基于UHPC的超大跨径桥梁优化设计

Optimal Design of Ultra-long Span Bridge Based on UHPC

为了解决常规混凝土下大跨径桥梁出现的箱梁易开裂,主跨径难以突破300 m等问题,将超高性能混凝土(ultra-high performance concrete,UHPC)引用至超大跨径的桥梁设计当中,形成了一种集薄壁结构、密集横隔板箱梁于一体的新型连续梁结构,并对横隔板参数和跨径比进行优化,确定最佳横隔板间隔为4 m,跨径比为0.6。将UHPC箱体桥梁设计方案与某实体桥梁进行对比分析,发现UHPC桥梁具有可持续性强、使用寿命长等优点,为超大跨径连续箱体桥梁设计提供了一个新的方法。

In order to solve the problems in long span bridge of conventional concrete, such as easilycracking of box girder, limited span （under 300 m）, Ultra-high Performance Concrete （UHPC） has beenintroduced to the design of ultra-long span bridge. A new type structure of continuous box girder containthin-wall structure and dense diaphragm plates has been design. Obtain the optimal distance is 4m ofdense diaphragm plates and optimal span ratio is 0.6 through performance analysis and optimizationdesign. Research finding the UHPC bridge has the advantages of strong sustainability, long service lifethrough contrastive analysis of UHPC bridge design scheme and entity arch bridge. The design of UHPCbridge provide a new method for ultra-long continuous box girder bridge.