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针对工程中常见的钢筋混凝土简支梁结构进行研究,利用静力加载试验模拟简支梁的损伤累积过程,试验中采用沙袋对简支梁施加一突变荷载,对简支梁的自由振动信号进行分析,分析不同阻尼取值时模型的计算结果,分别采用粘性阻尼和库仑阻尼2种模型,利用自由振动信号分析2种阻尼在不同损伤等级下的变化规律,对已有的研究结果进行论证,从而进一步提出一种基于阻尼特征的损伤识别指标,并验证了该指标的优越性,将其应用到实际桥梁的检测中。结果表明:阻尼在钢筋混凝土桥梁中具有弱的非线性,提出的耗能指标较阻尼参数鲁棒性强,可在实际桥梁检测中的应用。
Aiming at the simple RC beam structure commonly used in engineering, the static load test is used to simulate the damage accumulation process of simply supported beam. In the experiment, a sudden load is applied to the simply supported beam by using sandbags. The free vibration signal of simply supported beam Analyzed and calculated the results of the model with different damping values, the two models of viscous damping and Coulomb damping were used respectively. The variations of two kinds of damping under different damage levels were analyzed by using free vibration signals. The existing research results were demonstrated, Therefore, a damage identification index based on damping characteristics is further proposed, and the superiority of the index is verified, which is applied to the actual bridge detection. The results show that damping has weak nonlinearity in reinforced concrete bridges, and the proposed energy consumption indexes are more robust than damping parameters and can be used in practical bridge inspection.