未知集中荷载和风荷载共同作用下的结构识别问题研究

对同时作用有未知集中荷载和未知风荷载的剪切型结构的参数识别问题进行了研究。首先提出了直接消去法以解决顶部作用有集中未知荷载时程的剪切型结构的识别问题。对于仅作用未知风荷载的情况，使用简洁的直接代入方法识别结构参数。继而对同时作用有以上两种未知荷载的情况进行了研究。当相邻层的风载时程在时域上完全相关的假定成立时，结合直接消去法和直接代入法在识别出所有结构参数蹬同时反演出未知的集中荷载时程和风荷载时程。文后以文章的最后用仿真算例验证了所提算法的正确性，并对测量噪声对识别结果的影响进行了讨论。

Research on parameter identification of structure with unknown top-floor load and wind load

This article focus on the parameter estimation problem of structures subjected to unknown top-floor load and wind load simultaneously. Based on the identification equation of the problem, a direct elimination method is proposed to estimate the parameters of structure with unknown top-floor load. Unknown loads can readily be obtained after the parameters are estimated. For structures subjected to unknown wind load, a direct substituting procedure is developed. Under the presupposition that wind load of adjacent floors are totally dependent, the physical parameters can be identified and the wind load can be reconstructed consequently. For structures subjected to unknown top-floor load and wind load simultaneously, the structural parameters can be obtained using direct elimination method and direct substituting procedure synchronously. Numerical example is given to illustrate the effectiveness of the proposed methods, and the influences of noise are discussed in the last part of the paper.