Alternate Path Method for Progressive Collapse Resistant Design of Steel Framed Structures

2015 ◽  
Author(s):  
O.A. Mohamed ◽  
M.G. Tarmoom
Keyword(s):  
Progressive Collapse ◽  
Framed Structures ◽  
Alternate Path Method

Progressive Collapse Evaluation for Historic Building Structures

2010 ◽  
Vol 133-134 ◽  
pp. 1225-1231 ◽  
Author(s):  
Feng Lin ◽  
Ying Wang ◽  
Xiang Lin Gu ◽  
Xin Yuan Zhao
Keyword(s):  
Service Life ◽  
Material Properties ◽  
Progressive Collapse ◽  
Failure Criteria ◽  
Seismic Action ◽  
Historic Buildings ◽  
Building Structures ◽  
Historic Building ◽  
Current Design ◽  
Alternate Path Method

Important historic buildings may be subjected to accidental loads during their service life. It is therefore necessary not only to evaluate their safety under traditional loads and seismic action (only in earthquake area), but also to evaluate the structural performance of resisting progressive collapse. For historic buildings, two aspects make them different from the modern buildings: the material properties are usually deteriorated to some extent, and the structural system/constructions may not meet the requirements of current design and construction codes. Considering such aspects, a method consisting of four steps to evaluate the performance of the historic buildings to resist progressive collapse is presented in this paper. Firstly, the building layout should be evaluated whether it can protect the occupants from the possible explosion. Secondly, geometrical information, structural constructions and the material properties are to be investigated in details. Thirdly, by means of tie force method and the alternate path method the performance of the structure is analyzed to resist progressive collapse. The load combinations used in the analysis are derived based on the expected service life of the structure. The failure criteria for the structural elements as well as the damage limits for the structure follow the provisions addressed in American Unified Facilities Criteria “Design of Structure to Resist Progressive Collapse” (UFC 4-023-03). Finally, based on the above information an overall evaluation is made for the probably structural retrofitting and strengthening. This method is illustrated with a case study of a steel frame historic building, namely the Bund 18 building, in Shanghai, China. Some suggestions for retrofitting and strengthening this building are also presented.

Numerical Simulation of Progressive Collapse and Study of Resisting Progressive Collapse of Spatial Grid Structures Based on ANSYS/LS-DYNA

2011 ◽  
Vol 243-249 ◽  
pp. 6202-6205 ◽  
Author(s):  
You Liang Fang ◽  
Zhen Zong Zhao
Keyword(s):  
Numerical Simulation ◽  
Numerical Analysis ◽  
Design Method ◽  
Progressive Collapse ◽  
Reference Value ◽  
Grid Structure ◽  
Alternate Path Method ◽  
Spatial Grid

In this paper, different destruction forms of spatial grid structure are analyzed based on LS-DYNA. The key members of structure are studied and the collapsing processes of spatial grid structure caused by different failure members are simulated numerically. By comparing the results of numerical analysis, divisional design method is proposed based on the alternate path method (AP method). The divisional design method can improve resistance to progressive collapse obviously and is of certain reference value for engineering.

scholarly journals Progressive Collapse Mechanisms of Brittle and Ductile Framed Structures

2010 ◽  
Vol 136 (8) ◽  
pp. 987-995 ◽  
Author(s):  
E. Masoero ◽  
F. K. Wittel ◽  
H. J. Herrmann ◽  
B. M. Chiaia
Keyword(s):  
Progressive Collapse ◽  
Framed Structures ◽  
Collapse Mechanisms
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