Numerical Analysis for Progressive Collapse of a Multi-Storey Building due to an Explosion in its Basement

2011 ◽  
Vol 250-253 ◽  
pp. 3115-3119 ◽  
Author(s):  
Li Tian ◽  
Hao Wang
Keyword(s):  
Numerical Analysis ◽  
Progressive Collapse ◽  
Simulation Method ◽  
Structural Members ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
Whole Process ◽  
Main Work ◽  
Storey Building

A numerical analysis for the progressive collapse of a reinforced concrete frame caused by an explosion in this structure’s basement is presented in this paper. The whole process from the detonation of the explosive charge to the complete demolition is reproduced. The main work is focused on the role of soil in structural collapse and failure mode of structural members. The analysis is simulated using ANSYS/LS-DYNA and proposes a new simulation method which is comparatively accurate and economic.

Performance of Different Seismic Retrofitting Techniques in Case of Blast-Induced Progressive Collapse

2011 ◽  
Vol 82 ◽  
pp. 485-490 ◽  
Author(s):  
Domenico Asprone ◽  
Fatemeh Jalayer ◽  
Andrea Prota ◽  
Gaetano Manfredi
Keyword(s):  
Probabilistic Analysis ◽  
Critical Infrastructure ◽  
Progressive Collapse ◽  
Life Time ◽  
Simulation Method ◽  
Seismic Retrofitting ◽  
Frame Structure ◽  
Reinforced Concrete Frame ◽  
Component Level ◽  
Concrete Frame

Extreme loading conditions such as man-made malicious actions, fires or natural events could induce local failure mechanisms (e.g., a loss of a member) which may trigger progressive collapse. The design or the assessment of a critical infrastructure needs to address the possibility of such an extreme circumstance taking place during its effective life-time. It is observed that blast-induced progressive collapse mechanisms involve non-linear structural behavior similar to that due to earthquakes. This work focuses on probabilistic analysis of progressive collapse of a typical RC structure, induced by a blast event. The objective is to verify the effectiveness of seismic retrofitting schemes against explosions and the eventual progressive collapse. The probabilistic analysis is performed by taking into account the uncertainties in loading such as planar configuration and amplitude of the blast loading. A standard Monte Carlo simulation method is employed to generate various realizations of the uncertain parameters within the problem. For a given realization, various component-level dynamic analyses are preformed within a certain range of distance, in order to quantify and locate the damage induced by shock wave on structural elements. As a case study, a 5-storey reinforced concrete frame structure designed for gravity loading only is considered. As possible retrofitting schemes, steel bracing, FRP wrapping and RC jacketing are compared. The probability of collapse considering both blast and earthquake for the structure before and after retrofit are compared.

Progressive Collapse Simulation of Underground Structure under Internal Blast Loading

2011 ◽  
Vol 90-93 ◽  
pp. 3097-3101
Author(s):  
Li Tian ◽  
Mei Hua Zeng
Keyword(s):  
Progressive Collapse ◽  
Underground Structure ◽  
Blast Loading ◽  
Simulation Method ◽  
Underground Structures ◽  
Load Path ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
Free Air ◽  
Internal Blast Loading

Much research has been directed at the progressive collapse of the over-ground structures under free air burst loading in recent years, while less work has been stressed on the progressive collapse of the underground structures, which subjected to internal blast loading. A proposed method is presented in this paper to simulate the progressive collapse of one underground reinforced concrete frame under internal blast loading, which is using LS-DYNA. The numerical results indicate that the proposed method is more accurate and timesaving, compared with alternative load path method (ALPM) and direct simulation method (DSM).

Resistance of Reinforced Concrete Frames with Masonry Infill Walls to In-Plane Vertical Loading

2016 ◽  
Vol 711 ◽  
pp. 982-988
Author(s):  
Alex Brodsky ◽  
David Z. Yankelevsky
Keyword(s):  
Reinforced Concrete ◽  
Failure Modes ◽  
Progressive Collapse ◽  
Lateral Loading ◽  
Masonry Walls ◽  
Reinforced Concrete Frame ◽  
Masonry Infill ◽  
Concrete Frame ◽  
Vertical Loading ◽  
Infill Masonry

Numerous studies have been conducted on the in plane behavior of masonry infill walls to lateral loading simulating earthquake action on buildings. The present study is focused on a problem that has almost not been studied regarding the vertical (opposed to lateral) in-plane action on these walls. This may be of concern when a supporting column of a multi-storey reinforced concrete frame with infill masonry walls undergoes a severe damage due to an extreme loading such as a strong earthquake, car impact or military or terror action in proximity to the column. The loss of the supporting column may cause a fully or partly progressive collapse to a bare reinforced concrete frame, without infill masonry walls. The presence of the infill masonry walls may restrain the process and prevent the development of a progressive collapse. The aim of the present study is to test the in-plane composite action of Reinforced Concrete (RC) frames with infill masonry walls under vertical loading through laboratory experiments and evaluate the contributions of infill masonry walls, in an attempt to examine the infill masonry wall added resistance to the bare frame under these circumstances. Preliminary results of laboratory tests that have been conducted on reinforced concrete infilled frames without a support at their end, under monotonic vertical loading along that column axis will be presented. The observed damages and failure modes under vertical loading are clearly different from the already known failure modes observed in the case of lateral loading.

Using of Plastic Hinges in the Calculation of Buildings against Progressive Collapse under Fire Exposure

2018 ◽  
Vol 878 ◽  
pp. 115-120
Author(s):  
Levon Avetisyan
Keyword(s):  
Reinforced Concrete ◽  
Progressive Collapse ◽  
Experimental Studies ◽  
Fire Exposure ◽  
Reinforced Concrete Frame ◽  
Dynamic Calculation ◽  
Plastic Hinges ◽  
Concrete Frame ◽  
In Fire ◽  
Concrete Elements

This article presents a study of the strength of a 25-storey reinforced concrete frame against progressive collapse in fire conditions. Taking into account the angles of disclosure of plastic hinges as norming for the strength of reinforced concrete elements, a computer technology program has been developed and included in PR Wolfram Mathematica 10 for the dynamic calculation of compressed reinforced concrete elements under fire exposure on the basis of the conducted experimental studies. Dynamic calculation of the strength of eccentrically compressed reinforced concrete columns was carried out, with operation in normal conditions and under high temperatures. The diagram «moment-curvature» and the graph of the change of the static and dynamic strength of the column depending on the temperature were developed. Nonlinear dynamic analysis of a 25-storey reinforced concrete frame was conducted, taking into account the changes of the dynamic characteristics of reinforced concrete elements in fire and, the estimation of resistance of the frame was given.

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