Nowadays, need of evaluation of strategic existent buildings against progressive collapse feels more than the past, because of the problem of the terrorist attacks or subversive explosions. In this case, potential of progressive collapse of steel structures with simple connections will be more than the other structural systems and the results will be more destroyer. Therefore, in this research potential of the progressive collapse of simple bolted connections numerically investigated. The main gain of this research is presentation of some methods to improve this kind of connections against sudden column removal. For this purpose rotation of the connections are compared with the allowable amount. The proposed methods do not intend to increase hardness and rigidness of the connections, and thus they will not change in size or type of the loads of the related member. the Simple bolted connections include beam-to-column connection with double web angles as a base connection, and six other connections that developed from this base connection. Results show that use of tendon in the ways is suggested will be very hopeful in this case.