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Research on Fatigue Property of Novel Composite Decks with Large-Scale Corrugated Steel Plate and UHPC Layer
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摘要: 基于各类组合桥面结构研究，提出了一种新型大纵肋波折钢板–高性能混凝土（UHPC）组合桥面板；组合桥面板利用UHPC优异的材料性能提高桥面板刚度并减轻桥面板自重，并通过大尺寸U肋的波折钢板减少焊缝数量，以提高结构的疲劳性能。通过对新型组合桥面板疲劳性能的研究，发现UHPC层厚度的增大和横隔板间距的减小能够有效地降低波折钢板以及横隔板上各疲劳细节的应力幅值，推荐采用70~90 mm的UHPC板厚以及4 m以内的横隔板间距。此外，增大U肋的高度同样也能够降低多数疲劳细节的应力幅值，但会增大U肋斜腹板与横隔板间焊缝的疲劳应力幅值。通过对UHPC层疲劳性能的研究发现，增大板厚和配筋率能够有效地提高其疲劳性能；对于厚度小于9 cm的UHPC层，可以通过最小配筋率以保证其疲劳性能满足要求。
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关键词:
- 大纵肋波折钢板 /
- UHPC /
- 波折钢板-UHPC组合桥面板 /
- 波折钢板疲劳 /
- UHPC疲劳
Abstract: Based on the current studies of various composite bridge decks, a novel composite deck with large-scale corrugated steel plate and ultra-high performance concrete (UHPC) layer is proposed. The fatigue property of the composite deck will be enhanced by increasing rigidity through the high-performance of UHPC and decreasing weld joints through large-scale corrugated steel plate. With the fatigue studies of the novel composite decks, it can be found that the increase of the UHPC thickness and the decrease of the diaphragm distance will reduce the fatigue stress amplitude of all fatigue details, so a UHPC thickness of 70–90 cm and a spacing of less than 4 cm between diaphragms are recommended. The increase of the U-rib height will also reduce the stress amplitude of almost all fatigue details, except the fatigue detail between the web of the U-rib and the diaphragm. Meanwhile, the UHPC thickness and the reinforcement ratio are the critical factors of the fatigue property of the UHPC layer. For the UHPC layer with the thickness less than 9 cm, the limitation of the minimum reinforcement ratio will ensure the fatigue property of the UHPC layer. -
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