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Impact of Cross-Tie Properties on the Modal Behavior of Cable Networks on Cable-Stayed Bridges.

Ahmad J, Cheng S, Ghrib F - ScientificWorldJournal (2015)

Bottom Line: While the effects of the former two on the network response have been investigated to some extent in the past, the impact of cross-tie damping has rarely been addressed.In addition, the damping property of main cables in the network will also be considered in the formulation.The proposed analytical model will be applied to networks with different configurations.

View Article: PubMed Central - PubMed

Affiliation: Department of Civil and Environmental Engineering, University of Windsor, 401 Sunset Avenue, Windsor, ON, Canada N9B 3P4.

ABSTRACT
Dynamic behaviour of cable networks is highly dependent on the installation location, stiffness, and damping of cross-ties. Thus, these are the important design parameters for a cable network. While the effects of the former two on the network response have been investigated to some extent in the past, the impact of cross-tie damping has rarely been addressed. To comprehend our knowledge of mechanics associated with cable networks, in the current study, an analytical model of a cable network will be proposed by taking into account both cross-tie stiffness and damping. In addition, the damping property of main cables in the network will also be considered in the formulation. This would allow exploring not only the effectiveness of a cross-tie design on enhancing the in-plane stiffness of a constituted cable network, but also its energy dissipation capacity. The proposed analytical model will be applied to networks with different configurations. The influence of cross-tie stiffness and damping on the modal response of various types of networks will be investigated by using the corresponding undamped rigid cross-tie network as a reference base. Results will provide valuable information on the selection of cross-tie properties to achieve more effective cable vibration control.

No MeSH data available.


Related in: MedlinePlus

First ten modes of an asymmetric DMT two-cable network with a damped flexible cross-tie (Kc = 30.54 kN/m, Cc = 1.0 kN·s/m) at ε = 1/3.
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fig5: First ten modes of an asymmetric DMT two-cable network with a damped flexible cross-tie (Kc = 30.54 kN/m, Cc = 1.0 kN·s/m) at ε = 1/3.

Mentions: The same two main cables in the symmetric DMT cable network of Section 3.2 are rearranged in this section such that the left and the right offsets of the neighbouring cable with respect to the target cable (Figure 1) are, respectively, 3 m and 9 m. In addition, the cross-tie is relocated to one-third span of the target cable from its left support; that is, ε = 1/3. These changes in the layout lead to an asymmetric DMT cable network. Table 4 lists the modal properties of the first ten network modes obtained from the proposed analytical model and numerical simulation. A good agreement between the two sets can be clearly seen. In addition, the modal analysis results of a corresponding rigid cross-tie network are also given in the same table for the convenience of comparison. The mode shapes of these ten modes are depicted in Figure 5.


Impact of Cross-Tie Properties on the Modal Behavior of Cable Networks on Cable-Stayed Bridges.

Ahmad J, Cheng S, Ghrib F - ScientificWorldJournal (2015)

First ten modes of an asymmetric DMT two-cable network with a damped flexible cross-tie (Kc = 30.54 kN/m, Cc = 1.0 kN·s/m) at ε = 1/3.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4488171&req=5

fig5: First ten modes of an asymmetric DMT two-cable network with a damped flexible cross-tie (Kc = 30.54 kN/m, Cc = 1.0 kN·s/m) at ε = 1/3.
Mentions: The same two main cables in the symmetric DMT cable network of Section 3.2 are rearranged in this section such that the left and the right offsets of the neighbouring cable with respect to the target cable (Figure 1) are, respectively, 3 m and 9 m. In addition, the cross-tie is relocated to one-third span of the target cable from its left support; that is, ε = 1/3. These changes in the layout lead to an asymmetric DMT cable network. Table 4 lists the modal properties of the first ten network modes obtained from the proposed analytical model and numerical simulation. A good agreement between the two sets can be clearly seen. In addition, the modal analysis results of a corresponding rigid cross-tie network are also given in the same table for the convenience of comparison. The mode shapes of these ten modes are depicted in Figure 5.

Bottom Line: While the effects of the former two on the network response have been investigated to some extent in the past, the impact of cross-tie damping has rarely been addressed.In addition, the damping property of main cables in the network will also be considered in the formulation.The proposed analytical model will be applied to networks with different configurations.

View Article: PubMed Central - PubMed

Affiliation: Department of Civil and Environmental Engineering, University of Windsor, 401 Sunset Avenue, Windsor, ON, Canada N9B 3P4.

ABSTRACT
Dynamic behaviour of cable networks is highly dependent on the installation location, stiffness, and damping of cross-ties. Thus, these are the important design parameters for a cable network. While the effects of the former two on the network response have been investigated to some extent in the past, the impact of cross-tie damping has rarely been addressed. To comprehend our knowledge of mechanics associated with cable networks, in the current study, an analytical model of a cable network will be proposed by taking into account both cross-tie stiffness and damping. In addition, the damping property of main cables in the network will also be considered in the formulation. This would allow exploring not only the effectiveness of a cross-tie design on enhancing the in-plane stiffness of a constituted cable network, but also its energy dissipation capacity. The proposed analytical model will be applied to networks with different configurations. The influence of cross-tie stiffness and damping on the modal response of various types of networks will be investigated by using the corresponding undamped rigid cross-tie network as a reference base. Results will provide valuable information on the selection of cross-tie properties to achieve more effective cable vibration control.

No MeSH data available.


Related in: MedlinePlus