displacement at various wind speeds.

Description

technical field [0001] The invention belongs to the field of wind-resistant design and research of bridges, in particular to a wind-static stability analysis method for parallel double-width bridges. Background technique [0002] With the increasing traffic volume, bridges must have wider decks and more lanes to meet the traffic demand. In order to avoid the structural stress (excessive transverse bending moment of the main girder, distortion and shear lag, etc.) and aesthetic problems caused by the bridge deck being too wide, parallel double-width bridges are often used in actual projects. Parallel double-width bridges can be divided into two categories: the first type is a parallel double-width bridge newly built at the same time, and the second type is to expand a similar bridge near an existing bridge to form a parallel double-width bridge. In recent years, parallel double-width bridges have been increasingly designed and applied due to their greater traffic capacity, s...

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Problems solved by technology

[0006] Purpose of the invention: To provide an analysis method for the aerostatic stability of parallel double-width bridges in view of the fact that there is no aerostatic stability analysis specifically for parallel double-width bridges in the prior art, resulting in aerostatic instability that endangers bridge safety

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