Efimenko V. Bearings structures of steel pipes filled with spun concrete

Test subject - carrier and operational capacity of tube-concrete elements with centrifuged concrete nucleuses of different types. Test aim: there were experimentally investigated and improved the theory and methods of calculating contracted constructions of steel pipes filled with centrifuged concrete. Test methods: experimental methods of investigating hard-deformed state and carrier capacity of centrifuged tube-concrete elements; mathematical and physical modeling hard-deformed state of tested elements; general methods of empiric and theoretical investigations, construction mechanics methods for estimating hard-deformed state of tested constructive elements. Equipment and devices: press PMM-1000, belt-driven centrifuge, indicating gages, resistance strain gages and strain-gauge-type station, archmeter. Main results: there was made the analysis of theoretical and experimental investigation of centrifuged tube-concrete constructions as well as work of concrete under conditions of voluminous compressed state; there were held experimental investigations and exposed the regularities of work of centrifuged elements working for axial compression; there were experimentally tested and revealed the regularities of hard-deformed state of centrifuged tube-concrete elements; there was held the experimental projecting and constructing of centrifuged concrete. Scientific innovation of results: there were at first got the results of carrier capacity and hard-deformed state of centrifuged tube-concrete elements; there were carried out the methods of estimating hard-deformed state of centrifuged tube-concrete elements with a glance to voluminous compressed state of their nucleus and cover; there were developed the methods of calculating carrier capacity of compressed centrifuged tube-concrete elements; there were offered the methods of rational projecting compressed centrifuged tube-concrete elements. Practical value of results: there were offered and used in the construction new types of centrifuged tube-concrete constructions; estimating their technical-economical efficiency was held; there were developed engineering methods of calculating compressed centrifuged tube-concrete constructions; there was offered the criterion of rational projecting that maximally corresponds to engineering practice, there were made some proposals to Ukrainian standards of projecting steel- ferroconcrete constructions. The method of calculating centrifuged tube-concrete elements developed on the base of the tests is used in technical education.