【摘要】 提出一种基于泄洪激励下动响应能量进行高拱坝损伤识别的互熵矩阵曲率法,即利用拱坝损伤前后的相对响应熵矩阵,分别对其列、行进行差分求得互熵曲率矩阵,并以其对角元素作为检测拱坝结构损伤指标的新方法。该方法仅需拱坝的环境激励响应信号,不论对其单一损伤、轻微损伤,还是多种损伤,均能够定位损伤和定性反映损伤程度。通过数值模拟分析,验证了该方法检测拱坝损伤的有效性。更多还原

【Abstract】 The concept of energy cross-entropy curvature matrix is proposed based on the structural vibration response,and it is used as a new index for arch dam damage detection under flow-induced vibration.The index is obtained with the structural vibration energy cross-entropy calculated twice before and after damage occurs by means of difference calculation,firstly to columns,and then to rows.Then the new indicator is constructed through principal diagonal elements based on the curvature difference matrix in energy cross-entropy.Numerical simulation examples indicate that the damage location and severity in structures,with single damage,multiple ones and lighter ones,can be detected efficiently through only the ambient excitation of arch dam.The results confirm the effectiveness of the proposed method.更多还原