Impact of cross-tie design on the in-plane stiffness and local mode formation of cable networks on cable-stayed bridges
Impact of cross-tie design on the in-plane stiffness and local mode formation of cable networks on cable-stayed bridges
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DOI：
10.1016/j.jsv.2015.09.052
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发表时间：
2016-02
影响因子：
4.7
通讯作者：
J. Ahmad;Shaohong Cheng;F. Ghrib
中科院分区：
文献类型：
--
作者：
J. Ahmad;Shaohong Cheng;F. Ghrib
虽然斜拉桥形成的索网的力学机制尚未完全了解，但使用交叉系杆抑制不利的斜拉索振动在斜拉桥上越来越流行。在实际工程中，设计系杆或索网的主要任务是根据索网中主缆的特性选择系杆的安装位置、刚度和数量。为了更全面地了解如何选择这些设计参数，以实现更高的平面内网络刚度，同时最大限度地减少激发的局部模式的数量，它是必要的，以检查一般配置的索网络的动态行为。在目前的研究中，一个一般的电缆网络的分析模型，由多个主电缆互连的多行横向柔性枕木将开发。一个新的术语，定义为本地模式集群，将被引入到本地模式激励的严重性进行评估。将提出用于识别局部模式簇的存在的标准。将进行参数研究，以评估横拉杆安装位置、刚度和数量对网络模态响应的影响。从本研究中获得的结果将提供更深入的了解这些系统参数的选择，以实现增加网络面内刚度和最小化局部模式的激励的综合效益。
Suppressing unfavorable stay cable vibrations using cross-ties is becoming more popular on cable-stayed bridges though the mechanics of the formed cable network is yet fully understood. In practice, the main task in designing cross-ties or cable networks is to choose the cross-tie installation location, stiffness and number based on the main cable properties in the network. To have a more comprehensive picture of how to choose these design parameters to achieve higher in-plane network stiffness while minimizing the number of excited local modes, it is imperative to examine dynamic behavior of cable networks with general configurations. In the current study, an analytical model of a general cable network consisting of multiple main cables interconnected by multiple lines of transverse flexible cross-ties will be developed. A new term, defined as the local mode cluster, will be introduced to assess the severity of local mode excitation. Criteria for identifying the presence of local mode cluster will be proposed. A parametric study will be conducted to evaluate the impact of cross-tie installation location, stiffness and number on the network modal response. Results obtained from the present study will provide deeper insight into the selection of these system parameters to achieve the combined benefits of increasing network in-plane stiffness and minimizing the excitation of local modes.