疲劳荷载作用下的植筋混凝土梁刚度分析及计算

摘要

Rebar-planting technology is widely used in the engineering field to connect anchor technology.Fatigue failure is a fatal damage for the reinforced concrete structure bearing fatigue load repeatedly.In order to research the bending behavior under fatigue loading,three anchorage bar beams with the same embedment depth were tested.Research shows that:the stiffness of rebar-planting beam has been reduced under fatigue loading,the fatigue damage to the rebar-planting beam due to low frequency loading was greater than high frequency loading;through the analysis of stiffness degradation, establishing the stiffness degradation of function and fitting the test data, the stiffness degradation function was obtains.And, the formula has a perfect goodness contact with the experimental results, which realizes the calculation of the fatigue stiffness of reinforcement beam and is able to achieve the quantitative description of the fatigue stiffness of rebar-planting beam.%植筋技术是一种被广泛应用于工程界的连接锚固技术.对承受疲劳循环荷载的植筋梁而言,疲劳破坏是一种重要的损伤形式.为了分析植筋处于疲劳状态下的工作性能,共设计制作了3根相同植筋深度的混凝土梁试件,并对其进行疲劳试验下的受弯试验.试验表明:植筋梁的刚度在疲劳加载下有了一定的降低,低频加载对梁体造成的损伤大于高频加载;通过对刚度退化的分析,建立符合刚度退化规律的函数,对试验数据进行拟合,得出刚度退化系数函数,与结果吻合较好,实现了对植筋梁疲劳刚度的计算,能够对植筋梁疲劳刚度进行定量描述.