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Structural Engineering and Mechanics Volume 73, Number 6, March25 2020 , pages 641-649 DOI: https://doi.org/10.12989/sem.2020.73.6.641 |
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Study on midtower longitudinal stiffness of three-tower four-span suspension bridges with steel truss girders |
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Jin Cheng, Hang Xu and Mingsai Xu
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| Abstract | ||
| The determination of midtower longitudinal stiffness has become an essential component in the preliminary design of multi-tower suspension bridges. For a specific multi-tower suspension bridge, the midtower longitudinal stiffness must be controlled within a certain range to meet the requirements of sliding resistance coefficient and deflection-to-span ratio. This study presents a numerical method to divide different types of midtower and determine rational range of longitudinal stiffness for rigid midtower. In this method, influence curves of midtower longitudinal stiffness on sliding resistance coefficient and maximum vertical deflection-to-span ratio are first obtained from the finite element analysis. Then, different types of midtower are divided based on the regression analysis of influence curves. Finally, rational range for longitudinal stiffness of rigid midtower is derived. The Oujiang River North Estuary Bridge which is a three-tower four-span suspension bridge with two main spans of 800m under construction in China is selected as the subject of this study. This will be the first three-tower four-span suspension bridge with steel truss girders and concrete midtower in the world. The proposed method provides an effective and feasible tool for engineers to design midtower of multi-tower suspension bridges. | ||
| Key Words | ||
| three-tower suspension bridges; midtower; longitudinal stiffness; sliding resistance; deflection-to-span ratio | ||
| Address | ||
| Jin Cheng: State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai, China Jin Cheng, Hang Xu and Mingsai Xu: Department of Bridge Engineering, Tongji University, Shanghai, China | ||