THEORETICAL AND NUMERICAL INVESTIGATIONS IN EFFECTS OF END-SUPPORTED SPRINGS AND DAMPERS ON INCREASING RESISTANCE OF BLAST DOORS

One of the frequently-concerned issues in the research field of protective engineering is how to increase the resistance of blast doors. A new measure setting springs and dampers on the ends of blast doors to increase the resistance is proposed. Firstly, dynamic responses of an elastically and damply supported beam subjected to blast loads are analyzed theoretically and the effectivity of the springs and the dampers on increasing the structural resistance is proved. In order to further investigate the effectivity in the case of nonlinear responses, two typical flat-type and arch-type concrete-filled steel blast doors subjected to blast loads induced by nuclear and conventional weapons are then analyzed by finite element analysis software ABAQUS. It is demonstrated that the resistance of the blast doors can be increased obviously by the springs and the dampers, and the shorter the duration of the loads, the more effective the increasing of the resistance.