Published: Građevinar 78 (2026) 2
Paper type: Scientific research paper
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Experimental investigation of the coordinated working performance of high-strength reinforcement and UHPC under varying parameters

The development of ultrahigh-performance concrete (UHPC) has prompted extensive research into the preparation and evaluation of UHPC performance. However, limited studies have explored the coordinated working performance of UHPC in conjunction with high-strength rebars within structural systems, particularly from a material-level perspective. This study investigated the relationship between the material mechanical properties and seismic performance of specimens under varying parameters by conducting cyclic tests on five reinforced UHPC columns with different configurations. The results demonstrated that high-strength rebars effectively constrains UHPC and enhances the bearing capacity of UHPC columns. In addition, incorporating a CFRP sheet or increasing the lateral confinement strength mitigated the expansion of UHPC in the core area and the concentration of local plastic damage. The UHPC and longitudinal reinforcement exhibited effective cooperative performance as the axial compression ratio increased.

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