【摘要】 目的研究一种识别地震作用荷载的方法,为地震作用荷载的识别与相应结构的动力特性、损伤的识别提供一种新的途径,进一步为结构的安全性、损伤进程和耐久性等研究提供理论参考.方法利用Kanai-Tajimi模型将单位强度白噪声过程模拟为未知的地震作用,并将其作用在结构上,然后根据数值模拟计算得到的结构体系响应作为观测量,采用Kalman滤波对未知荷载状态加以识别.结果最终可以利用结构的加速度响应反演得出地震作用的等效荷载,在人工添加5%观测噪声的条件下,最大误差率为7%左右,而在人工添加10%观测噪声的条件下,最大误差率为8%左右.结论通过算例的验证,说明笔者所采用的方法精度较高,获得了较好的识别效果.更多还原

【Abstract】 The purpose of this paper is to study an newearthquake excitation load identification method for providing a newway of identification for dynamic behavior and damage of structures.Adopting the Kanai-Tajimi model,a unit intensity white-noise process was simulated as a unknown earthquake excitation and subjected to a structure. Taking structure responses calculated by numerical simulation as observations and using Kalman filter,the unknown load state was estimated. From the acceleration responses of the structure,the earthquake excitation equivalent loads were obtained. It is found that the maximum error ratio is about 7%,if the input observation noise is 5%.And the maximum error ratio is about 8% with 10% input observation noise. Calculated results ofexamples indicate that the proposed method has higher precision and good identification result.更多还原