Modeling for Progressive Collapse Mitigation Using Nonlinear Static Analysis Procedures

In this study, three tie force models of a 10-storey concrete frame structure were prepared to investigate the effects of these methods on the resistance of frame structures against progressive collapse. Four cases of different first-storey column removed were considered using nonlinear static analysis method and their performances were compared with each other. From the nonlinear static analysis, the tie force methods in DoD 2005 and DoD 2009 cannot improve progressive collapse resistance of the structure because horizontal cables don't play a full role. X-type tension cables provide alternative load paths after loss of a single column, and improve progressive collapse resistance of the structure. The X-type tie force model remained in stable condition after sudden removal of a corner column, an exterior column, or an interior column in the first storey.

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Nonlinear Static Analysis for Progressive Collapse Potential of RC Building

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.94-96.146 ◽

2011 ◽

Vol 94-96 ◽

pp. 146-152 ◽

Cited By ~ 2

Author(s):

Tie Cheng Wang ◽

Zhi Ping Li

Keyword(s):

Static Analysis ◽

Progressive Failure ◽

Progressive Collapse ◽

Frame Structure ◽

Nonlinear Static Analysis ◽

Collapse Potential ◽

Concrete Frame ◽

Rc Building ◽

Edge Span ◽

Nonlinear Static

In this study, the progressive collapse potential of a 10-storey concrete frame structure was investigated using nonlinear static analysis. 15 different cases were considered and their performances were compared with each other. From the nonlinear static analysis results, most of longitudinal beams in upper floors and slabs above the failure column would collapse as the results of removing an exterior column, no beams and slabs would collapse when an interior column at ground floor was removed, and only the short-span beams in superstructure would collapse when an interior column in upper floors was removed. Tie force reinforcement along floors and beams of edge span can be used to avoid the progressive failure of floors, after failure of particular column.

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Progressive Collapse Analysis of Reinforced Concrete Structures: A Simplified Procedure

European Journal of Engineering Research and Science ◽

10.24018/ejers.2017.2.10.474 ◽

2017 ◽

Vol 2 (10) ◽

pp. 7 ◽

Cited By ~ 5

Author(s):

Arash Naji ◽

Mohamadreza Rohani

Keyword(s):

Reinforced Concrete ◽

Dynamic Analysis ◽

Static Analysis ◽

Progressive Collapse ◽

Concrete Structures ◽

Nonlinear Static Analysis ◽

Reinforced Concrete Structures ◽

Collapse Analysis ◽

Nonlinear Static ◽

Progressive Collapse Analysis

In this paper, a simplified analysis procedure to calculate the column removed point displacement at progressive collapse analysis of reinforced concrete structures is proposed. The energy absorption capacity under the column missing event is used for formulations. The approximate method is simple to utilize, user friendly, yet accurate. For progressive collapse analysis of structures, linear static analysis, nonlinear static analysis, linear dynamic analysis and nonlinear dynamic analysis can be performed. In this paper, the nonlinear static analysis from alternate load path method is used and the reason of initial local collapse has not been considered. In fact, an energy-based method by using load-displacement curve of RC frame and considering the effect of floor slab for the progressive collapse analysis is considered. The accuracy of the proposed method is demonstrated by comparing the results to three experimental and analytical results. Finally, the effects of the spans length, sections dimensions, material properties and the beams reinforcements of column removed spans on substructure behavior is studied, as well.

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Improvement of progressive collapse resistance potential of semi-rigid jointed steel frames through bracings

International Journal of Protective Structures ◽

10.1177/2041419616668085 ◽

2016 ◽

Vol 7 (4) ◽

pp. 518-546

Author(s):

Milan Bandyopadhyay ◽

Atul Krishna Banik

Keyword(s):

Static Analysis ◽

Progressive Collapse ◽

Steel Frames ◽

Nonlinear Dynamic Analysis ◽

Nonlinear Static Analysis ◽

Braced Frame ◽

Collapse Resistance ◽

Column Removal ◽

Rigid Frames ◽

Nonlinear Static

Progressive collapse studies of both unbraced and braced semi-rigid jointed steel frames have been carried out to evaluate the contribution of bracings in improving progressive collapse resistance potential. Numerical models of 10-story frames with different types of semi-rigid connections have been developed using SAP2000. Progressive collapse potential of semi-rigid frames is first investigated without bracings. Bracings are then included in a systematic manner, and response of the braced frame is compared with that of unbraced frame to evaluate the contribution of bracings. Two different arrangements of bracings, that is, bay-wise and floor-wise arrangements, are considered to find out a preferred arrangement of bracings. Parametric studies include eight column removal conditions at center and corner locations of different floors. Development of catenary action has also been considered as it gives additional resistance, especially to braced frame. Apart from nonlinear static analysis, effects of bracings are evaluated also through nonlinear dynamic analysis and the responses of the frames in nonlinear dynamic analysis are compared with those of nonlinear static analysis. From the study, it is found that provision of bracings significantly improves the progressive collapse resistance potential of the semi-rigid frames under different column removal conditions. Floor-wise arrangement of bracings is much effective as compared to bay-wise arrangement.

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