Performance and Tracking of Nonstructural Systems in a Full-Scale Building

PI‘s：塔拉·C·哈钦森，系加州大学欧文分校土木工程与环境工程系加州大学欧文分校电气工程和计算机科学学院这一小额探索性研究基金(SGER)被要求利用一个独特的机会来研究在全尺寸建筑结构中组装的非结构系统的响应。拟议的调查有两个主要目标：(1)表征一类重要设备和建筑物内容的地震响应；(2)研究利用基于图像的监测系统阵列跟踪这些设备和内容的响应的适用性。要求SGER提供资源，为建筑物内部的一些房间配备非结构设备和摄像机阵列，以评估这两个系统的性能。我们希望在SGER下开展的工作将证明这一想法在全尺寸建筑结构中的适用性，并确定在这一过程的图像获取和分析部分需要进一步研究的领域。因此，从拟议的现场实验中收集的数据将对开发一个更大的提案至关重要，该提案使用NEES设备来研究替代的计算机视觉和运动跟踪算法，以推进基于相机的系统作为地震监测技术。感兴趣的建筑是位于加利福尼亚州谢尔曼奥克斯市北塞普尔韦达大道4827号的一座四层建筑(距离加州大学欧文分校约80公里)。这座建筑在1994年北岭地震中遭到严重破坏，自这次地震以来一直没有人入住。通过NSF提供的单独资金，约翰·华莱士教授将使用加州大学洛杉矶分校的NEES移动设备单元对该结构进行现场振动实验。计划中的振动实验包括在建筑物的屋顶上放置一对线性和偏心质量振动器，并在两个垂直方向上驱动结构。此外，还将使用一对振动器将扭转运动施加到结构中。虽然非常重视研究这座建筑的结构响应，但这个实地项目也提供了一个独特的机会来研究安装在结构内的元件的响应。

PI's: Tara C. Hutchinson, Dept. of Civil and Environmental Engineering, University of California, Irvine and Falko Kuester, Dept. of Electrical Engineering and Computer Science, University of California, IrvineThis small grant for exploratory research (SGER) is requested to take advantage of a unique opportunity tostudy the response of nonstructural systems assembled within a full-scale building structure. The proposed investigation has two primary objectives: (1) to characterize the seismic response of an important class of equipment and building contents and (2) to study the applicability of tracking the response of these rquipment and contents using arrays of image-based monitoring systems. An SGER is requested to providethe resources to outfit a number of rooms within the interior of the building with nonstructural equipmentand camera arrays to assess performance of both of these systems. We hope the work conducted under thisSGER will demonstrate the applicability of this idea for use in full-scale building structures and identify needed areas for further study in the image acquisition and analysis portion of the process. As such, datacollected from the proposed field experiments will be critical for the development of a larger proposal using NEES equipment to investigate alternative computer vision and motion tracking algorithms to advance camera-based systems as an earthquake monitoring technology.The building of interest is a four-story building located at 4827 North Sepulveda Blvd., ShermanOaks, California (approximately 80 km from the UC Irvine campus). The building was damaged significantly during the 1994 Northridge earthquake and has not been occupied since this event. Through separate funding provided by NSF, Professor John Wallace will use the UCLA NEES Mobile Equipment Unit to conduct field vibration experiments on this structure. Planned vibration experiments include placing pairs of linear and eccentric mass shakers on the roof of the building and driving the structure in the two orthogonal directions. In addition, a pair of shakers will be used to impose torsional motions into the structure. While much emphasis is placed on studying the structural response of this building, this field project provides a unique opportunity to study the response of elements mounted inside of the structure as well.