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Geometric nonlinear analysis of self-anchored cable-stayed suspension bridges
Wang Hui-Li1, Tan Yan-Bin, Qin Si-Feng
1Bridge Engineering Research Institute, Dalian University of Technology, Dalian 116085, China.
Thescientificworldjournal
|November 28, 2013
Summary
Geometric nonlinearity in self-anchored cable-stayed suspension bridges is analyzed. Second-order theory is suitable for 800m spans, with concrete shrinkage and creep significantly impacting performance.
Area of Science:
- Structural Engineering
- Civil Engineering
- Bridge Engineering
Background:
- Self-anchored cable-stayed suspension bridges are complex structures.
- Geometric nonlinearity significantly influences their behavior.
- Factors like concrete shrinkage, creep, rise-to-span ratio, and girder camber are critical.
Purpose of the Study:
- To investigate the geometric nonlinearity of self-anchored cable-stayed suspension bridges.
- To analyze the impact of concrete shrinkage and creep, rise-to-span ratio, and girder camber.
- To compare linear, second-order, and nonlinear theories for analyzing an 800m span bridge.
Main Methods:
- Analysis of an 800m span self-anchored cable-stayed suspension bridge.
- Application of linear theory, second-order theory, and nonlinear theory.
- Evaluation of moments and displacements under live load for various rise-to-span ratios and girder cambers.
Main Results:
- Second-order theory provides accurate analysis (error < 6%) for 800m span self-anchored cable-stayed suspension bridges.
- Concrete shrinkage and creep have a substantial effect on the structure.
- Increased rise-to-span ratio reduces axial forces in the main cable and girder.
- Girder camber enhances system stiffness.
Conclusions:
- Second-order theory is a viable and accurate method for analyzing large-span self-anchored cable-stayed suspension bridges.
- The influence of concrete material properties (shrinkage and creep) must be considered in design.
- Design parameters like rise-to-span ratio and girder camber can be optimized to improve structural performance and stiffness.
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