Gsa progressive collapse design guidelines applied to. Progressive collapse analysis by applied science international using its extreme loading for structures 3d nonlinear dynamic structural analysis software. Asis extreme loading for structures els software is the ideal fully nonlinear structural analysis tool to study the behavior of steel, reinforced concrete, and masonry structures against corrosion, seismic, wind, progressive collapse, and blast. The previous guidelines, progressive collapse analysis and design for new federal. Els is a powerful structural analysis software that provides structural engineers with more through, performancebased approach to progressive collapse that is not only cost effective but will provide building owners and builders savings in time and construction materials. An overview of progressive collapse, including a discussion on when a progressive collapse analysis is required, can be found in this video clip below.
Extreme loading for structures els software allows structural engineers to accurately model, analyze, and visualize progressive disproportionate collapse resulting from extreme loading conditions including. Throughout this paper, progressive collapse of steel structure with dual system considering the removing column scenario is studied. From the initial design phase of offshore structures to subsequent modifications and life extension, structural engineers must keep the possibility of accidents in the back of their minds. Moreover, the steel mesh reinforcement at top layer of slabs plays a significant role in resisting progressive collapse of reinforced concrete structures, which should be considered in design to.
Gsa alternate path analysis and design guidelines for progressive collapse resistance october 24, 20 page 1 of 50 1 introduction 1. The latest code to provide design provisions for progressive collapse is the department of defenses dod unified facilities criteria ufc 402303 guidelines for design of buildings to resist progressive collapse. One test is on progressivecollapse simulation software created by durham, n. Progressive collapse analysis software pushover analysis. The live load for the analysis is taken as 25% of design live load.
From the initial design phase of offshore structures to subsequent modifications and life extension, structural engineers must keep the possibility. Finally, commerciallyavailable structural design software, such as sap2000 and etabs, are oftenused to design for progressive collapse, following the applicable design requirements such as ufc 402303. Modeling and simulation of the structure with the necessary structural and nonstructural components. Progressive collapse analysis software pushover analysis software. One of the structural engineering services that asi offers is progressive collapse analysis aka.
Different structural systems exhibit different degrees of susceptibility to progressive collapse and such differences are neglected in modern design procedures based on reliability. Structural design structural analysis software light. Create a model model a which contains the entire structure, including the column to be removed. Software for progressive collapse analysis per ufc 4023. This paper considers the development and implementation of design requirements for progressive collapse mitigation in the current building regulatory climate, and the prospects of developing load and resistance factor criteria for progressive collapse design. Ufc 402303 design of buildings to resist progressive. This unified facilities criteria ufc provides the design requirements necessary to reduce the potential of progressive collapse for new and existing facilities that experience localized structural damage through normally unforeseeable events. This research focuses on identifying the effect of seismic design level on resisting progressive collapse. Concrete building structures whether, insitu or precast, are required to perform in the event of accidental damage or explosion by meeting the design criteria set out in bs8110 for progressive collapse. What are the programs that can do a progressive collapse analysis. Capacity assessment of the structural progressive collapse and progressive collapse design are based on structural progressive collapse analysis, analysis methods include linear static, nonlinear static, linear dynamic and nonlinear dynamic. The progressive collapse potential is assessed with the help of demandcapacity ratio of structural members. Structural analysis and design to prevent disproportionate.
We specialize in structural design software for light steel framing cold formed steel and structural analysis software for blast, progressive collapse, seismic, and wind. When designing new assets, they need to consider accidental scenarios and prove the structural integrity with progressive collapse analysis software. Progressive collapse assessment of reinforced concrete. A building undergoes progressive collapse when a primary structural element fails, resulting in the failure of adjoining structural elements, which in turn causes further structural failure. Nonlinear static analysis is performed to understand the progressive collapse phenomena. Definitions, with descriptions of the key terms and structural analysis concepts.
Blast and progressive collapse blast and progressive collapse. How to do a progressive collapse analysis in buildings. Engineers can also determine a structures vulnerability to. Due to this objective, two lateral load resisting systems, are. Progressive collapse of framed building structures. Our proprietary extreme loading technology elt uses the applied element methodto accurately analyze the behavior of structures under extreme loads and to assess the risk of progressive collapse. Progressive collapse analysis and design guidelines. There is a real need to complementary use the finding in each field. Checking the structure against the requirements of relevant progressive collapse codes such as gsa progressive collapse guidelines and the ufc progressive collapse design requirements.
Progressive collapse analysis when is it required for a. Progressive collapse design using sap staged construction. Progressive collapse disproportionate collapse applied. Finally, commercially available structural design progressive collapse design of buildings continues to be an active software, such as sap2000 and etabs, are. Due to time and budget constraints structural engineers performing traditional design for blast, progressive collapse, and impact have been limited by prescriptive code requirements and design tools to that look at simplified structural components. A flowchart was presented to indicate when progressive collapse analysis is required based on project type, building height, and federal security level. The nonlinear static analysis is found to be the most efficient method for progressive collapse assessment of the reinforced concrete structure with consideration of soil effect. Ufc 402303 design of buildings to resist progressive collapse with change 2 07. Pradeep a r building description for the analysis, a typical frame of height 37. Within the building structure, ties are incorporated to resist calculated forces determined by a variety of factors. Ironically, engineers disagree on the definition of this phenomenon, and many argue that the factors surrounding the 2001 terrorists attacks were too extraordinary to classify the twin towers failure as progressive collapse. Finally, commerciallyavailable structural design software, such as sap2000 and etabs, are oftenused to design for progressive collapse, following the.
Progressive collapses may be accidental, due to design deficiencies or errors. Revision of the levels of progressive collapse design, including the option to use the alternate path method in. Progressive collapse may be modeled using sap2000 or etabs in the sense that certain members may be removed to study the effect on the structure. Ufc 402303 offers guidelines for multiple design methods. Furthermore, utilizing this seismic resistance and added ductility saves when designing for progressive collapse. Progressive collapse design of buildings continues to be an active area of research and development. Pdf progressive collapse criteria and design approaches. Engineers can also determine a structures vulnerability to progressive collapse by creating multiple event scenarios which will simulate the failure of different. Load and resistance factor criteria for progressive. Comparison of the design loads u1 and u2 leads to the conclusion that the basic design load for a column under gravity design exceeds the design load under progressive collapse by well over 25%. How is a progressivecollapse analysis performed in which a column is removed to evaluate dynamic response. Concrete buildings and progressive collapse resistance buildings progressive collapse is defined as a situation where local failure of a primary structural components leads to the collapse of adjoining members, which in turn leads to additional collapse. They asserted that although it was possible to design a building to resist.
Loading for structures software for progressive collapse design on. M any government agenciesand some private building owners today require that new buildings be designed and existing buildings upgraded to resist the effects of potential blasts. Els is a powerful structural analysis software that provides structural. Progressive collapse is the result of a localized failure of one or two structural elements that lead to a steady progression of load transfer that exceeds the capacity of other surrounding elements, thus initiating the progression that leads to a total or partial collapse of the structure. Progressive collapse analysis of reinforced concrete frame. Analytical tools for progressive collapse analysis robert smilowitz weidlinger associates. Progressive collapse of structures uwe starossek on. Taken from the book advanced modelling techniques in structural design. Blast and progressive collapse american institute of. In ufc 402303 documentation, it cited either sap or other comparable software as a tool to perform necessary alternate path analysis for progressive collapse design.
Progressive collapse is a situation in which a localized failure in a structure, caused by an abnormal load, triggers a cascade of failure affecting a major portion of the structure. A list of the design software used to perform the progressive collapse mitigation. Design of blast resistance structures, provides more detailed analysis and design recommendations. For high potential against progressive collapse, demandcapacity ratio should be greater than 2 for typical buildings. In this paper, progressive collapse analysis method in gsa collapse resistance design guideline was first introduced. Progressive collapse and dynamic effects may be evaluated using timehistory analysis as follows.
Progressive collapse software extreme loading for structures. Ellingwood 2002 studied on load resistance factor criteria for progressive collapse. Progressive collapse analysis of low rise steel frame. Nonlinear analysis on progressive collapse of tall steel composite. Committee isc security criteria regarding progressive collapse. Asi offers structural engineering software to solve a variety of design and analysis challenges. Progressive collapse a complete design, build and erect. Diagnosing the survivability of buildings in relation to software, planners at the design stage detail its. Software for progressive collapse analysis per ufc 402303 agent666 structural 23 jul 18 18. Gsa progressive collapse design guidelines applied to concrete momentresisting frame buildings david n. Because buildings of three or more stories are subject to greater risk of progressive collapse, all buildings of three or more stories must comply with these standards, regardless of the standoff distance provided. Parametric analysis of progressive collapse in highrise.
Pdf progressive collapse of reinforced concrete structures. Design of steel structures for blastrelated progressive. Static analysis is used to analyze the structure software etabs v9. Not only is the topic important in terms of protecting building occupants but it is also an intellectuallyengaging issue, with a wide spectrum of views, ranging from those who feel progressive collapse design is not needed to those who have an obligation to protect the public. Several buildings have collapsed in this fashion in recent years, and the possibility of progressive collapse is a source of continuing concern. Els can be used to satisfy requirements for ufc 402303 design of buildings to resist progressive collapse.
The destruction of the world trade center towers has heightened concern about the progressive collapse of buildings. Progressive collapse of structures ice virtual library. Pdf the study of progressive collapse in dual systems. Progressive collapse analysis of reinforced concrete framed structure raghavendra c, mr. The progressive collapse of the south tower of the world trade center occurred after 55 minutes and 51 seconds, at 9 hours and 58 minutes, and at the north tower after 1 hour and 41 minutes and 51 seconds, at 10 hours and 28 minutes. Investigating the behavior of a w14x233 column of astm a992, gr. Investigative methods and design strategies for creating collapseresistant structures are presented and compared. Progressive collapse is the result of a localized failure of one or two structural. Extreme loading modeler predicts progressive collapse. Reconcile between seismic design and progressive collapse design.
In indirect design, the structures are designed implicitly to resist progressive. Protective design, blast design, and progressive collapse. The progressive collapse of a structure is characterized by a disproportion between a comparatively minor event or local failure and the ensuing widespread collapse. Design of steel structures for blastrelated progressive collapse resistance by ronald hamburger, s. In conclusion, the gravity design of columns provides adequate reserve of strength to share the load from failure of an adjacent column. Progressive collapse analysis performed with extreme. Progressive collapse analysis of a typical rc highrise. Progressive collapse analysis software damages caused by explosions, fires, dropped objects, earthquakes and ship impacts can pose a major threat to the safety and operation of offshore structures. Ufc 402303 design of buildings to resist progressive collapse. The procedures presented herein are required for the treatment of progressive collapse for u. British adopted explicit progressive collapse design measures into their building code. Progressive collapse analysis technical knowledge base. Progressive collapse analysis performed with extreme loading.