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Title |
An Experimental Study on the Flexural Strength of Lap Spliced Ultra High Strength Fiber Reinforced Concrete Beams
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Authors |
배백일(Baek-Il Bae) ; 손동희(Dong-Hee, Son) ; 최현기(Hyun-Ki, Choi) ; 정형석(Hyung-Suk, Jung) ; 최창식(Chang-Sik, Choi) |
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DOI |
https://doi.org/10.11112/jksmi.2021.25.6.76 |
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Abstract |
This study examines the bending behavior of lap-spliced ultra-high-strength fiber-reinforced concrete members and evaluates the safety of the design codes for ultra-high-strength fiber-reinforced concrete structures. An experiment on a total of six beams was performed. The main variables were the fiber-inclusion and the lap-spliced length at the center of the beams. The steel fibers in a volume fraction of 2% were used, and the lap-splice lengths were determined to be 8db and 16db. As a result of the test, the specimens not reinforced with fiber lost abrupt load-bearing capacity at the lap region and did not experience yielding of the reinforcing bar. In the case of fiber-reinforced concrete, if a lap-splice length of 16db is secured, the yielding of the main reinforcing bar can be experienced, and appropriate flexural strength can be expressed. Based on the experimental results of this study, as a result of reviewing the lap-splice length calculation formulas of the current design standards and the ultra-high-strength concrete structural design recommendations, it was found that all of them were evaluated conservatively.
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