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Modeling parameters for predicting the fire-induced progressive collapse in steel framed buildings

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Resilient Cities and Structures 2023年第3期2卷 129-144页

作者： S.Venkatachari V.K.R.Kodur Department of Civil Engineering National Institute of Technology PuducherryKaraikalIndia Department of Civil and Environmental Engineering Michigan State University3546 Engineering BuildingEast LansingMIUSA

Fire is one of the extreme loading events that a building may experience during its service life and can have severe consequences on the safety of its occupants,first responders,and the *** framed buildings under severe fires can experience high levels of instability at a local or global level,which in turn can lead to the partial or progressive collapse of the ***,in current practice,fire resistance of structures is obtained without due consideration to a number of critical factors,and this is mainly due to the high level of complexity in undertaking advanced analysis of structures under fire *** paper presents a parametric study on a ten-story braced steel framed building subjected to fire exposure wherein six different parameters are evaluated:fire severity,fire spread,load paths,temperature-induced creep,local instability,and analysis *** from validated finite element models are utilized to evaluate the influence of the different parameters and recommend critical parameters to be incorporated in the *** show that the susceptibility of fire-induced progressive collapse significantly depends on the severity of the fire exposure scenario,including fire intensity,fire spread,and extent of ***,accounting for the full effects of transient creep in fire-induced progressive collapse analysis is needed to obtain conservative failure times under severe to very intense fire ***,results from the parametric study infer that the sectional classification of a steel section based on local instability can alter under fire exposure and this effect is more critical in steel columns located in the higher stories of the building;a nonslender column at ambient conditions can transform to a slender section at elevated *** can induce temperature-induced local instability in the column and lead to an early onset of instability at member and structural levels.

关键词： Design fire Fire spread High-temperature creep Local instability Load path System level analysis progressive collapse

A Two-step Approach to progressive collapse Analysis of Building Structures under Blast Loading

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Journal of Shanghai Jiaotong university(Science) 2009年第4期14卷 393-397页

作者：徐俊祥刘西拉 Department of Civil Engineering Shanghai Jiaotong University Shandong Electric Power Engineering Consulting Institute Co. Ltd.

Structural collapse under blast loads is a very complex process. For several decades, the engineering profession has considered some approaches to analyze the essential physics of collapse phenomena. Recently, the interest in this topic has risen to an apex since the collapse of the World Trade Center towers. A two-step analysis approach to capture the characteristics of structural collapse during explosions is proposed. A numerical example is presented to illustrate the performance of the presented approach.

关键词： explosion progressive collapse damage reinforced concrete structural robustness

Numerical Simulation for progressive collapse of Continuous Girder Bridge Subjected to Ship Impact

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Transactions of Tianjin University 2014年第4期20卷 250-256页

作者：田力黄飞 School of Civil Engineering Tianjin University School of Mechanical Aerospace and Civil Engineeringthe University of Manchester M13 9PLthe United Kingdom Key Laboratory of Coast Civil Structure Safety (Tianjin University) Ministry of Education

The three-stage simulation method based on LS-DYNA was introduced in this study to simulate the progressive collapse of a continuous girder bridge after a ship-bridge collision. The pile-soil dynamic interaction and the initial stress and deformation of the whole bridge before the collision were considered. By analyzing the damage, deformation, stress distribution and collapse process of the whole bridge, the results show that the displacement response of the cap beam lags behind the pile cap. The response order of the whole bridge's components depends on their distances from the collision region. The plastic deformation of soil around piles has a positive effect on delaying the further increase in the displacement of piles. The impacted pier's losing stability and its superstructure's excessive deformation are the main reasons leading to the progressive collapse of the continuous girder bridge.

关键词： numerical simulation progressive collapse ship-bridge collision continuous girder bridge pile-soil interaction

Numerical Analysis of Structural progressive collapse to Blast Loads

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Transactions of Tianjin University 2006年第B9期12卷 31-34页

作者： HAO Hong WU Chengqing LI Zhongxian ABDULLAH A K School of Civil and Resource Engineering University of Western Australia Australia School of Civil and Environmental Engineering University of Adelaide Australia School of Civil Engineering Tianjin University Tianjin 300072 China

After the progressive collapse of Ronan Point apartment in UK in 1968, intensive research effort had been spent on developing guidelines for design of new or strengthening the existing structures to prevent progressive collapse. However, only very few building design codes provide some rather general guidance, no detailed design requirement is given. progressive collapse of the Alfred P. Murrah Federal building in Oklahoma City and the World Trade Centre (WTC) sparked again tremendous research interest on progressive collapse of structures. Recently, US Department of Defence (DoD) and US General Service Administration (GSA) issued guidelines for structure progressive collapse analysis. These two guidelines are most commonly used, but their accuracy is not known. This paper presents numerical analysis of progressive collapse of an example frame structure to blast loads. The DoD and GSA procedures are also used to analyse the same example structure. Numerical results are compared and discussed. The accuracy and the applicability of the two design guidelines are evaluated.

关键词： progressive collapse blast loads damage mechanics numerical

progressive collapse Resistance Analysis of Secondary Shielding Installation Platform for A-type Tank

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Hydro Science & Marine Engineering 2020年第2期2卷 1-11页

作者： Qingfeng Wang Zhigang Miao Li Zhou School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang212003China

As a key supporting equipment for the construction of LNG carriers,the installation platform undertakes the support and guarantee of LNG carrier tank internal *** paper takes the secondary shielding installation platform of A-type tank as the object of study,the study firstly considers the semi-rigidity of the nodes and the material nonlinearity based on finite element software,and then the residual structure is calculated using static nonlinear method after single truss,two trusses and three trusses are invalid *** research results show that the truss with higher components importance coefficient has greater impact on the residual structure when the truss is invalid;After the 2 trusses of installation platform become invalid completely,the further progressive collapse will not occur;When A1-HJ,A2-HJ and A2-HJ are dismantled at the same time,it will lead to the local progressive damage,which can cause the collapse of large-scale *** research findings can support the design and use of the installation platform.

关键词： A-type tank Installation platform progressive collapse

progressive collapse resistance analysis for RC frame structure under accidental loading

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Progressive collapse resistance analysis for RC frame struct...

A Review on progressive collapse Designing Based on UFC Regulation

中国力学大会-2017暨庆祝中国力学学会成立60周年大会

作者： Lin Shu-chao Yang Bo Kong De-yang Liu Hui-yuan College of Civil Engineering Chongqing University

In collapse-resistant design of a structure under accidental action,the process of progressive collapse and failure mechanism has become an important and hot topic. In this paper,base on a RC frame structure,the complex solid finite element calculation model is established by using the nonlinear explicit dynamic finite element analysis software LS-DYNA’s birth and death element and large rotational displacement technology. With the field test data of external column removal,the progressive collapse process and mechanism of RC frame structure is studied under accidental action. The results show that the explicit dynamic analysis results are in good agreement with those obtained from field test,and the calculation model and parameters can well describe the mechanical properties of RC frame structure. At the same time,the improvement of frame structure progressive collapse resistance is discussed,and alternative load path of RC frame structure is reasonablely seeked through the load transfer path,deformation characteristics,failure mode analysis. So that will provide the theoretical basis and technical support for the RC frame structure design.

关键词： RC frame structure progressive collapse accidental loading collapse mechanism FEM simulation

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Journal of Building Material Science 2019年第2期1卷 9-15页

作者： Javad Delfian Akbar Hassanipour Islamic Azad University Dezful branchIran Jundi-Shapur university of Technology DezfulIran

progressive collapse is a relatively rare event which happens due to unusual loading on a structure that lacks adequate continuity,ductility and indeterminacy which causes local collapse in that structure and then extends it to other structural *** US department of defense published UFC4-023-03 regulation regarding the building design against progressive *** regulation,based on the ASCE 7-05 standard,introduces two general approaches to building design against progressive collapse,including direct design and indirect design *** this study,a variety of structural design methods for progressive collapse have been ***,their strengths and weaknesses have been *** general,the results of this study show that design based on alternative path(AP)method is more economical than other ***,application of AP method is much more commonly accepted by researchers and designers.

关键词： progressive collapse Alternative path method Specific local resistance

Analysis of the progressive collapse of Buildings underHigh Temperatures Using Successive ApproximationTechnique

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Journal of Civil Engineering and Architecture 2020年第1期14卷 46-60页

作者： Luciano Lins Vieira Luciano Mendes Bezerra Ramon Saleno Yure Rubim Costa Silva Welington Vital da Silva Emanuella Guntzel Barbosa Valdeir Francisco de Paula Department of Civil Engineering University of BrasíliaBrasíliaDF-70910-900Brazil Department of Civil Engineering CEUBBrasíliaDF-70790-075Brazil Federal Institute of Education Science and Technology of GoiásGoianiaGO-74055-110Brazil

This paper presents an investigation of the disproportionate collapse of multi-store steel buildings in a natural fire situation due to the progressive failure of their *** this purpose,it is intended to evaluate the effects of the redistribution of stress and vertical displacements of columns with the evolution of the temperature addressing,also,the impacts of the localized faults of these structural *** addition,another objective of this paper is the development of a practical analysis approach,which is called by successive *** a methodology,advanced computational techniques were developed to predict the structural behavior of the building as the temperature reduces the strength and stiffness of its structural *** the parametric study,the overall response of the building was investigated through fire simulations in many *** results showed that the phenomenon of redistribution of stresses that occur during the heating period is essentially due to the reduction in the modulus of elasticity of the *** addition,the study pointed out that the use of advanced computational techniques through the use of successive approximations technique is an excellent alternative to study the progressive collapse of buildings subject to high temperatures.

关键词： progressive collapse fire column.

Deep reinforcement learning-based critical element identification and demolition planning of frame structures

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Frontiers of Structural and Civil Engineering 2022年第11期16卷 1397-1414页

作者： Shaojun ZHU Makoto OHSAKI Kazuki HAYASHI Shaohan ZONG Xiaonong GUO College of Civil Engineering Tongji UniversityShanghai 200092China Department of Architecture and Architectural Engineering Kyoto UniversityKyoto 615-8540Japan Tongji Lvjian Co. Ltd.Shanghai 200092China

This paper proposes a framework for critical element identification and demolition planning of frame *** quantitative indices considering the severity of the ultimate collapse scenario are proposed using reinforcement learning and graph *** action is defined as removing an element,and the state is described by integrating the joint and element features into a comprehensive feature vector for each *** establishing the policy network,the agent outputs the Q value for each action after observing the *** numerical examples,it is confirmed that the trained agent can provide an accurate estimation of the Q values,and handle problems with different action spaces owing to utilization of graph ***,different behaviors can be learned by varying hyperparameters in the reward *** comparing the proposed method and the conventional sensitivity index-based methods,it is demonstrated that the computational cost is considerably reduced because the reinforcement learning model is trained ***,it is proved that the Q values produced by the reinforcement learning agent can make up for the deficiencies of existing indices,and can be directly used as the quantitative index for the decision-making for determining the most expected collapse scenario,i.e.,the sequence of element removals.

关键词： progressive collapse alternate load path demolition planning reinforcement learning graph embedding