State of the Art of Bond Behavior of Lap Spliced Rebars in Ultra-High-Performance Concrete

Lijun Xie

doi:10.63313/AERpc.9086

Authors

Lijun Xie School of Civil Engineering, Central South University of Forestry and Technology, Changsha 410004, China Author

DOI:

https://doi.org/10.63313/AERpc.9086

Keywords:

Ultra-high-performance concrete, Lap-spliced rebars, Bond behavior, Bond stress distribution, failure mode

Abstract

Ultra-high performance concrete (UHPC) exhibits excellent mechanical proper-ties and superior bond performance with reinforcing bars compared with nor-mal concrete. Owing to its high bond strength, UHPC has attracted increasing attention in lap-spliced rebar connections. This paper reviews the bond behav-ior of lap-spliced rebars in UHPC. The main experimental methods and failure modes are first summarized. Then, the effects of key parameters, including steel fiber volume fraction, rebar diameter, lap length, clear spacing, cover thickness, and transverse reinforcement ratio, are discussed. In addition, the bond stress distribution along the lap length is reviewed. Existing studies indicate that the bond strength of lap-spliced rebars in UHPC increases with steel fiber content and cover thickness, while it generally decreases with increasing rebar diameter and lap length. Proper transverse reinforcement can restrain crack propagation and improve bond performance. The bond stress distribution also varies with lap length and exhibits different characteristics under different splice configura-tions. Finally, future research needs on the bond behavior of lap-spliced rebars in UHPC are briefly discussed.

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