Wind-induced collision of hangers in a network arch bridge: Reliability and cost-benefit analysis

Abstract

The lateral distance between crossing hangers of network arch bridges is typically relatively small. Under strong wind conditions, the unsynchronized vibrations of the hangers may lead to potential collisions, which can significantly degrade the coating of the hangers and reduce their service life. In this paper, an analytical procedure is developed to assess the potential for collisions in network arch bridges. First, a finite element model considering the local vibration characteristics of the hangers is built and the stochastic wind field of the bridge site is formed. Buffeting forces are applied to various components of the bridge, and dynamic response analysis is conducted to determine the relative displacement between hangers. Parametric analysis is carried out on the parameters such as wind speed, terrain type, and structural damping ratio. And collision reliability indicators under different conditions are obtained through classification discussion or determination of probability density functions. Furthermore, the application and cost-benefit of anti-collision measures are discussed. Results show that using anti-collision measures will bring positive benefits. The proposed design procedure can be widely used in engineering practice.

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