Health Monitoring of 4-Story Steel Moment Frame Before and After the Collapse Test

Abstract eng:
Changes of modal parameters of a full scale 4-story steel building due to construction progress or seismic damage are evaluated in the shaking table test of the 2007 E-defense project, which are expected to employ as damage index of structural health monitoring. To evaluate the modal parameters, the continuous ambient vibration test has been conducted since the building was in bare steel frame state. After the ambient vibration test was started, the floor slabs are cast and non-structural components were installed. After the completion, various levels of seismic excitations were given to the building, and finally the building collapsed on the first floor. Through such process of the construction and the excitation test, a series of ambient vibration record in eighty days is obtained. The modal parameters in every five minutes are successively estimated by the cross-spectrum based modal identification. From the results, changes of the modal parameter are discussed on different states of construction as well as before and after the seismic excitations, which are very useful to develop the vibration-based damage detection. Change of the modal parameter due to different levels excitations is also investigated by using several small excitation records, which can be caused by changes of story-stiffness increment added by the non-structural components.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket