scholarly journals Experimental Study on Progressive Collapse Performance of Frame with Specially Shaped Columns Subjected to Middle Column Removal

2016 ◽  
Vol 2016 ◽  
pp. 1-13 ◽  
Author(s):  
Tiecheng Wang ◽  
Qingwei Chen ◽  
Hailong Zhao ◽  
Lei Zhang
Keyword(s):  
Progressive Collapse ◽  
Vertical Displacement ◽  
Internal Force ◽  
Reinforced Concrete Frame ◽  
Concentrated Load ◽  
Concrete Frame ◽  
Gravity Load ◽  
Column Removal ◽  
Arch Action ◽  
Middle Column

A static collapse experiment was carried out to study the progressive collapse resistance and failure mechanisms and modes of a 1/3-scale,2×3-bay, and 2-story reinforced concrete frame with specially shaped columns subjected to middle column removal. A vertical concentrated load was applied to the top of the middle column to simulate the gravity load of the upper floors and the applied load was statically transmitted to the adjacent columns through the frame beams and slabs during the collapse process. The frame collapsed when the vertical displacement of the joint on the top of the failed column reached 170 mm due to the failure of beam-column joints. Based on the experimental phenomena and results, the progressive collapse-resistant behavior of the model frame is analyzed and the redistribution and transition of the load resisting mechanisms are discussed. It is concluded that the redistribution of internal force was mainly realized via the beam resisting mechanism and the compressive arch action in beams played an important role to improve the collapse-resistant capacity.

Research on the Collapse Performance of RC Frame Structure

2014 ◽  
Vol 556-562 ◽  
pp. 712-715
Author(s):  
Jing Zhao ◽  
Jing Zhao ◽  
Xing Wang Liu
Keyword(s):  
Reinforced Concrete ◽  
Frame Structure ◽  
Rc Frame ◽  
Hydraulic Actuator ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
Load Paths ◽  
Rc Frame Structure ◽  
Gravity Load ◽  
Middle Column

In collapse-resistant design of a structure under accidental local action, it is important to understand the failure mechanism and alternative load paths. In this paper, a pseudo-static experimental method is proposed. Based on which, the collapse of frame structure was simulated with testing a 1/3 scale; 4-bay and 3-story plane reinforced concrete frame. In the experience, the middle column of the bottom floor was replaced by mechanical jacks to simulate its failure, and the simulated superstructure’s gravity load acted on the column of the top floor by adopting a servo-hydraulic actuator with force –controlled mode.

Robustness of Reinforced Concrete Framed Buildings: A Comparison between Different Numerical Models

2016 ◽  
Vol 711 ◽  
pp. 814-821 ◽  
Author(s):  
Gabriele Bertagnoli ◽  
Diego Gino ◽  
Luca Giordano ◽  
Dario La Mazza ◽  
Giuseppe Mancini
Keyword(s):  
Reinforced Concrete ◽  
Human Error ◽  
Computational Study ◽  
Numerical Models ◽  
Progressive Collapse ◽  
Vertical Displacement ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
Frame Building ◽  
Scale Test

According to Eurocode, robustness is the ability of a structure to withstand events like fire, explosions, impact or the consequences of human error, without being damaged to an extent disproportionate to the original cause.Avoiding the progressive collapse of a building in presence of accidental loading conditions is one of the challenges for the designers.The tie-force method is actually one of the most used design techniques for resisting progressive collapse, whereby a statically indeterminate structure is designed with reference to local simplified models determined in accordance to the failure mode considered.In this work a computational study of a reinforced concrete frame is presented. The beam-column assembly represents a portion of the structural framing system of a ten-story reinforced concrete frame building and is subjected to monotonically increasing vertical displacement of the center column to simulate a column removal scenario.Two different finite element models, with distinct levels of modeling, are used in order to compare the numerical results with the experimental ones coming from a full-scale test, and evaluate the ability of the models to simulate the structural behavior of the frame.

scholarly journals Analysis on Dynamic Response of Reinforced Concrete Frame for Resisting Progressive Collapse

2016 ◽  
Vol 10 (1) ◽  
pp. 27-38 ◽  
Author(s):  
Tiecheng Wang ◽  
Lei Zhang ◽  
Hailong Zhao ◽  
Qingwei Chen
Keyword(s):  
Reinforced Concrete ◽  
Dynamic Response ◽  
Progressive Collapse ◽  
Internal Force ◽  
Reinforced Concrete Frame ◽  
Plastic Hinges ◽  
Concrete Frame ◽  
Weak Beam ◽  
Alternate Path Method ◽  
Column Element

In order to investigate the dynamic response of reinforced concrete spatial frames caused by initial damages, a six-story frame model is analyzed by employing the nonlinear dynamic methodology in accordance with the alternate path method issued by General Services Administration. In this paper, the fiber model and force-based beam-column element are utilized in OpenSees. Four various scenarios are separately analyzed with incremental dynamic analysis. It is shown that the model does not collapse and the internal force redistribution mainly appears in the components adjacent to the failure column. The model has the worst capacity to resist progressive collapse in the inner column demolition scenario. It is observed that the plastic hinges mainly concentrate on the beam ends of the failure bay at the beginning of the demolition of columns. Several plastic hinges emerge at the top-floor beam ends of some other bays in latter period. The number of plastic hinges in columns is much less than that in beams, which corresponds to the design principle ‘strong column and weak beam’.

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.

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.

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.

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