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| Received:January 30, 2015 Revised:May 24, 2015 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx201603016 |
| KeyWord:suspension bridge main cable shape slender beam stiffness matrix nonlinear finite element program sag to span ratio |
| Author | Institution |
| 严琨 |
西南交通大学 土木工程学院, 成都 |
| 沈锐利 |
西南交通大学 土木工程学院, 成都 |
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| Abstract: |
| Refined analysis for main cable shape of suspension bridge needs to consider the impact of bending stiffness and original curve simultaneously.For the reason the main cable is discretized into the slender beam element with small deflection.Stiffness matrix of the slender beam element is derived,which contains the dead weight items,and takes into account the influence of axial force on the bending stiffness and the axial stiffness correction factor caused by the bending moment.Finite element program for shape calculation of main cable is compiled based on the slender beam element.An improved iteration method for solving nonlinear equilibrium geometry of the structure is adopted in the program,and the modification method for main cable shape at the saddle is also considered.Deformation of main cable under dead load is calculated by the program for two suspension bridge.The results show that there is a greater impact on the deformation of the bending stiffness of main cable in the mid span and in the vicinity of cable pylon.And the greater sag to span ratio,the greater deformation calculation error.Deformation calculation error of main cable caused by the bending stiffness will bring some problems,such as cutting length of hanger inaccurate,lofting coordinate of cable clamp inaccurate,bridge deck shape not up to the design requirements and uneven distribution of hanger axial force in the finished bridge state.These problems need to be taken seriously enough in the design and construction,especially for the self-anchored suspension bridge with a larger sag to span ratio. |
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