Komposiitkatte mõju raudbetoonkonstruktsiooni kaitsel.

Vapper, Meelis (2019) Komposiitkatte mõju raudbetoonkonstruktsiooni kaitsel. [thesis] [en] The Effects of Composite Coating for the Protection of Reinforced Concrete Structures..

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Abstract

Käesoleva lõputöö uurimisobjektiks oli komposiidiga kaetud raudbetoonkonstruktsioon ning eesmärk leida vastus küsimusele, kas komposiidist kattekiht omab tugevdavat mõju raudbetoonposti kaitsel plahvatusest tingitud mõjutuste vastu. Püstitatud hüpoteesi kontrollimiseks konstrueeriti 18 mudelkatsekeha mõõtudega 100x100x1000 mm, millest 9 armeeriti teraskiududega ning 9 armeeriti terasvarrastega. Terasvarrastega armeeritud ja teraskiududega armeeritud (4+4) katsekeha kaeti komposiitkattega. Lõhkamiskatsed viidi läbi paralleelselt komposiidist kattega ja katmata katsekehadega. Mõlemast armeeringuga katsekeha tüübist jäeti üks kahjustamata, võrdlusena algse survetugevuse määramiseks. Katsekehasid katsetati paari kaupa lihttaladena erinevate lõhkelaengute masside juures. Peale lõhkamiskatseid mõõdeti kahjustatud katsekehade jääksurvetugevus survepressi all. Katsetulemused näitasid, et komposiitkate omab positiivset mõju raudbetoonkonstruktsioonide kaitsel. Selgelt ilmnes nimetatud asjaolu teraskiuga armeeritud katsekehade juures, kus komposiidist katteta katsekehad purunesid lõhkamiskatsete käigus, kuid komposiitkattega katsekehad säilitasid osaliselt kandevõime ning terviklikkuse. Terasvarrastega armeeritud katsekehade puhul olid tulemused vähem selged. Täiendavalt uurimist vajab komposiitkatte mõju suure impulsiga toimuva löögi tagajärjel konstruktsiooni purunemisele. Oli täheldatav nakke kadu ja katte delamineerumist suurema lõhkeaine massi juures. Raudbetoonposti purunemispilt meenutab rohkem purunemist survele ja nihkele posti keskel, kui saleda varda nõtkumist. Lõplike järelduste tegemiseks on vajalik läbi viia täiendavaid katseseeriaid, et välistada võimalikud hälbed katsekehade konstrueerimisel ning katsetamisel.

Abstract [en]

This experimental study The Effects of Composite Coating for the Protection of Reinforced Concrete Structures investigated whether a structural composite coating can have a positive effect for protecting reinforced concrete structures against explosions. To test the hypothesis 18 model columns with measures 100x100x1000 mm were constructed from concrete. Half of them (nine) were reinforced with steel fibers and the ohter half with regulaar reinforcment bars ø = 8 mm. Four of the steel fiber reinforced columns and four steel bar reinforced columns were coated with glass fiber composite coating (GFCC). The columns were tested in pairs, one with coating and one without coating, as single span beams with varying masses of trinitrotoluene or TNT. The residual compressive strenght of the columns was measured after explosive testing. Explosions were Carried out on the 4th of April 2019 on the Estonian Defence Forces central polygon in Kuusalu, Harjumaa. The test results showed that GFCC can have a protective effect against explosions. The results were the clearest with steel fiber reinforced columns where columns with GFCC withstood the forces of explosion, but the columns without the coating broke and instantly lost their structural integrity. Testing of specimens with reinforcment bars gave less clear results compared to test results with steel fiber reinforcement. Glass fiber did not break during the testing but influenced how the specimens were damaged and broke during compression tests. Failure modes similar to compression and shear were observed instead of buckling. Further testing is needed to get clear results on how GFCC is affecting the specimens. In conclusion further testing with more test specimens is needed to get conclusive results and exclude possible deviations from constructing of test specimens and from testing.

Item Type: thesis
Advisor: Kaspar Lasn
Co-advisor: Roman Kostrõkin
Subjects: Construction > Building Construction > Structural Design > Reinforced Concrete Structures
Construction > Building Construction > Building Construction and Design > Building Materials
Divisions: Institute of Construction > Building Construction
Depositing User: Meelis Vapper
Date Deposited: 05 Jun 2019 06:56
Last Modified: 03 Dec 2020 10:00
URI: https://eprints.tktk.ee/id/eprint/4483

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