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Title |
Flexural Tests of Flexural Member with Welded Lap Splices of Non-Weldable Reinforcing Bars
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Authors |
김문길(Mun-Gil Kim) ; 천성철(Sung-Chul Chun) |
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DOI |
https://doi.org/10.4334/JKCI.2018.30.5.489 |
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Keywords |
용접겹침이음 ; 편심 ; 종방향균열 ; 횡보강철근 ; 사용하중상태 welded lap splice ; eccentricity ; longitudinal crack ; transverse reinforcement ; service load state |
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Abstract |
Flexural strength and cracking behavior of flexural members with welded lap splices of normal reinforcing bars were investigated. In AWS D1.4, because eccentricity between welded bars may cause detrimental cracks, only reinforcing bars with diameter of 19 mm or less are allowed for welded lap splices. Cracking behavior was observed for flexural members with 19, 25, and 32mm bars. The existence of transverse reinforcement was set as an additional variable to evaluate the possibility of constraining crack width. All specimens show typical flexural behavior regardless of bar diameter and splices. Welded splices of reinforcing bars without transverse reinforcement had cracks along the bars, but the crack width at the service load was smaller than 0.3 mm, which is the upper limit of the KCI code. In specimens having welded splices of D19 and D25 reinforcing bars with transverse reinforcement, there was no longitudinal crack observed, while D32 specimens had a 0.03 mm crack at the service load. Test results show that the longitudinal cracks along welded splices of reinforcing bars can be restrained by providing transverse reinforcement.
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