EXPERIMENTAL RESEARCH ON CONCRETE DEFORMATION DURING UNLOADING AT A DESCENDING SECTION AND RELOADING

Abstract

The results are presented for the experimental research on concrete, loaded to the formation of a descending section on the stress-strain diagram, unloading from the descending section, and subsequent reloading. The tests have been conducted on a special device, simulating a one-time stat-ically indeterminate structural system. The factors influencing the formation of unloading and re-loading diagrams are determined. Also, empirical dependencies have been given, using which it s possible to make calculations of structural systems when unloading zones are observed. This happens when systems are not repeatedly reloaded and in cases of local damage occurring for vari-ous reasons. The necessity for such studies is substantiated.