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On the determination of natural frequencies and mode shapes of cable-stayed bridges

机译:关于斜拉桥固有频率和模态形状的确定

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摘要

An accurate analysis of the natural frequencies and mode shapes of a cable-stayed bridge is fundamental to the solution of its dynamic responses due to seismic, wind and traffic loads. In most previous studies, the stay cables have been modelled as single truss elements in conventional finite element analysis. This method is simple but it is inadequate for the accurate dynamic analysis of a cable-stayed bridge because it essentially precludes the transverse cable vibrations. This paper presents a comprehensive study of various modelling schemes for the dynamic analysis of cable-stayed bridges. The modelling schemes studied include the finite element method and the dynamic stiffness method. Both the mesh options of modelling each stay cable as a single truss element with an equivalent modulus and modelling each stay cable by a number of cable elements with the original modulus are studied. Their capability to account for transverse cable vibrations in the overall dynamic analysis as well as their accuracy and efficiency are investigated. © 2001 Elsevier Science Inc. All rights reserved.
机译:斜拉桥的固有频率和振型的准确分析对于解决因地震,风和交通荷载引起的动态响应至关重要。在大多数以前的研究中,在传统的有限元分析中,斜拉索已被建模为单个桁架单元。这种方法很简单,但由于它基本上可以避免横向电缆振动,因此不足以对斜拉桥进行精确的动力分析。本文对斜拉桥的动力分析进行了各种建模方案的综合研究。研究的建模方案包括有限元法和动态刚度法。研究了将每个斜拉索建模为具有等效模量的单个桁架单元和通过使用多个具有原始模量的索单元建模每个斜拉索的网格选项。研究了它们在整体动态分析中考虑横向电缆振动的能力以及其准确性和效率。 ©2001 Elsevier Science Inc.保留所有权利。

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