Beam-to-column connections with flush end plates have been increasingly used in steel and composite structures. Demountable connections are generally assembled from prefabricated structural members, which can be dismantled and reused after their useful service life. This paper presents an innovative form of beam-to-column flush end plate connection for steel and composite frames, and demountability of this type of connection can be achieved by utilizing blind bolts. Finite element models were developed to investigate the behaviour of beam-to-column connections. The finite element models have been verified against experimental data. It was found that the finite element models were capable of predicting the behaviour of the beam-to-column connections accurately. The behaviour and performance of steel beams and blind bolts were discussed based on the finite element analysis results. Blind bolts and end plate play an important role in the design of beam-to-column connections.