This paper presents a study on the performance of two types of fully bolted connections in relation to progressive collapse. Two specimens were specifi cally designed and fabricated to represent these connections. One specimen utilized the traditional double web angle connection (DWA), while the other employed a new type of connector, resulting in a new fully bolted connection (NFB). The study thoroughly investigated various aspects of the specimens, including failure modes, load–displacement responses, and resistance mechanisms. The fi ndings revealed that the fl exural behavior and ultimate behavior of the NFB connection were superior to those of the DWA connection, particularly in terms of fl exural behavior. However, the rotational behavior of the NFB connection was slightly inferior to that of the DWA connection. Additionally, refi ned numerical models were used to simulate the failure modes and load–displacement responses of both connections, and a strong correlation was observed between the test results and the numerical analysis. Furthermore, a parametric analysis of the NFB connection was conducted, leading to the discovery that modifying the structural type of the new connector, specifi cally adjusting the form of part C from fl ush to extended, was the most eff ective measure for enhancing the anti-progressive collapse capacity of the NFB connection. Moreover, the rotational capacity and ultimate load-carrying capacity of the NFB connection could be improved by adjusting the thickness of the new connector and increasing the diameter of the bolts within the steel beam.