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Volume 55 Issue 2
Mar.  2020
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Article Contents
Journal of Southwest Jiaotong University  > 2020  >  55(2): 238-246.
ZHANG Qinghua, ZHANG Ying, CHENG Zhenyu, KANG Jiping, HE Jing. Static Behavior and Key Influencing Factors of Double-Cable Suspension Bridge[J]. Journal of Southwest Jiaotong University, 2020, 55(2): 238-246. doi: 10.3969/j.issn.0258-2724.20170908
Citation: ZHANG Qinghua, ZHANG Ying, CHENG Zhenyu, KANG Jiping, HE Jing. Static Behavior and Key Influencing Factors of Double-Cable Suspension Bridge[J]. Journal of Southwest Jiaotong University, 2020, 55(2): 238-246. doi: 10.3969/j.issn.0258-2724.20170908
shu

Static Behavior and Key Influencing Factors of Double-Cable Suspension Bridge

doi: 10.3969/j.issn.0258-2724.20170908
  • Received Date: 16 Dec 2017
  • Rev Recd Date: 06 Aug 2018
    • Available Online: 30 Oct 2019
  • Publish Date: 01 Apr 2020
    Abstract
  • Double-cable suspension bridge system is one of structural systems suitable for long-span multi-tower suspension bridges. In order to study the mechanical properties of the bridge system, the finite element method is used to analyze its static behavior and the effect of key design parameters. First, the main design parameters of a double-cable multi-tower suspension bridge are determined according to a typical single-cable multi-tower suspension bridge, and finite element models of the two types of suspension bridges are established. Based on the models, the vertical stiffness values of the two suspension bridges are then compared. Finally, the influence of key design parameters such as the ratio of side to main span, stiffness of middle tower, dead load distribution ratio, and rise-span ratio on the total unbalanced force of the main cable, vertical displacement at top tower, and the maximum mid-span deflections of the main beam are studied. The results show that compared with the single-cable bridge, the double-cable bridge can effectively improve the vertical stiffness of the bridge system and greatly reduce the total unbalanced force of the main cable. Reducing the ratio of side to main span has little effect on the vertical stiffness of the double-cable bridge and the total unbalanced force of the main cable. On the contrary, increasing the middle tower stiffness can improve the vertical stiffness of the double-cable bridge significantly, but simultaneously resulting in a large increase in the unbalanced force of the main cable. When the dead load distribution ratio ranges from 1.0 to 2.0, the displacement at middle tower top and mid-span deflections of main beams are smaller in the double-cable bridge. In addition, decreasing the rise-span ratio of top cable or increasing the rise-span ratio of bottom cable can significantly improve the vertical stiffness of the double cable bridge, and thus effectively reduce the maximum mid-span deflections of the main beam and the displacement at the middle tower top.

     

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