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为解决目前多数梁式结构的损伤识别方法精度不足,且缺少模型试验对数值模拟结果进行验证等问题,利用模态应变能原理,运用数值分析和试验研究的方法对简支工字形钢梁的损伤识别进行研究。研究结果表明:模态应变能法可识别出简支梁内部的损伤;与通过固有频率变化的损伤识别相比,模态应变能法在梁损伤位置及损伤程度识别方面具有明显优势。
In order to solve the problems that the accuracy of the damage identification methods of most beam structures is not enough and the model test is lacking to validate the numerical simulation results, the modal strain energy principle is used to analyze the damage of simply supported I-shaped steel beams by means of numerical analysis and experimental study Damage identification is studied. The results show that the modal strain energy method can identify the damage inside the simply supported beam. Compared with the damage identification through the natural frequency, the modal strain energy method has obvious advantages in beam damage location and damage identification.