Influence of Column Failure on Progressive Collapse of Multi-story Steel Frames Under Fire(PDF)
《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]
- Issue:
- 2018年05期
- Page:
- 203-210
- Research Field:
- Publishing date:
Info
- Title:
- Influence of Column Failure on Progressive Collapse of Multi-story Steel Frames Under Fire
- Author(s):
- ZHANG Zhuang-nan; YANG Yue; LI Hai-ping
- School of Civil Engineering, Shenyang Jianzhu University
- Keywords:
- fire; steel frame structure; progressive collapse; birth and death element method; finite element analysis
- PACS:
- -
- DOI:
- -
- Abstract:
- In the analysis of continuous collapse of steel structure, the direct demolition method was mostly used, but because of the continuous collapse of steel structure was caused by fire, the actual situation could not be truly reflected. Therefore, it was very important to analyze the resistance of steel structure to continuous collapse under fire. A multilayer steel frame model without floor was established by using ANSYS finite element software. The thermal and solid coupling method was used to consider the failure of fire, and the material nonlinearity and geometric nonlinearity were taken into account comprehensively. The continuous collapse resistance of steel frame structures under fire and the number of allowable failure columns in the corner region were studied, and the results were compared with the results of direct dismantling method used in the existing literature. The results show that the continuous collapse process of steel frame can be simulated by the method of thermal structural coupling in ANSYS, combined with the method of life and death unit. By analyzing the working conditions of different number of failure columns in 3 kinds of corner regions, the number of allowable numbers of the failure columns is 3. The results of the finite element analysis of dismantling method and the results of finite element analysis are compared. It is found that the result of direct dismantling is too conservative. Considering the fire is more close to the actual collapse situation.
Last Update: 2018-09-03