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建立钢-混凝土组合结构截面二维谱元法模型,针对钢-混凝土界面完好以及存在界面剥离时模型在单点激励下弹性应力波场进行模拟分析,探究弹性应力波的传播规律。采用去除混凝土单元的方法反映组合结构中钢板与混凝土之间的界面剥离。通过对比分析表明界面剥离的存在对弹性应力波场以及模型上不同位置的位移响应产生影响。通过改变界面剥离程度,得到测点位移的变化规律。通过模拟,谱元法可以有效模拟钢-混凝土组合结构中弹性波的传播规律,为研究基于应力波测量的钢-混凝土组合结构界面缺陷检测机理提供帮助。
A two-dimensional spectral element method model of steel-concrete composite structure was established. According to the simulation of the elastic stress wave field under the single-point excitation with the steel-concrete interface intact and the interface debonding, the propagation law of the elastic stress wave was explored. The method of removing concrete elements reflects the interface delamination between the steel plate and the concrete in the composite structure. The comparative analysis shows that the existence of interface delamination affects the elastic stress wave field and the displacement response of different locations on the model. By changing the degree of interface peeling, the variation of measuring point displacement is obtained. Through the simulation, the spectral element method can effectively simulate the propagation law of elastic wave in the steel-concrete composite structure, and help to study the detection mechanism of interface defects of the steel-concrete composite structure based on stress wave measurement.