基于PCA及提升小波组合算法提取建筑物结构振动信号

针对监测结果受测量噪声和多路径等GPS误差影响的问题,提出基于PCA及提升小波的组合算法来提取建筑物结构振动信号。利用PCA空间滤波分离区域站点相关的共模误差,然后利用提升小波变换对振动信号进行降噪,用于提取结构振动信号。以香港某高楼在台风荷载作用下的观测数据为例进行实验,结果表明,此算法有效提高了变形监测的精度。

Passive control experiment of building with spacious first story by magnet-friction energy dissipation device

Based on the former performance capacity experiments of the magnet-friction energy dissipation devices, including the permanent magnet-friction energy dissipation device (PMF) and electromagnet-friction energy dissipation devices (EMF), a 5-story steel frame model with spacious first story is designed and made according to a scale of 1/4. The magnet-friction energy dissipation devices can realize continuously varied controlling force, with rapid response and reverse recognition. Therefore, they overcome shortcomings usually found in energy dissipation devices whose force models are invariable. The two kinds of devices were fixed on the flexible first story of the structure model, and the shaking table tests have been carried out, respectively. In these tests, the performance of the devices and their effectiveness in structural control were confirmed. In this paper, the test results and analysis are discussed.