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Influence Factors Analysis on the Modal Characteristics of Irregularly-Shaped Bridges Based on a Free-Interface Mode Synthesis Algorithm

College of Transportation, Jilin University, Changchun 130025, China
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Academic Editor: Stefano Mariani
Algorithms 2017, 10(2), 62; https://doi.org/10.3390/a10020062
Received: 24 December 2016 / Revised: 23 May 2017 / Accepted: 24 May 2017 / Published: 28 May 2017
In order to relieve traffic congestion, irregularly-shaped bridges have been widely used in urban overpasses. However, the analysis on modal characteristics of irregularly-shaped bridges is not exhaustive, and the effect of design parameters on modal characteristics will be deeply investigated in future studies. In this paper, a novel strategy based on a free-interface mode synthesis algorithm is proposed to evaluate the parameters’ effect on the modal characteristics of irregularly-shaped bridges. First, a complicated, irregularly-shaped bridge is divided into several substructures based on its properties. Then, the modal characteristics of the overall structure can be obtained, only by a few low-order modal parameters of each substructure, using a free-interface mode synthesis method. A numerical model of a typical irregularly-shaped bridge is employed to verify the effectiveness of the proposed strategy. Simulation results reveal that the free-interface mode synthesis method possesses favorable calculation accuracy for analyzing the modal characteristics of irregularly-shaped bridges. The effect of design parameters such as ramp curve radius, diaphragm beam stiffness, cross-section feature, and bearing conditions on the modal characteristics of an irregularly-shaped bridge is evaluated in detail. Analysis results can provide references for further research into and the design of irregularly-shaped bridges. View Full-Text
Keywords: irregularly-shaped bridges; dynamic substructure; free interface modal synthesis method; design parameters; modal characteristics irregularly-shaped bridges; dynamic substructure; free interface modal synthesis method; design parameters; modal characteristics
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Liu, H.; Zhang, M.; Wang, X.; Tian, S.; Jiao, Y. Influence Factors Analysis on the Modal Characteristics of Irregularly-Shaped Bridges Based on a Free-Interface Mode Synthesis Algorithm. Algorithms 2017, 10, 62.

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Algorithms, EISSN 1999-4893, Published by MDPI AG
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