超大跨径超高性能混凝土连续梁桥优化设计研究

Research on Optimal Design of Ultra Large Span and Ultra High Performance Concrete Continuous Beam Bridges

为改善超大跨径超高性能混凝土连续梁桥的受力状态,提升整体结构的稳定性,对桥梁整体设计方案进行优化。根据数值模拟分析结果,对跨中梁高、支点梁高、支点底板厚度等设计参数进行调整,优化桥梁设计方案。对优化后桥梁的结构受力状态和徐变下挠进行数值模拟分析,结果表明优化后桥梁结构受力状态良好、长期挠度较小,桥梁整体结构受力和变形均得到有效改善。

In order to improve the stress state of ultra large span and ultra high performance concrete continuous beam bridges and enhance the overall structural stability,the overall design scheme of the bridge is optimized.Based on the numerical simulation analysis results,the design parameters such as midspan beam height,fulcrum beam height,and fulcrum bottom plate thickness and so on are adjusted to optimize the bridge design scheme.The numerical simulation analysis is made on the stress state and creep deflection of the optimized bridge structure,and it is found that the optimized bridge structure has good stress state and small long-term deflection.The overall stress and deformation of the bridge structure are effectively improved.