OSD疲劳问题受UHPC的影响及力学成因分析研究进展

Effect of UHPC on OSD Fatigue Problem and Research Progress of the Mechanical Causes Analysis

为提高正交异性钢桥面板(OSD)的力学性能,基于国内外多位学者的数值模拟分析、实桥监测、静动力学试验研究,总结了近年来围绕超高性能混凝土(UHPC)材料桥面铺装对OSD疲劳问题的影响、OSD疲劳问题的力学成因相关内容的研究进展。研究发现:1)相较裸板或其他柔性铺装,UHPC对纵肋-顶板连接处疲劳问题具有较明显的提升效果,对纵肋对接焊缝、横隔板-纵肋连接处的疲劳问题有更好的作用,但效果有限;2)UHPC与OSD的连接方式、UHPC路面状况也在一定程度上影响OSD疲劳性能;3)从第二、第三体系力学效应出发分析得知,顶板与纵肋相交处顶板上的疲劳部位主要受第三体系效应影响,纵肋与横隔板相交处纵肋上的疲劳部位受第二体系效应影响更大,不同结构参数对不同疲劳部位应力水平及抗疲劳性能有不同影响。据此,可对UHPC的效果给出解释,并为解决OSD疲劳问题提供指导。

In order to improve the mechanical properties of Orthotropic Steel Deck(OSD),this paper summarizes the research progress on the influence of ultra-high performance concrete(UHPC)bridge deck pavement on OSD fatigue problem and the mechanical causes of OSD fatigue problem in recent years,based on the numerical simulation analysis,real bridge monitoring and static and dynamic test research of many scholars at home and abroad.The analysis shows that:1)Compared to bare plates or other flexible paving,UHPC has more obvious effect in improving the fatigue problem of the rib-to-deck joint,and it has a better effect on the fatigue problem of the longitudinal rib butt welding joint and the rib-to-diaphragm welded joint.However,these effects are still too limited;2)To some extent,the connection mode between UHPC and OSD,and the UHPC pavement condition also affect the fatigue performance of OSD;3)From the analysis of the mechanical effects of the second and third systems,it is found that the fatigue details of deck which at the rib-to-deck joint are mainly affected by the third system effect,and the fatigue details of rib at the rib-to-diaphragm joint are more affected by the second system effect.Different structural parameters have different effects on the stress level and fatigue resistance performance of different fatigue details,which can explain the effect of UHPC and provide guidance for solving OSD fatigue issues.