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    Development and Performance of Innovative Steel Wedge Block–Crossed Inclined Stud–UHPC Connections for Composite Bridge

    Source: Journal of Structural Engineering:;2022:;Volume ( 148 ):;issue: 009::page 04022128
    Author:
    Qizhi Xu
    ,
    Wendel Sebastian
    ,
    Kaiwei Lu
    ,
    Yiming Yao
    ,
    Jingquan Wang
    DOI: 10.1061/(ASCE)ST.1943-541X.0003437
    Publisher: ASCE
    Abstract: This paper reports the shear performances of steel wedge block–crossed inclined stud–ultrahigh performance concrete (UHPC) connections for application to steel-concrete composite bridges. The study entailed 36 pushout tests based on the studs with 1.0, 1.5, and 2.0 aspect ratios, inclined 0°, 30°, 45°, and 60° from vertical. The test results show that in studs with aspect ratio less than 1.5 (ultrashort studs) and inclined at either 30° or 45°, shear strength increases 12% with initial slip increase of 47% and 110%, respectively, relative to the 0° connection. Also, the specimen comprising studs at 45° inclination showed a 1%–91% increase in secant shear stiffness at the elasto-plastic stage, implying less nonlinear sectional flexural stiffness response for such inclined connections. As the stud aspect ratio increased from 1.0 to 1.5, the shear strength increased by 13%, 25%, and 18% for studs inclined 30°, 45°, and 60°, respectively. Increased stud aspect ratio from 1.5 to 2.0 had only a minor influence on shear strength. During the test, the local embedment (UHPC over the stud head top) and UHPC slab shear failure with many subtle cracks showed pronounced ductility (continuous clear snapping sounds from steel fibers and major cracks observed approaching failure) for a stud aspect ratio less than 1.5. Furthermore, the reduced rigidity method, used in a given section under the service load, showed 10% lower deflection than 0° stud connections and a within-5% increase of the rigid connections for ultrashort studs. These results show that this type of shear connector exhibits good stiffness and strength performance, especially for ultrashort studs. In future research, low cyclic loading and high cycle fatigue tests should be performed on these connections.
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      Development and Performance of Innovative Steel Wedge Block–Crossed Inclined Stud–UHPC Connections for Composite Bridge

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4286733
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    • Journal of Structural Engineering

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    contributor authorQizhi Xu
    contributor authorWendel Sebastian
    contributor authorKaiwei Lu
    contributor authorYiming Yao
    contributor authorJingquan Wang
    date accessioned2022-08-18T12:30:43Z
    date available2022-08-18T12:30:43Z
    date issued2022/06/30
    identifier other%28ASCE%29ST.1943-541X.0003437.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4286733
    description abstractThis paper reports the shear performances of steel wedge block–crossed inclined stud–ultrahigh performance concrete (UHPC) connections for application to steel-concrete composite bridges. The study entailed 36 pushout tests based on the studs with 1.0, 1.5, and 2.0 aspect ratios, inclined 0°, 30°, 45°, and 60° from vertical. The test results show that in studs with aspect ratio less than 1.5 (ultrashort studs) and inclined at either 30° or 45°, shear strength increases 12% with initial slip increase of 47% and 110%, respectively, relative to the 0° connection. Also, the specimen comprising studs at 45° inclination showed a 1%–91% increase in secant shear stiffness at the elasto-plastic stage, implying less nonlinear sectional flexural stiffness response for such inclined connections. As the stud aspect ratio increased from 1.0 to 1.5, the shear strength increased by 13%, 25%, and 18% for studs inclined 30°, 45°, and 60°, respectively. Increased stud aspect ratio from 1.5 to 2.0 had only a minor influence on shear strength. During the test, the local embedment (UHPC over the stud head top) and UHPC slab shear failure with many subtle cracks showed pronounced ductility (continuous clear snapping sounds from steel fibers and major cracks observed approaching failure) for a stud aspect ratio less than 1.5. Furthermore, the reduced rigidity method, used in a given section under the service load, showed 10% lower deflection than 0° stud connections and a within-5% increase of the rigid connections for ultrashort studs. These results show that this type of shear connector exhibits good stiffness and strength performance, especially for ultrashort studs. In future research, low cyclic loading and high cycle fatigue tests should be performed on these connections.
    publisherASCE
    titleDevelopment and Performance of Innovative Steel Wedge Block–Crossed Inclined Stud–UHPC Connections for Composite Bridge
    typeJournal Article
    journal volume148
    journal issue9
    journal titleJournal of Structural Engineering
    identifier doi10.1061/(ASCE)ST.1943-541X.0003437
    journal fristpage04022128
    journal lastpage04022128-13
    page13
    treeJournal of Structural Engineering:;2022:;Volume ( 148 ):;issue: 009
    contenttypeFulltext
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