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Design Consideration of In-filled Brick Wall on Its Performance in Steel and Concrete Structure, Based on The 2800 Irainian Standard

AfzaliFard, Ali | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44845 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Golafshani, Ali Akbar; Tabeshpour, Mohammad Reza
  7. Abstract:
  8. In mostbuildings,wallpanels andarchitecturalreasonsaremanufactured. Butbecause of thecomplexity ofthe issueandthe lack oflogicaland yetsimpleanalytical modelof thecombinedfillerpanels and its effectonthe structural behaviorlargelyaffectedcarefulconsiderationin analysisofbuildingstructuresbeneglected. This assumptionmay reducethe accuracy oftheestimation oflateral stiffness, strengthand ductilityofthestructureloading. Althoughthe2800 Iranian Standard stipulated that thewallsshouldbe consideredin loading and design but anywhere the code don’t talk about method, and details needs toshouldbe taken intoconsideration. Among theimportantissuestobe mentioned, effect of infills in creation of soft story, torsion, short column and interaction between frame and infill. In 2800 standard issues related tosoft story, torsion, and theshort column specified butifthese phenomenaarecausedby thefillingof thewall, method of consideration of this issues not stated. In Thisstudy attemptstoinvestigate the above phenomenainthestructurewithdifferent wallpatterns, andit’s positiveandnegative aspectsto be specified. Alsowill be discussedaboutmethods ofdesign and loading considerationsAccording to the2800 code. Thefirstchapteranalyzeswere carriedouton effect of infill in natural period of RC Structures andshownthatitiswrongto ignorethe effect of infills in initialstructural design and ifthe initialdesign waswrongand its effectbe ignoredincalculating, seismic design load fromequivalent staticmethodbe underestimate and not conservative value. In order to prevent soft story failure when there is a discontinuity in bracing or shear walls in a certain story, columns of that story must be designed for factored loads. Even though in the contest of 2800 code there is no notification to necessity of increasing the design loads in existence of discontinuity of masonry infill walls, based on experiences of structural response in past earthquakes even in the case of existence of discontinuity in masonry infill walls the columns of the story must be designed for factored loads. The question is that in this case how much the factor is? The main goal of this research is to investigate the appearance of soft story failure in first story in reinforced concrete structures with moment frame system and different arrangements of masonry infill walls in upper stories (in different bays and different thickness) and also suggesting a factor to strengthen the first story columns in order to prevent the soft story failure. We call this factor, the over strength factor. In next Chapter, investigatetheinteraction offrameandwallandcolumnshear forceimposedaccuratelymodeled. Andincreasingamounts ofshear forceapplied to thecolumnwasstudiedatdifferent pattern of walls. In Thefinalepisodeeffect of infill in steel frames has been investigated. Steel frames divided in two parts:steelmomentframesandbracedsteel frames. In thefirst parteffect ofinfillson increase of thestrengthandstiffnessofthebracedframe has been investigated and inthe second part ,the phenomenon ofsoft-story onsteelmoment framesystemistaken into consideration
  9. Keywords:
  10. Concrete Frame ; Masonry Infilled Walls ; Earthquake Code 2800 ; Vibration Period ; Soft Story Design ; Steel Frames ; Frame-Infill Interaction

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