轻骨料混凝土梁的损伤诊断

Damage Diagnosis of Lightweight Aggregate Concrete

利用数值模拟和实验分析的方法,对正则化频率变化率在钢筋陶粒混凝梁进行损伤诊断,得出以下结论:正则化频率无法识别对称结构对称位置的损伤;低阶的频率变化率单调性较好,高阶的频率变化率重复性较大;钢筋轻骨料混凝土梁的第一、二阶正则化频率变化率组合曲线诊断损伤位置的效果较好.

The damage of structure results in the reduction of the partial rigidity and the loss of the mass,which in turn lead to the alteration of dynamic character（frequency,mode and damping）.The frequency is measured easily and its result is precise.The effectiveness of normalized change ratio of frequency in the reinforced lightweight concrete beams is investigated and studied by experiment and numerical simulation in the paper.It does not identify the damage of the symmetrical position.Low-step frequency fingerprints curves are much better.The more the step of frequency fingerprints curves,the more repeatability.The sectioned curves of the first and the second frequency fingerprints curves in reinforced lightweight aggregate concrete beams of diagnosis is better.