大跨斜拉桥拉索断裂的损伤诊断研究

根据大跨斜拉桥拉索的特点,提出用模糊模式识别理论对大跨斜拉桥的拉索进行损伤诊断。在损伤识别过程中,分析了拉索损伤位置和损伤程度对结构自振频率的影响,以结构损伤和完好状况下的自振频率归一化的频率差作为损伤标识量,以此建立拉索损伤的模糊模式识别子集,再利用模糊模式识别方法对拉索损伤位置和程度进行识别。为了证明该方法的可行性,对天兴洲大跨斜拉桥结构模型进行了数值仿真,并考虑了噪声的影响,结果表明该方法能够有效地识别拉索损伤。

Damage Identification of Cable of Long Span Cable-stayed Bridge

According to the characteristics of long-span cable-stayed bridge,damage identification of cable of long span cable-stayed bridge is proposed by fuzzy pattern recognition theory.In the damage identification process,the effects of the cable damage on natural frequency of structure is analyzed,and the normalized frequency difference of the structural natural vibration frequency between damage and intact structure is acted as the damage index,which is used as a subset of fuzzy pattern recognition,and then using fuzzy pattern recognition method to identify the location and extent of the cable damage.In order to prove the method,the numerical simulation is established of long-span cable-stayed bridge model for Tianxingzhou,and taking into account the impact of noise,the results show that the methods can be used to identify cable damage effectively.