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在强动力荷载作用下结构滞回力可直接描述损伤的发生发展过程,并用于结构耗能的定量评估。提出一种仅利用结构部分自由度上加速度响应时程且结构刚度、阻尼、质量均未知时的结构质量识别迭代和滞回力识别方法。首先基于质量预估值利用扩展卡尔曼滤波方法预测结构的位移和速度响应以及未知加速度响应,利用二重切比雪夫多项式对质量进行更新并迭代直到收敛,最后基于收敛的质量识别值描述结构滞回性能,识别结构滞回力。在一个多自由度集中质量数值模型中引入磁流变阻尼器模拟非线性构件,在结构仅已知部分自由度上加速度响应时程的条件下,数值模拟结果发现结构质量分布和阻尼器的滞回阻尼力均有良好的识别结果,同时考察了测量噪声的影响。
Under the action of strong dynamic load, the structural hysteretic force can directly describe the occurrence and development of damage and be used for the quantitative assessment of structural energy dissipation. A method of structure quality identification iteration and hysteresis force identification using only the acceleration response time histories of structural degrees of freedom and the structural stiffness, damping and mass are unknown. Firstly, based on the mass prediction, the displacement and velocity response of the structure and the unknown acceleration response are predicted by the extended Kalman filter. The quality of the structure is updated and iterated until the convergence by using the double Chebyshev polynomial. Finally, Back to performance, identify structural hysteresis. In a multi-degree-of-freedom mass-concentration numerical model, a magnetorheological damper is introduced to simulate the nonlinear component. Under the condition that the structure only knows the acceleration response time history of partial degrees of freedom, numerical simulation results show that the structure mass distribution and the damper’s hysteresis The back damping force has a good recognition result, at the same time examines the influence of the measurement noise.