Experiment of Thermal Vibration Characteristics of Continuous Panels in Whole Steel-framed Structure(PDF)
《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]
- Issue:
- 2016年03期
- Page:
- 78-85
- Research Field:
- Publishing date:
Info
- Title:
- Experiment of Thermal Vibration Characteristics of Continuous Panels in Whole Steel-framed Structure
- Author(s):
- LI Bing; DONG Yu-li; WANG Yong; LOU Yong-jie
- College of Civil Engineering and Architecture, Hainan University
- Keywords:
- whole steel-framed structure; continuous panel; thermal vibration characteristic; Hilbert transform; principal frequency
- PACS:
- -
- DOI:
- -
- Abstract:
- Thermal vibration characteristics of four continuous reinforced concrete panels and two composite beams in a whole steelframed structure were tested by using the selfmade fire furnace. The acceleration signals of the building components during the fire were collected and Hilbert transform (HT) was adopted to extract instantaneous principal frequencies. Timedomain analysis and frequencydomain analysis of acceleration signals were performed. Timedomain analysis shows that acceleration signal intensity has important relationship with boundary constraints and crack propagation. When the constraints are stronger, the signal intensity is weaker. Moreover,main crack propagation leads to mutations of acceleration signals of heated panels, but for composite beams, stress redistribution and main crack propagation stimulate mutations of acceleration signals. During the heatup stage, acceleration curves can be divided into three stages.[HJ1.74mm]Acceleration signals are relatively low during the early and late stages but strong during the medium stage with more signal mutations are detected. Frequencydomain analysis shows that principal frequencies change dramatically and present a downward trend during the heatup stage, but the changes only reflect the level of crack propagation and cannot identify damage locations. In addition, the frequency changes correspond approximately to deflection changes in sequence. Therefore through analysis of vibration characteristics, the fire behavior including deformation and cracks can be monitored.
Last Update: 2016-06-01