RC空心板梁疲劳刚度退化规律试验研究

发布时间：2018-05-02 20:16

本文选题：桥梁工程 + 刚度退化　；参考：《公路交通科技》2014年09期

【摘要】：桥梁结构刚度随损伤发展会逐渐发生不可逆的退化,刚度退化与疲劳损伤之间有一定的内在关联,通过疲劳试验研究了刚度退化的规律和计算方法。疲劳试验发现钢筋混凝土空心板梁的刚度呈现出明显的三阶段退化规律:在0~0.15Nf阶段,梁的挠度增长非常明显,甚至可以达到疲劳破坏时总挠度的40%,但挠度增长速率逐渐变小;在0.15Nf~0.90Nf阶段,梁的挠度增长速率逐渐变小直至接近某一较小的常数;在0.90Nf~Nf阶段,梁的挠度增长速率逐渐变大,开始进入脆性疲劳断裂阶段,试验梁很快疲劳破坏。刚度退化曲线符合S形形态。根据刚度退化规律对试验数据进行拟合,得到可用于计算钢筋混凝土空心板梁刚度退化程度的公式,该公式与5根试验梁的试验结果吻合度较好,能够实现对刚度退化的定量描述。
[Abstract]:The stiffness of bridge structure will be irreversibly degraded with the development of damage, and there is a certain internal relation between stiffness degradation and fatigue damage. The regularity and calculation method of stiffness degradation are studied by fatigue test. The fatigue test shows that the stiffness of reinforced concrete hollow slab beams is degraded in three stages: in the 0~0.15Nf stage, the deflection of the beam increases obviously, even reaching 40 percent of the total deflection during fatigue failure, but the increasing rate of deflection becomes smaller gradually; In the 0.15Nf~0.90Nf stage, the deflection growth rate of the beam becomes smaller until it is close to a smaller constant, while in the 0.90Nf~Nf stage, the deflection growth rate of the beam becomes larger and begins to enter the brittle fatigue fracture stage, and the fatigue failure of the test beam is quick. The stiffness degradation curve accords with S shape. According to the law of stiffness degradation, the experimental data are fitted and a formula for calculating the degree of stiffness degradation of reinforced concrete hollow slab beams is obtained. The formula is in good agreement with the experimental results of five test beams. The quantitative description of stiffness degradation can be realized.
【作者单位】：武汉科技大学城市建设学院;武汉理工大学华夏学院;
【基金】：交通运输部西部交通建设科技项目(200631800019) 湖北省自然科学基金项目(2011CDB239)
【分类号】：U441.4

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