Study on Static Influence of Central Buckle of Three-pylon Two-span Suspension Bridge
The central buckle is often used to reduce the longitudinal relative displacement between the cable and beam of long-span suspension bridges.For the three-pylon two-span ground anchor suspension bridge,the central buckle has a greater impact on the structure stress.In order to reveal the static impact and internal mechanism of the central buckle on the three-pylon two-span ground anchor suspension bridge,based on the Changjiang River Highway Bridge in Taizhou,the effects of setting the different central buckles on the stress of the middle pylon,the main cable and the stiffening girder are studied through the computational analysis and comparison of multiple finite element models.The study shows that the double central buckle structure with horizontal longitudinal cables of the three-pylon two-span ground anchor suspension bridge makes the cable,beam and middle pylon form a direct force transmission channel,which reduces the live load shearing force born by the upper pylon of the middle pylon,and greatly improves the internal force displacement of the middle pylon,the anti-slip safety of the main cable at the middle pylon and the bending moment of the stiffener girder.
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