大温差地区高速铁路钢桥面新型铺装应用研究

Study on Application of UHPC Steel Bridge Deck Pavement in Highspeed Railways in Areas with Large Temperature Difference

结合包银高速铁路乌海黄河桥主桥工程,从温度力影响、受力性能、对桥梁刚度和轨道平顺性的影响、耐久性和经济性方面,对大温差地区UHPC新型钢桥面铺装的应用效果进行了研究。结果表明:(1)在大温差地区,钢混组合桥面铺装层、剪力钉的温度工况应力分别为最不利组合应力最大值的36%和11%以上;(2)UHPC新型钢桥面铺装具有良好的受力性能,设计方案可满足结构受力需求;(3)该新型钢桥面铺装可有效提升桥梁整体刚度和轨道平顺性,主跨活载挠度和轨道不平顺值分别减小3.8%和13.1%以上;(4)该新型钢桥面铺装能够有效提升桥梁钢桥面的耐久性,且具有良好的经济性;(5)UHPC新型钢桥面铺装可在大温差地区高速铁路钢桥建设中进一步推广应用。

Taking the main bridge of the Wuhai Yellow River Bridge of Baotou-Yinchuan High-speed Railway as an example,this study explored the application of UHPC(Ultra-High Performance Concrete)as a new type of steel bridge deck pavement in areas with large temperature difference,in terms of the influences of temperature forces,structural performance,effects on bridge stiffness and rail smoothness,as well as durability and economy.The results show that:(1)In areas with large temperature difference,the pavement layer of the steel-concrete composite bridge and the temperature condition stress of the shear connectors are at least 36%and 11%,respectively,of the maximum value of the most unfavorable combined stress.(2)The UHPC steel bridge deck pavement shows good structural performance and the design scheme can meet the structural stress requirements.(3)The UHPC steel bridge deck pavement can effectively improve the overall stiffness of the bridge and the smoothness of the track,with the main span live load deflection and track irregularity values decreasing by more than 3.8%and 13.1%,respectively.(4)The UHPC steel bridge deck pavement can effectively enhance the durability of the bridge’s steel deck and offers good economic advantages.(5)The UHPC steel bridge deck pavement can be further promoted and applied in the construction of high-speed railway steel bridges in areas with large temperature difference.