Effect of progressive collapse of central column on the push-down response of two-span beam-column substructures

2021 ◽  
Vol 248 ◽  
pp. 113119
Author(s):  
Giuseppe Campione
Keyword(s):  
Progressive Collapse ◽  
Central Column ◽  
Push Down

Push-Down Analysis of RC Frame Structure with Damaged Column

2012 ◽  
Vol 204-208 ◽  
pp. 1286-1289
Author(s):  
Soo Yeon Seo ◽  
Jeong Hun Kim ◽  
Jae Yeong Yeon ◽  
Hyung Joo Park ◽  
Ki Bong Choi
Keyword(s):  
Progressive Collapse ◽  
Frame Structure ◽  
Flexural Behavior ◽  
Rc Frame ◽  
Structural Element ◽  
Frame Building ◽  
Rc Frame Structure ◽  
Push Down ◽  
Rc Frame Building ◽  
Sectional Analysis

In this study, a push down analysis was performed for reinforced concrete (RC) frame building with collapsed column at lower floor by shock due to abnormal load in order to find progressive collapse process of building. The nonlinear flexural behavior of each structural element was defined from sectional analysis by using X-tract program. For push-down analysis of frame structure, Zeus-NL program was used. Main parameters in the analysis are location of damaged column and story of building. As a result, the deflection at the time of collapse of internal column was lower than one at the time of collapse of external column. In the frame structure with severely damaged column at lower floor, the higher the story was, the smaller the change of moment in beams at upper floors was. And, deflections of beams were found to appear evenly. This can be judged to be caused by a beam's suspension action.

scholarly journals Effect of Steel Bracing in Progressive Collapse of Multi Storey RC Buildings

2019 ◽  
Vol 8 (4) ◽  
pp. 3916-3921
Keyword(s):  
Terrorist Attack ◽  
Progressive Collapse ◽  
Plastic Hinge ◽  
Structural Instability ◽  
Mode Shapes ◽  
Structural Element ◽  
Steel Bracing ◽  
Column Removal ◽  
Push Down ◽  
General Service

Rapid increase in manmade and natural disasters can lead to structural instability which triggers the partial or complete collapse of the building. These manmade disasters include gas cylinder explosion or terrorist attack or instant removal of the primary structural element which leads to the progressive collapse of the building. To avoid the progressive collapse of building due to man-made disasters, incorporate the mechanism which resists the man-made disaster while the design for existing or newly constructing building. In this paper, an attempt is made to understand the effect of with and without providing steel bracing at various positions column removal in multi-storey building one at a time as per General Service Administration and Unified facilities criteria codes. The propagation of progressive collapse with and without the effect of steel bracing is studied in this paper. A seven-storey RC building is modelled and analysed for various column removal scenarios in SAP 2000 software. The Loads are applied according to General Service administration and Unified facilities criteria guidelines, column removal positions namely centre, edge and corner column removal at ground floor are also considered from guidelines. The three scenarios are then analysed individually as a bare frame, bare frame with steel bracing in the wall and bare frame with steel bracing in the slab. Push down analysis is carried out on models and results of mode shapes, time periods, force Vs displacement curves, plastic hinge deformation are discussed. From results, it is observed that wall bracings have better performance in all three and can help in arresting the progressive collapse from spreading throughout the building.

scholarly journals Modeling damaged precast structural system when its robustness check

2021 ◽  
pp. 63-81
Author(s):  
Viktar TUR ◽  
Andrei TUR ◽  
Aliaksandr LIZAHUB
Keyword(s):  
Progressive Collapse ◽  
Precast Concrete ◽  
Experimental Studies ◽  
Resistance Mechanisms ◽  
Calculation Model ◽  
Dynamic Resistance ◽  
Building Structures ◽  
Structural System ◽  
Non Linear ◽  
Central Column

Within the framework of traditional approaches to checking for resistance of reinforced concrete buildings and structures to the progressive collapse development, membrane (chain) forces in a damaged structural system are calculated separately, without considering its non-linear bending behavior during the formation of the plastic hinges and without checking the possibility of achieving large deflections.The authors propose an approach to modelling a nonlinear quasi-static reaction of a damaged structural system in an accidental design situation. This approach considers non-linear bending and the resistance of reserved horizontal ties, considering their ultimate ductility. The authors verified the proposed approach based on the results of experimental studies by others researchers.An example of the application of the proposed approach in assessing the robustness of a structural system made of precast concrete with a sudden removal of the central column is considered. In accordance with the provisions of the energy approach, an analysis is made of the contribution of individual resistance mechanisms to the total quasi-static and dynamic resistance of the damaged structural system.We show that the proposed calculation model adequately describes the behavior of a damaged structural system in an accidental design situation, and therefore to carry out parametric studies and check the robustness of building structures.

INCREASING ROBUSTNESS OF REINFORCED CONCRETE STRUCTURES UNDER COLUMN LOSS SCENARIO

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Said Elkholy ◽  
Bilal El-Ariss
Keyword(s):  
Reinforced Concrete ◽  
Simple Technique ◽  
Progressive Collapse ◽  
Element Analysis ◽  
Catenary Action ◽  
Rc Frames ◽  
Plane Frames ◽  
Nonlinear Static ◽  
Steel Cables ◽  
Push Down

This paper presents a simple technique to enhance robustness of reinforced concrete (RC) plane frames to progressive collapse under column loss scenario. The response of the enhanced/mitigated RC frames is analyzed using fiber force-based finite element analysis and applying displacement-controlled nonlinear static pushdown at the location of failed column. The technique involves addition of external unbounded steel cables to the continuous beam in each floor at anchorage and deviator locations. The cables transfer the loads above the failed column to the anchorages and deviators that are assumed to perform as rigid arms, which in turn redistribute the loads to adjacent columns. The numerical model computes the frame progressive collapse robustness using push-down analysis to simulate a column elimination and estimate the effects of cable catenary action on the frame. Two-dimensional RC frame of six stories and four bays was adopted in the study. The numerical results demonstrate the prospect of increasing robustness of RC frames to progressive collapse using presented technique.

Protection of buildings and structures against progressive collapse within the framework of legislative and regulatory requirements

2019 ◽  
pp. 46-54 ◽  
Keyword(s):  
Progressive Collapse ◽  
Professional Community ◽  
Regulatory Requirements ◽  
Technical Regulation ◽  
Regulatory Documents ◽  
Common Position ◽  
Local Destruction

At present, the current legislative and regulatory documents do not contain a clear and unambiguous answer to the question, what buildings and structures should be designed resistant to progressive collapse. In this regard, the analysis of the legal and regulatory requirements of the need for calculations to prevent the progressive collapse of buildings and structures due to hypothetical or suspected local destruction is presented. The main legislative requirements of technical regulation in the field of ensuring the mechanical safety of buildings and structures, as well as the requirements of regulatory documents regarding the design of the protection of building and structures against progressive collapse are considered. The analysis of the fundamental principles features of the calculation for the structural protection against progressive collapse is given. Some issues discussed by the professional community in the direction of possible ways of solving the actual problems of the presented problem are considered. The conclusion is made about the need for further dialogue of the professional community on the development of a common position on the protection of buildings and structures from progressive collapse, which should be reflected in the legislative and regulatory requirements.

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