EXPERIMENTAL DETERMINATION OF THE PARAMETERS OF THE STATIC-DYNAMIC DEFORMATION OF CONCRETE UNDER LOADING MODAL

Abstract

The method of experimental analysis of concrete and reinforced concrete elements is given in order to determine the parameters of concrete deformation under static loading to a given level, followed by a single dynamic high-speed loading by a shock load. Tests of samples are carried out by means of mode static-dynamic loading, which is carried out using a specially designed device that allows you to fix a given level of static loading of the test specimen and load it from this level by a shock load with the specified dynamic parameters. The developed method static-dynamic tests, the priority of which is protected by a patent of the Russian Federation, allows to experimentally determine the parameters for diagrams of deformation of concrete such as dynamic modulus of deformation, dynamic strength of concrete, the ultimate strain of concrete at different conditions considering static and dynamic loading, and the change of the coefficient of dynamic strength of concrete under different levels of initial static load. The analysis of test results the first series of concrete prisms and deformation the strength and time parameters for tested samples and also obtained using ultrasonic PULSAR 2.1 of stress changes and volume deformation of concrete under these modes of loading.