基于曲率模态的钢筋混凝土梁损伤检测研究

阐明了曲率模态的基本原理。对钢筋混凝土简支梁进行逐级加荷-卸荷试验,每次卸荷后进行动态检测试验,用DASP系统对试验数据进行分析,得到位移模态。利用二阶差分法,由位移模态得到了曲率模态。结果表明,曲率模态能较为准确地识别钢筋混凝土简支梁的损伤,且对微小损伤较为敏感,高阶的曲率模态对于损伤的敏感性高于低阶曲率模态。利用曲率模态能够较好地判定损伤的位置以及损伤的相对程度。

Study on Damage Detection of Reinforced Concrete Beam Based on Curvature Mode

The basic principle of curvature mode is discussed. Dynamic test was carried on reinforced concrete beams.In the test,beam was subjected to an increasing static load in the middle to introduce cracks,and the last load step corresponded to failure.After each loading step,an experimental dynamic monitoring was performed on the beam.Test data are analyzed by means of the system of Data Acquisition Signal Process,and the displacement mode is demonstrated.The curvature unloading mode is gained from the displacement mode with second order differentiation method.The results show that curvature mode can identify the damage of reinforced concrete simple-supported beam more accurately,and it is more sensitive to tiny damage.The high order curvature mode is more sensitivity than low order curvature mode.Curvature modal can be used to identify damage location and its relative degree.