This study examines the disassembly and reusability of two practical shear connection systems, namely shield anchor bolts and screws, through a series of monotonic and cyclic push-out tests on 20 specimens under 4 setups, in order to assess their stiffness, peak load, ductility, and failure mechanisms. A reuse potential testing protocol is also developed to evaluate the performance after cyclic loading and reassembly, and a modified separation damage index is introduced to quantify the circularity of these systems. The experimental results show that the stiffness gradually increases with reuse cycles following a logarithmic relationship, and that the average stiffness after reassembly increases by over 30 %. It is also shown that the peak load remains largely unchanged with respect to the monotonic counterparts. Steel-timber composite connections with shield anchor bolts, firstly tested in this paper, are found to exhibit superior reusability, with minimal damage to the connection components compared to those with screws. Based on the test results, a constitutive model is proposed and validated, and shown to provide a suitable approach for predicting the full load-slip response of the connections. Circularity assessments carried out for the tested shear connections, within practical configurations, confirm that dry bolted connections achieve near-full reuse potential, while wet systems have comparatively lower reusability. Overall, the findings show that steel-timber composite systems can be effectively designed for reuse, provided that demountable connections with minimal degradation during service, are used. Shield anchor bolts and other demountable systems are shown to have the potential to retain key structural characteristics through multiple reassemblies, supporting circular economy principles and reducing material waste in composite floor systems.