COMPARISON OF CALCULATIONS OF THE SECTION AREA OF LONGITUDINAL REINFORCEMENT IN BENDING ELEMENTS OF THE BRAND PROFILE
DOI:
https://doi.org/10.31713/budres.v0i39.014Abstract
Reinforcedconcretebendingelementsofthe T-profilearewidelyusedinbuildingsandstructures. Inconnectionwiththeintroductionofnewbuildingcodesthereis a needtodevelopmodernmethodsforcalculatingsuchelementsbasedonthedeformationmodel.Thedevelopersofcurrentregulationsproposedtocalculatethebendingelementsbasedonthedeformationmodelusing a completeorsimplifieddiagramofconcretedeformation. Thetaskistocalculatethe cross-sectionalareaofthelongitudinalworkingreinforcementintheelementof T-sectionaccordingtothenewstandardsandtocomparetheresultsofthecalculationwiththoseobtainedunderthepreviousnormativedocument.Todeterminethepositionoftheneutralline, wefindthebearingcapacityofthecrosssectionoftheelement, providedthattheneutrallinepassesattheboundaryoftheshelfandthewall (edge) ofthecrosssectionofthe T-shapedelement. Thebearingcapacityisdefinedasthesumofthemomentsofinternalforcesinthecompressedshelfandstretchedreinforcement, relativetotheneutralline.Bythemethodofsuccessiveapproximationswefindthevalueoftheheightofthecompressedzoneofconcrete, atwhichtheratioofthemomentfromtheinternalforcesincrosssectiontothebendingmomentfromtheexternaldesignloadwillbeascloseaspossibletounity.Theobtainedresultsofcalculationsandthemagnitudeofthediscrepancywiththeresultsoftherepealednormsindicatetheacceptabilityofbothmethods, theadvantageoftheabolishedmethod - greatersimplicity, especiallywhenusingmanualcalculations, theadvantageofthenewmethod - versatilityineliminatingempiricalutensiltechnology.
