Effects of Freeze-Thaw Cycles on Interfacial Shear Transfer Characteristics in Section Steel Reinforced Concrete Composite Structures with Stud Connectors

This study examines how freeze-thaw cycles influence the shear transfer characteristics at the interface of section steel with stud connectors and concrete. Push out tests were performed on fourteen section steel reinforced concrete composite structures with stud connectors (SRCSC) and two without them. The analysis focused on examining the impact of variables such as the number of freeze-thaw cycles, the diameter of studs, and the arrangement of studs on the interfacial shear capacity of the SRCSCs. Experimental results showed that with an increase in the number of freeze-thaw cycles, the damage morphology of the SRCSCs transitions from stud shearing to concrete splitting. Concurrently, the interfacial shear capacity and shear stiffness of SRCSCs diminish. Large-diameter studs could effectively improve the interfacial shear properties of SRCSCs. Additionally, SRCSCs with studs positioned in the web demonstrate enhanced interfacial shear transfer capabilities compared to those with studs located in the flange. The proposed method for the residual interfacial shear capacity of the SRCSCs after freeze-thaw cycles was based on experimental data analysis. Results from this calculation method were consistent with the experimental observations. •The shear transfer performance of section steel reinforced concrete composite columns with studs connectors (SRCSCs) after freeze-thaw cycles was studied.•An in-depth analysis of the failure modes of SRCSCs after push-out tests was conducted.•The shear transfer mechanism of SRCSCs after experiencing freeze-thaw cycles was clarified.