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由于梁式结构的应变状况与其刚度有直接关系 ,因此对应变模态的测量可望用于桥梁损伤识别。梁的曲率模态和应变模态是直接关联的。通过对实桥标准简支梁损伤的数值仿真 ,揭示了曲率模态对桥梁损伤的敏感性。为便于检测损伤 ,还提出了一个新的损伤识别指标—应力变化陡峭度D,并推荐一种具有高灵敏度和高一致性的 DP型低频振动传感器作为实桥应变模态测量的信号检测设备
Since the strain of beam structure is directly related to its stiffness, the measurement of strain mode is expected to be used for bridge damage identification. Beam curvature mode and strain mode are directly related. Through the numerical simulation of the standard bridge simply supported beam damage, the sensitivity of the curvature mode to bridge damage is revealed. In order to facilitate the detection of damage, a new damage identification index-steepness of stress change D is proposed. A DP-type low frequency vibration sensor with high sensitivity and high consistency is recommended as a signal detection device for real-bridge strain mode measurement