新型大纵肋正交异性组合桥面板力学性能研究

发布时间：2018-02-01 12:50

本文关键词： 正交异性钢桥面板超高性能混凝土大纵肋静力性能疲劳性能有限元法应力幅　出处：《桥梁建设》2017年03期 　论文类型：期刊论文

【摘要】：为了解新型大纵肋钢-超高性能混凝土(UHPC)正交异性组合桥面板对传统正交异性钢桥面板的受力性能的改善效果,以港珠澳大桥深水区非通航孔6×110m连续钢箱梁桥为背景,建立全桥有限元模型,对2种桥面方案的静力性能进行对比,建立节段有限元模型,对比2种桥面方案U肋与顶板连接焊缝处的疲劳性能,并分析U肋开口宽度和UHPC结构层厚度对大纵肋钢-UHPC正交异性组合桥面板疲劳性能的影响。结果表明:2种桥面方案下钢箱梁控制点的位移和应力相差不大,所提出的大纵肋钢-UHPC正交异性组合桥面板在中等跨度连续梁桥中具有较好的适用性;大纵肋钢-UHPC正交异性组合桥面板的疲劳性能显著优于传统正交异性钢桥面板;增大U肋开口宽度会导致U肋与顶板连接焊缝应力幅增加,增加UHPC结构层厚度能显著降低U肋与顶板连接焊缝应力幅。
[Abstract]:In order to study the improvement effect of orthotropic composite deck slab of a new type of large longitudinal ribbed steel and ultra-high performance concrete (UHPC) on the mechanical performance of traditional orthotropic steel bridge slab. Based on 6 脳 110m continuous steel box girder bridge in deep water area of HongKong-Zhuhai-Macao Bridge, the finite element model of the whole bridge is established, and the static performance of two kinds of bridge deck schemes is compared, and the segmental finite element model is established. The fatigue behavior of the weld joint between U rib and roof of two bridge deck schemes is compared. The influence of the width of U-rib opening and the thickness of UHPC structure layer on fatigue behavior of large-longitudinal ribbed steel-UHPC orthotropic composite deck slab is analyzed. The displacement and stress of the control point of steel box girder under two kinds of bridge deck schemes are not different. The large longitudinal ribbed steel-UHPC orthotropic composite deck slab is suitable for medium span continuous beam bridge. The fatigue performance of large longitudinal ribbed steel UHPC orthotropic composite deck slab is significantly better than that of traditional orthotropic steel bridge panel. Increasing the width of U-rib opening will lead to the increase of stress amplitude of U-rib to roof joint weld, and increasing the thickness of UHPC structure layer can significantly reduce the stress amplitude of U-rib and roof joint weld seam.
【作者单位】：西南交通大学桥梁工程系;中铁大桥科学研究院有限公司;桥梁结构健康与安全国家重点实验室;
【基金】：自然科学基金项目(51578455,51178394,51378431) 国家科技支撑计划项目(2011BAG07B03)联合资助~~
【分类号】：U441
【正文快照】： 1引言正交异性钢桥面板作为现代桥梁工程的重要标志性创新成就,在大、中跨钢桥中得到广泛应用。但因结构受力特性、制造工艺限制及服役环境复杂等,正交异性钢桥面板疲劳开裂、桥面铺装耐久性不足等问题突出。随着钢桥的迅速发展和广泛应用,通过结构创新设计解决正交异性钢桥面

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