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

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.

Progressive Collapse Resistance of RC Structures with Tension Cables

2013 ◽  
Vol 405-408 ◽  
pp. 835-840
Author(s):  
Tie Cheng Wang ◽  
Zhi Ping Li ◽  
Hai Long Zhao
Keyword(s):  
Static Analysis ◽  
Progressive Collapse ◽  
Stable Condition ◽  
Frame Structure ◽  
Nonlinear Static Analysis ◽  
Force Model ◽  
Rc Structures ◽  
Concrete Frame ◽  
Collapse Resistance ◽  
Nonlinear Static

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.

Applications of Capacity Spectrum Method for Buildings With Metallic Yielding Dampers

2005 ◽  
Author(s):  
Bo-Jen Chen ◽  
C. S. Tsai ◽  
L. L. Chung ◽  
Tsu-Cheng Chiang
Keyword(s):  
Static Analysis ◽  
Nonlinear Dynamic Analysis ◽  
Iteration Procedure ◽  
Nonlinear Static Analysis ◽  
Severe Damage ◽  
Capacity Spectrum Method ◽  
Spectrum Method ◽  
Capacity Spectrum ◽  
Earthquake Resistant ◽  
Nonlinear Static

The 921 Chi-Chi Earthquake was one of the most destructive earthquakes in Taiwan in the twentieth century. The earthquake caused severe damage or collapse to the residential and public structures. It is a sensible choice to utilize the metallic yielding dampers for retrofitting damaged structures and to enhance earthquake-resistant capacity of new structures. In this paper, in order to facilitate the designs of the metallic yielding dampers, an improved nonlinear static analysis iteration procedure based on the capacity spectrum method for buildings with metallic yielding dampers has been proposed. The numerical results of the buildings with the metallic yielding dampers through the nonlinear static analysis iteration procedure and the nonlinear dynamic analysis have been obtained, compared and verified in this study. Moreover, it is also illustrated that the proposed nonlinear static analysis iteration procedure based on the capacity spectrum method for structures with metallic yielding dampers can fairly predict the seismic responses of the buildings with metallic yielding dampers during the earthquakes.

Nonlinear Static Analysis for Progressive Collapse Potential of RC Building

2011 ◽  
Vol 94-96 ◽  
pp. 146-152 ◽  
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.

scholarly journals Progressive Collapse Analysis of Reinforced Concrete Structures: A Simplified Procedure

2017 ◽  
Vol 2 (10) ◽  
pp. 7 ◽  
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.

scholarly journals Progressive Collapse Analysis of multi-story building under the scenario of multi-column removal

2019 ◽  
Vol 136 ◽  
pp. 04050 ◽  
Author(s):  
M. Nassir ◽  
J. Yang ◽  
S. Nyunn ◽  
I. Azim ◽  
F.L. Wang
Keyword(s):  
Static Analysis ◽  
Progressive Collapse ◽  
Analysis Procedure ◽  
Collapse Resistance ◽  
Collapse Analysis ◽  
Column Removal ◽  
Concrete Building ◽  
Column Removal Scenario ◽  
Progressive Collapse Analysis ◽  
Story Building

Recent studies regarding progressive collapse resistance of buildings considered only single critical column removal scenario. However, limited investigations have been conducted so far to assess multi-column removal scenarios. Hence this study is made to compare progressive collapse resistance of a multi-story building under both single and multi-column removal scenarios. An eight-storey reinforced concrete building was analyzed by using linear static analysis procedure and DCR values of the members are calculated to investigate the potential of progressive collapse as per GSA guideline. The values of DCR are compared for different cases. Comparisons of single and multi-column removal scenarios reveal that later scenarios are more critical because of their higher demand capacity ratios, and it is more critical when both corner and exterior columns are removed.

scholarly journals Progressive collapse scenario in steel structures with irregularity in height

2021 ◽  
Vol 73 (09) ◽  
pp. 893-905
Keyword(s):  
Cross Sections ◽  
Progressive Collapse ◽  
Great Influence ◽  
Nonlinear Dynamic Analysis ◽  
Structural Response ◽  
Steel Structures ◽  
Nonlinear Static Analysis ◽  
Load Path ◽  
Engineering Structures ◽  
Column Removal

Sudden removal of load-bearing elements such as columns in engineering structures, and lack of sufficient capacity to withstand the overload caused by removal of these elements can cause damage and Progressive Collapse (PC) in structures. Therefore, the effect of sudden column removal and structural capacity against PC scenarios in medium and high-rise buildings is investigated in this study. The irregularity in height has a great influence on lateral behaviour of structures and it affects the design of cross-sections. Various sudden column removal scenarios are investigated in this research for steel structures with and without irregularity in height. To assess the effects of sudden column removal, the Alternate load Path Method (APM) and Nonlinear Dynamic Analysis (NDA) are utilized. In addition, a Nonlinear Static Analysis (NSA) is performed to investigate the capacity of structures against the PC phenomenon. Using OpenSees software, 10-, 15- and 20-storey structures with three distinct irregularity types are analysed during four different column removal scenarios. The results are presented in the form of static and dynamic nonlinear curves. The results indicate that making geometric irregularity in height in the sudden column removal scenario can cause the reduction of capacity and growth of the structural response in comparison to the structure with regularity in height. Moreover, the capacity of structures increases and the dynamic response declines by increasing the number of elements in the structures.

scholarly journals Study of the plastic-hinge analysis of 3D steel frames applying nonlinear static analysis

2020 ◽  
Vol 1 (3) ◽  
pp. 24-29
Author(s):  
Haitham Kannas ◽  
Abdallah M. S. Wafi
Keyword(s):  
Static Analysis ◽  
Residential Buildings ◽  
Plastic Hinge ◽  
Steel Frames ◽  
Research Paper ◽  
Nonlinear Static Analysis ◽  
Clear Picture ◽  
Length Increase ◽  
Nonlinear Static ◽  
Nonlinear Performance

This paper provides a distinct study on the performance of different residential buildings with different height and length spans under the influence of applied loads according to the Turkish standard TS498. The research paper presents the nonlinear performance of the buildings and provides a clear picture of the plastic and its stages throughout the construction. The study explains the effect of the various stages of plastic and how it affects the rigidity of the building. The results portray the building's stiffness values and how they change. The results show that stiffness increases with length-increase and decreases by decreasing the height of buildings. All stiffness values were calculated according to the first plastic hinge formation. Software used is ETABS 2018 and all calculations and parameters used according to FEMA356-2000, ASCE 7-16, ACI-318, EURO code 8, and Turkish standard.

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