Calculation of robostness parameter of reinforced concrete frame system under special impact

A practical technique for determining the survivability parameter of reinforced concrete frame frame of a multi-storey building with complex-stressed elements under static-dynamic deformation caused by a special impact and an algorithm for numerical and analytical realization of this technique are presented. The values of parametric load, at which one of the criteria of special limit state occurs in the most stressed spatial section under the considered loading mode, are obtained from the solution of the system of canonical equations of the mixed method variant. In accordance with this method, the solution of the problem of nonlinear deformation of the frame system is constructed using the model of the substructure of the frame system described by the hinge-bar model, in which the places of possible disconnection of links are replaced by complex hinges, unknown angular and linear links. The proposed method of calculation of survivability of reinforced concrete frames with complex stressed elements satisfactorily describes the process of their deformation and exhaustion of bearing capacity of a structurally nonlinear frame system under the considered special impacts.