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    Experimental Study on the Performance of Lap-Spliced Steel Bars in Ultrahigh-Performance Concrete

    Source: Journal of Materials in Civil Engineering:;2024:;Volume ( 036 ):;issue: 001::page 04023519-1
    Author:
    Yongzhi Gong
    ,
    Ziqi Wang
    ,
    Bairong Huang
    ,
    Yingjie Shan
    DOI: 10.1061/JMCEE7.MTENG-16241
    Publisher: ASCE
    Abstract: Ultrahigh-performance concrete (UHPC) is a new cementitious composite material that exhibits a high bond strength with steel reinforcement. To investigate the splice performance levels of steel bars in UHPC, mutual pullout tests on lap-spliced specimens and direct central pullout tests on bond-anchorage specimens were conducted in this work. The main variables included loading mode, concrete cover, and steel bar position. The results showed that the splice strength of lap-spliced steel bars was approximately 0.76 times the bond strength of the anchored steel bar with the same bond length. The splice strengths of specimens under one-way repeated loading were lower than those under monotonic loading; increasing the splice length or concrete cover thickness reduced the weakening effect of one-way repeated loading on lap-spliced specimen performance. The concrete cover thickness showed a strong positive linear correlation with the splice strength in the range of 0.75db to 2.25db and played an important role in stopping crack development in the specimens. The splice strengths decreased when the loading steel bar was moved from the middle of the structure to the side. Based on the experimental results, formulas for the splice strength and critical splice length of lap-spliced steel bars in UHPC under monotonic loading and one-way repeated loading are suggested. Finally, an analytical model for the bond slip of lap-spliced steel bars is proposed, providing a good fit with the test results.
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      Experimental Study on the Performance of Lap-Spliced Steel Bars in Ultrahigh-Performance Concrete

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4297851
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    contributor authorYongzhi Gong
    contributor authorZiqi Wang
    contributor authorBairong Huang
    contributor authorYingjie Shan
    date accessioned2024-04-27T22:55:41Z
    date available2024-04-27T22:55:41Z
    date issued2024/01/01
    identifier other10.1061-JMCEE7.MTENG-16241.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4297851
    description abstractUltrahigh-performance concrete (UHPC) is a new cementitious composite material that exhibits a high bond strength with steel reinforcement. To investigate the splice performance levels of steel bars in UHPC, mutual pullout tests on lap-spliced specimens and direct central pullout tests on bond-anchorage specimens were conducted in this work. The main variables included loading mode, concrete cover, and steel bar position. The results showed that the splice strength of lap-spliced steel bars was approximately 0.76 times the bond strength of the anchored steel bar with the same bond length. The splice strengths of specimens under one-way repeated loading were lower than those under monotonic loading; increasing the splice length or concrete cover thickness reduced the weakening effect of one-way repeated loading on lap-spliced specimen performance. The concrete cover thickness showed a strong positive linear correlation with the splice strength in the range of 0.75db to 2.25db and played an important role in stopping crack development in the specimens. The splice strengths decreased when the loading steel bar was moved from the middle of the structure to the side. Based on the experimental results, formulas for the splice strength and critical splice length of lap-spliced steel bars in UHPC under monotonic loading and one-way repeated loading are suggested. Finally, an analytical model for the bond slip of lap-spliced steel bars is proposed, providing a good fit with the test results.
    publisherASCE
    titleExperimental Study on the Performance of Lap-Spliced Steel Bars in Ultrahigh-Performance Concrete
    typeJournal Article
    journal volume36
    journal issue1
    journal titleJournal of Materials in Civil Engineering
    identifier doi10.1061/JMCEE7.MTENG-16241
    journal fristpage04023519-1
    journal lastpage04023519-12
    page12
    treeJournal of Materials in Civil Engineering:;2024:;Volume ( 036 ):;issue: 001
    contenttypeFulltext
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