Abstract: When subjected to accidental loads, reinforced concrete structures with corner column removal exhibited weaker peripheral restraints, making them more prone to progressive collapse than those with edge or middle column removal. Therefore, in this study, high-performance ferrocement laminate (HPFL) is used to strengthen beams which are connected to the corner column to enhance the progressive collapse behavior of structures with corner column removal. Two 1/3 scaled single-bay single-storey substructures were designed and fabricated, including one control specimen and one HPFL-strengthened specimen. Quasi-static tests were conducted to study the progressive collapse response of the HPFL strengthened structure after corner column removal. Subsequently, ABAQUS finite element software was employed to further investigate the load redistribution mechanism of HPFL-strengthened specimen, as well as the effects of ideal boundary conditions and beam-slab interaction on progressive collapse of structures with corner column removal. The results indicate that: using HPFL to strengthen beams have negligible effects on the initial stiffness, on the yield displacement, on the peak displacement, and on the ultimate displacement of the structure. But it increases the peak load and ultimate load by 15.6% and 12.9%, respectively. After corner column removal, the axial force increases in adjacent columns while decreases in the diagonal column. The beam-strengthening method have a minimal effect on the load-redistribution mechanism. Stronger peripheral constraints in RC structures led to increased peak load-carrying capacity. Moreover, the static resistance of the beam-column frame is doubled after the beams are strengthened. Beam-slab interaction significantly enhances the progressive collapse resistance of structures. Finally, the resistance mechanism of structures with corner column removals was theoretically analyzed. A theoretical model predicting the peak resistance of the RC structures against progressive collapse after corner column removals was presented, and the computational results upon the model proposed are compared with the experimental ones, which exhibits a well agreement with the experimental results.