EXPERIMENTAL LIFE STUDIES OF REINFORCED CONCRETE FRAMES WITH GIRDERS REINFORCED BY INDIRECT REINFORCEMENT

Abstract

Results of experimental investigations of deformation, crack resistance and bearing capacity of multi-storey monolithic reinforced concrete frames reinforced by indirect reinforcement at their static-dynamic loading caused by sudden hypothetical removal of one of the columns are presented. According to the experimental data, diagrams "moment - curvature" and "load - crack opening width" are built under the considered two stage loading mode: the obtained results allowed to estimate dynamic loading in frame elements (static - at the first stage and dynamic - at the second stage). Comparison of experimental parameters of the diagram for structures of frames reinforced by indirect reinforcement and frames without indirect reinforcement shows that the use of indirect reinforcement in addition to conventional rod reinforcement increases the survival of the structural system under special effects and can be considered as one of the ways to protect reinforced concrete frames of buildings from progressive collapse.