Shear behaviour of the UHPC-NSC interface with castellated keys : effects of castellated key dimension and dowel rebar

Dongzhi Guan; Jiabin Liu; Cheng Jiang; Zixuan Chen; Zhengxing Guo

doi:10.1016/j.istruc.2021.01.088

Shear behaviour of the UHPC-NSC interface with castellated keys : effects of castellated key dimension and dowel rebar

Dongzhi Guan, Jiabin Liu, Cheng Jiang, Zixuan Chen, Zhengxing Guo

Western Sydney University

Research output: Contribution to journal › Article › peer-review

Abstract

When utilizing ultra-high performance concrete (UHPC) and normal strength concrete (NSC) together, the interface between the UHPC and NSC in this composite structural member is essential and needs to be clearly understood. In this paper, push-off tests are carried out on 10 UHPC-NSC joint specimens with considerations of the castellated key size and the use of dowel rebar. The effect of the cohesion between the UHPC and NSC on the interfacial shear resistance is found to be very limited and can be ignored. The UHPC-NSC joints with castellated keys of 10 mm have the best mechanical performance if no dowel rebar is applied. When there is dowel rebar in the joint specimens, the specimens have shear resistance with post-peak residual loads. The dowel rebar configured specimens with larger castellated keys have higher residual shear resistances because of the improved post-peak residual interlocking effect.

Original language	English
Pages (from-to)	172-181
Number of pages	10
Journal	Structures
Volume	31
DOIs	https://doi.org/10.1016/j.istruc.2021.01.088
Publication status	Published - 2021

Access to Document

10.1016/j.istruc.2021.01.088

Cite this

@article{2a037a2220a44597866f6b7301da7534,

title = "Shear behaviour of the UHPC-NSC interface with castellated keys : effects of castellated key dimension and dowel rebar",

abstract = "When utilizing ultra-high performance concrete (UHPC) and normal strength concrete (NSC) together, the interface between the UHPC and NSC in this composite structural member is essential and needs to be clearly understood. In this paper, push-off tests are carried out on 10 UHPC-NSC joint specimens with considerations of the castellated key size and the use of dowel rebar. The effect of the cohesion between the UHPC and NSC on the interfacial shear resistance is found to be very limited and can be ignored. The UHPC-NSC joints with castellated keys of 10 mm have the best mechanical performance if no dowel rebar is applied. When there is dowel rebar in the joint specimens, the specimens have shear resistance with post-peak residual loads. The dowel rebar configured specimens with larger castellated keys have higher residual shear resistances because of the improved post-peak residual interlocking effect.",

author = "Dongzhi Guan and Jiabin Liu and Cheng Jiang and Zixuan Chen and Zhengxing Guo",

year = "2021",

doi = "10.1016/j.istruc.2021.01.088",

language = "English",

volume = "31",

pages = "172--181",

journal = "Structures",

issn = "2352-0124",

publisher = "Elsevier",

}

TY - JOUR

T1 - Shear behaviour of the UHPC-NSC interface with castellated keys : effects of castellated key dimension and dowel rebar

AU - Guan, Dongzhi

AU - Liu, Jiabin

AU - Jiang, Cheng

AU - Chen, Zixuan

AU - Guo, Zhengxing

PY - 2021

Y1 - 2021

N2 - When utilizing ultra-high performance concrete (UHPC) and normal strength concrete (NSC) together, the interface between the UHPC and NSC in this composite structural member is essential and needs to be clearly understood. In this paper, push-off tests are carried out on 10 UHPC-NSC joint specimens with considerations of the castellated key size and the use of dowel rebar. The effect of the cohesion between the UHPC and NSC on the interfacial shear resistance is found to be very limited and can be ignored. The UHPC-NSC joints with castellated keys of 10 mm have the best mechanical performance if no dowel rebar is applied. When there is dowel rebar in the joint specimens, the specimens have shear resistance with post-peak residual loads. The dowel rebar configured specimens with larger castellated keys have higher residual shear resistances because of the improved post-peak residual interlocking effect.

AB - When utilizing ultra-high performance concrete (UHPC) and normal strength concrete (NSC) together, the interface between the UHPC and NSC in this composite structural member is essential and needs to be clearly understood. In this paper, push-off tests are carried out on 10 UHPC-NSC joint specimens with considerations of the castellated key size and the use of dowel rebar. The effect of the cohesion between the UHPC and NSC on the interfacial shear resistance is found to be very limited and can be ignored. The UHPC-NSC joints with castellated keys of 10 mm have the best mechanical performance if no dowel rebar is applied. When there is dowel rebar in the joint specimens, the specimens have shear resistance with post-peak residual loads. The dowel rebar configured specimens with larger castellated keys have higher residual shear resistances because of the improved post-peak residual interlocking effect.

UR - https://hdl.handle.net/1959.7/uws:62012

U2 - 10.1016/j.istruc.2021.01.088

DO - 10.1016/j.istruc.2021.01.088

M3 - Article

SN - 2352-0124

VL - 31

SP - 172

EP - 181

JO - Structures

JF - Structures

ER -

Shear behaviour of the UHPC-NSC interface with castellated keys : effects of castellated key dimension and dowel rebar

Abstract

Access to Document

Other files and links

Fingerprint

Cite this