【摘要】 研究斜拉桥结构在斜拉索和主梁组合损伤条件下的损伤定位问题。根据斜拉桥的受力特点,将其看作由斜拉索、主梁以及索塔组成的组合结构,对于斜拉索和主梁分别选取相应的损伤敏感指标,首次提出了斜拉索损伤定位的斜拉索索力指标,在此基础上提出了斜拉桥损伤定位的组合敏感指标法。为了降低测试数据噪声对损伤定位的影响,引入蒙特卡罗法提高方法的准确性和鲁棒性。对一斜拉桥结构进行了损伤识别的数值模拟分析,研究表明该方法仅需不完备的低阶振型模态和索力测试数据,即可实现斜拉索和主梁组合损伤的准确定位。更多还原

【Abstract】 Damage location identification for composite damages of cable and girder in a cable-stayed bridge is studied.Cable-stayed bridge is regarded as composite structure composed of cables,girders and towers based on its mechanical properties and cable tension index for damage location identification of cable is first presented in this paper.Based on reasonable selection of damage sensitivity indexes for cable and girder,composite sensitivity index method for damage detection of cable-stayed bridge is developed.Monte Carlo method is employed in order to alleviate the effect of measurement noise and improve robustness of proposed method.A numerical simulation is studied on a cable-stayed bridge to demonstrate the validity and feasibility of the suggested algorihm.更多还原