Static and Dynamic Behaviours of Three-Tower Suspension Bridges and the Structure Selection of the Mid-Tower

Abstract:

In order to discuss the mechanical behaviour differences between the two-tower and three-tower suspension bridges, based on the Taizhou Yangtze River Bridge, three dimensional space finite element models of two-tower, three-tower with concrete mid-tower and with steel mid-tower were constructed. Through the comprehensive analysis, main conclusions are got as follows: due to the mid-tower lack of effective restraint from side cable, compared with two-tower suspension bridges, three-tower suspension bridges have lower total stiffness and natural frequency, with larger deflection-to-span ratio of main girder. So, some factors such as anti-slipping safety factor between the main cable and saddle, deflection-to-span ratio of main girder and force in mid-tower, which are not important in two-tower design, become controlling ones in three-tower suspension bridges. These factors are related to anti-pushing rigidity of mid-tower, but in contradictory demanding for the rigidity of mid-tower. After comprehensive analysis, steel tower with shape of upside-down ‘Y’ meets all demands, and then, was selected as appropriate structure for the mid-tower.

• Periodical: Advanced Materials Research (Volumes 163-167)
• Pages: 2343-2349
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.163-167.2343
• Online since: December 2010
• Authors: Peng Liang, Xiang Nan Wu, Yue Xu
• Keywords: Anti-Slipping Safety Factor between the Main Cable and Saddle of the Mid-Tower, Bridge Engineering, Deflection-to-Span Ratio of Main Girder, Dynamic Behavior, Seismic Response, Static Behavior, Structure Selection of Mid-Tower, Three-Tower Suspension Bridge

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