Demchenko O. Stress-strain state of centrally compressed concrete filled steel tube elements with core of high-strength concrete

Object - operation of short concrete filled steel tube elements with core of high-strength concrete under compressive loads; purpose is to identify deformation and establishment of the actual work of concrete filled steel tube elements with core of high-strength concrete under actions impaction of compressive loads depending on the physic and mechanical characteristics of the core material and the method of load transfer; methods - experimental methods of research of physical and mechanical characteristics of the core material and the method of load transfer; strain gauge method and mechanical methods of research of the stress-strain state and strength; methods of mathematical statistics in the processing of results of experimental trails; numerical methods for the analysis of the stress-strain state condition; the novelty - for the first time there have been carried out the experimental investigation of deformed state, the bearing capacity and character of colipase of concrete filled steel tube elements with core of high-strength concrete, carrying capacity and nature of colipase the concrete filled steel tube elements with core of high-strength concrete; new data on change of effectiveness of concrete core operation in terms of concrete filled steel tube have been obtained, depending on the strength of used materials and method of transferring the compression loads; numerical methods of determination of carrying capacity of compressed of concrete filled steel tube elements there has been the further development got further development; results: there has been developed the compositions of high-strength concrete using the Portland PC I-500 H concrete and local materials; engineering method of calculating the carrying capacity of compressed concrete filled steels with use of cores of high-strength concrete has been developed; industry branch - construction