Experimental justification of the dynamic coefficient

Abstract

Important part of the structural robustness analysis is the time period during which the elements of the bearing structure are destroyed. The researches show that the shorter the time of a failure of a particular rod is, the greater the dynamic forces in structure. In this article the problem of the experimental definition of the time lapse is considered. Solution of this problem will allow to justify failure time of the tension and compressed structural elements and to confirm the values of the dynamic coefficient experimentally. To solve this problem, a series of experimental studies of square solid rods was done. During the experiment, some of the rods were tensioned to destruction, others were centrally compressed until the load capacity was exhausted due to loss of stability. The experiment was carried out and funded by the Center of shared usage of equipment NRU MSUCE. Due to the obtained data on deformation mode of the tested rods (after their loss of stability and strength), time of failure can be calculated. An analysis of the obtained experimental data showed that for the tension elements, the average failure time was 0.37 sec. For compressed rods the operating time of the rod after the loss of stability depends on the flexibility and has an average value from 1 to 4 seconds. The obtained results make it possible to assign reasonable failure time of the bars of truss for making the correct dynamic calculation.