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Aslam

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Transcript

  • 1. CALCULATE COLLAPSE LOAD ON THE BASIS OFMOMENT REDISTRIBUTION
  • 2. SCOPE
  • 3. FIXED ENDED BEAM SUBJECTED TO TWO POINT LOADING.FIXED ENDED BEAM SUBJECTED TO UNIFORMLY DISTRIBUTEDLOAD.TWO EQUALLY SPAN CONTINUOUS BEAM LOADED WITH APOINT LOAD AT MIDSPAN. .
  • 4. MOMENt REDIStRIBUtIONAS PER CODESBS CODEBritish code CP 110-1972 allows the peak elastic moments tobe reduced by up to (0.6-c/d)100% but not more than 30%.RUSSIAN CODE Russian regulations apparently have allowed the intermediatespans of uniformly loaded continuous beams of equal span tobe design for equal positive and negative moments and haveallow 30% moment redistribution from the elastic bendingmoment diagram.ACI CODEACI code allow support moments to be changed by up to 20%depending upon the ductility of section
  • 5. ASSUMED M- φ CURvE
  • 6. FACtORS AFFECtINg ON MOMENt REDIStRIBUtION Plastic hinge rotation Plastic hinge length
  • 7. APPlICAtION OF MOMENt REDIStRIBUtION Redistribution of negative moments in continuous nonprestressed flexural members Redistribution of negative moments in continuous prestressed flexural members
  • 8. MOMENt REDIStRIBUtION PROhIBItED slab systems designed by the Direct Design Method. The failure mechanism of FRP reinforced flexural members should not be based on the formation of plastic hinges.
  • 9. ASSUMPtIONS
  • 10. MAtlAB PROgRAM
  • 11. DEvElOPMENt OF M-FIlEMAIN PROGRAM CALCULATE COLLAPSE LOADSUB PROGRAM DRAW MOMENT CURVATURE DIAGRAM DRAW SHEAR FORCE AND BENDING MOMENT DIAGRAM
  • 12. CASES tO BE CONSIDERED Fixed ended beam loaded with two point loading. Fixed ended beam loaded with a uniformly distributed load Two equally span continuous beam loaded with a point load at mid span
  • 13. M – φ CURvE
  • 14. FIxED ENDED BEAM lOADED wIth twO POINtlOADINg .
  • 15. FIxED ENDED BEAM lOADED wIth UDl .
  • 16. twO EqUAlly SPAN CONtINUOUS BEAM lOADED wIth APOINt lOAD At MID SPAN
  • 17. COMPARAtIvE StUDy
  • 18. thE END