Survivability of the Frame-Rod Reinforced Concrete Building Framework in Accidental Action

Abstract

A methodology and an algorithm for calculating the survivability parameters of a long-term deformable reinforced concrete building frame in extreme states are presented. Analytical dependencies for determining the value of the creep measure are taken in accordance with the use of approximate dependencies from the recommendations of the NIIZHB. On this basis, a method is proposed for determining the cross-section bending stiffness of the frame elements. The deformation criterion of a special limiting state is formulated taking into account the nonequilibrium processes of prolonged deformation of the structural system elements. The numerical analysis results of the long-term deformable reinforced concrete frame survivability potential with a sudden removal of the one structural element, taking into account the long-term deformation prehistory of the considered building frame under an operating load, are presented. The exposure of the structural system survivability from the its loading moment to its transformation into a kinematically variable system has been determined.

Dinamic Forces in the Eccentrically Compressed Members of Reinforced Concrete Frames Under Accidental Impacts

“…Interest to solving scientific problems related to collapse resistance under special impacts increases and attracts more and more attention of specialists in the field of structural design and analysis as evidenced by the number of research articles published over the past two decades. In many countries including Russia, the theoretical [1][2][3][4][5][6][7][8] and experimental [9-14] studies have been performed that became the basis for development and introduction of new regulatory documents for the facilities' protection against progressive collapse under accidental impacts [15][16][17][18]. Currently, the most complex and debatable question in the considered field is the assessment of the dynamic effects in structural systems during forces' redistribution through the alternate load paths, when accidental impact occurred [20].…”