基于模态应变能的水工泄流结构损伤识别研究

Damage Detection of Flood Discharge Structure Based on Modal Strain Energy

逐渐积累的损伤会使水工泄流结构中特定部分的质量或刚度损失而引起结构动力特性发生变化,这都将在模态测量中有所反映,以结构模态参数为基础,准确判断泄流结构所存在的损伤(特别是水下部位),对整个泄水建筑物的安全至关重要。以水工泄流结构中的弧形钢闸门及混凝土导墙结构为例,研究了基于结构模态参数的水工泄流结构损伤识别方法,基于单元模态应变能方法对泄流结构不同位置相同程度的损伤以及不同位置不同程度的损伤进行了识别。结果表明,该方法可以准确识别泄流结构的损伤,对基于振动响应的泄流结构无损动态检测及其水下部位隐患诊断具有一定的应用价值。

The quality and stiffness loss of flood discharge structure would change its dynamic characteristics because of the gradual accumulated damage.And it would be reflected in the modal tests.For the security of the entire discharge structure,it＇s of great essential to detect the damage（such as the underwater sites） based on structural modal parameters.Taking the radial gate structure and the concrete guide wall structure as an example,this paper studied the damage detection method of flood discharge structure based on modal strain energy,identifies the damage occurred in different locations with the same degree of damage and in different locations with different degree of damage.The results show that the method can accurately identify the structural damage of discharge structure.For non-destructive dynamic detection and risk diagnosis of flood discharge based on dynamic response,this method can provide reference value.