超高性能混凝土-钢正交异性板组合桥面受力性能研究

发布时间：2019-08-19 10:33

【摘要】：针对柔性铺装正交异性钢桥面板存在的钢板疲劳开裂和铺装层极易损坏的问题,提出超高性能混凝土(UHPC)-钢正交异性板组合桥面体系。以武汉军山长江大桥为背景,通过ANSYS有限元仿真计算分析该组合桥面体系正交异性板相对于柔性铺装正交异性板受力性能的改善情况,并通过单U肋2跨连续梁足尺模型试验对UHPC层的受力性能进行研究。研究结果表明:采用组合桥面后正交异性板各构造细节的应力大幅下降,其中面板应力降幅最大,加劲肋次之,横隔板最小;采用UHPC-钢正交异性板组合桥面体系后正交异性板主要构造细节最不利热点应力幅降至常幅疲劳极限以下,理论上具有无限疲劳寿命;模型试验显示在实桥最不利应力作用下,UHPC层未发现可见裂纹,当名义应力达到18.79 MPa时在模型中支撑板顶部UHPC上发现0.05mm宽的裂纹。
[Abstract]:In order to solve the problem of fatigue cracking of steel plate and easy damage of pavement layer in flexible pavement orthotropic steel bridge deck, a composite bridge deck system of ultra-high performance concrete (UHPC)-steel orthotropic plate is proposed. Based on the background of Wuhan Junshan Yangtze River Bridge, the improvement of the mechanical properties of the orthotropic plate of the composite bridge deck system relative to the flexible pavement orthotropic plate is analyzed by ANSYS finite element simulation, and the mechanical performance of the UHPC layer is studied by the full-scale model test of the single U-ribbed 2-span continuous beam. The results show that the stress of the structural details of the orthotropic plate decreases greatly after the composite bridge deck, in which the stress drop of the panel is the largest, the stiffener is the second, and the transverse partition is the smallest, and the stress amplitude of the main structural details of the orthotropic plate after the composite bridge deck system of UHPC- steel orthotropic plate is reduced to below the constant fatigue limit, which theoretically has infinite fatigue life. The model test shows that no visible cracks are found in the UHPC layer under the most unfavorable stress of the real bridge. When the nominal stress reaches 18.79 MPa, the crack with 0.05mm width is found on the top UHPC of the support plate in the model.
【作者单位】：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;
【分类号】：U441

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