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ANALYSIS OF THE DYNAMIC CHARACTERISTICS OF BOX GIRDER BRIDGES

Aizaz Kashif, J. L. Humar

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Abstract

An important consideration in the design of bridges is the dynamic response of the structure to moving vehicle load. The paper describes a study that used the finite element method to analyze the dynamic response of simple span box girder bridges. Presented is the formulation of the equations of motion, as well as analytical studies that are carried out using a vehicle that is idealized as a two axle, four wheel sprung mass system. Additional studies were conducted to obtain the characteristic frequencies and mode shapes of the system to investigate the influence of parameters such as aspect ratio, number of diaphragms, and number of bracing on the vibration characteristics of the bridge.

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What this paper is about

An important consideration in the design of bridges is the dynamic response of the structure to moving vehicle load. The paper describes a study that used the finite element method to analyze the dynamic response of simple span box girder bridges. Presented is the formulation of the equations of motion, as well as analytical studies that are carried out using a vehicle that is idealized as a two axle, four wheel sprung mass system. Additional studies were conducted to obtain the characteristic frequencies and mode shapes of the system to investigate the influence of parameters such as aspect ratio, number of diaphragms, and number of bracing on the vibration characteristics of the bridge.

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Available abstract

An important consideration in the design of bridges is the dynamic response of the structure to moving vehicle load. The paper describes a study that used the finite element method to analyze the dynamic response of simple span box girder bridges. Presented is the formulation of the equations of motion, as well as analytical studies that are carried out using a vehicle that is idealized as a two axle, four wheel sprung mass system. Additional studies were conducted to obtain the characteristic frequencies and mode shapes of the system to investigate the influence of parameters such as aspect ratio, number of diaphragms, and number of bracing on the vibration characteristics of the bridge.

Key concepts: Structural engineering, Bracing, Finite element method, Box girder, Vibration, Engineering, Axle, Bridge (graph theory)

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