Interfacial Behavior of the Steel-UHPC Composite Deck With Toughened Epoxy Bonding

被引:2
作者
Jiang, Jinlong [1 ,2 ]
Leng, Jingchen [1 ,2 ]
Zhang, Jiangtao [1 ,2 ]
Guo, Jincen [1 ,2 ]
机构
[1] State Key Lab Mt Bridge & Tunnel Engn, Chongqing, Peoples R China
[2] Chongqing Jiaotong Univ, Sch Civil Engn, Chongqing, Peoples R China
基金
中国国家自然科学基金;
关键词
epoxy; bonding; interfacial behavior; toughness; ultra-high- performance concrete; BRIDGE DECK; CONCRETE; SHEAR; PERFORMANCE; UHPFRC;
D O I
10.3389/fmats.2022.859214
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Using traditional stud connectors to connect the ultra-high-performance concrete layer and steel deck is detrimental to the construction speed and fatigue performance of the composite structure. Connecting the steel-UHPC interface with toughened epoxy bonding is a potential alternative to avoid this issue. To explore whether the toughened epoxy bonding interface can reduce the amount of bridge deck studs or even cancel the studs, a numerical simulation was conducted in this paper. The non-toughened epoxy bonding interface, the toughened epoxy bonding interface, a few studs + toughened epoxy bonding interface, and the full stud connection interface were designed to study the interfacial behavior of the steel-UHPC composite deck. Moreover, the constitutive model of the toughened epoxy bonding interface is verified through the direct shear test and compression-shear test. The results show that the maximum interface shear stress of the toughened epoxy bonding interface is 0.61 MPa under the standard wheel load, which is 20.78% lower than that of the non-toughened epoxy bonding interface. Under the overload, the interface failure of the toughened epoxy bonding interface is more concentrated and exhibits a smaller damage area compared with the non-toughened epoxy bonding interface. When the interface defect is 5%, the toughened epoxy bonding interface only has a few interface damages, exhibiting good defect tolerance. Compared to the traditional full stud connection interface, the interface shear stress in the few studs + toughened epoxy bonding interface is more uniform, which avoids the stress concentration in the root of studs, and the studs' average stress is significantly reduced by 63.21%. It is verified that using the toughened epoxy bonding interface can significantly reduce the amount of studs.
引用
收藏
页数:16
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