Use of concrete-filled steel tube structures for reconstruction of demolished houses

Abstract This article presents a recovery alternative method of large-panel reinforced concrete residential buildings damaged by artillery shells, using the example of destroyed buildings in Kharkiv. The consequences of such damage are described and the use of subframe made of tubular concrete structures filled with specially selected composition (fiber-reinforced concrete and concrete modifier) is proposed as an effective solution. An alternative of the subframe for damaged floor slab has been developed. The use of tubular concrete, as well as traditional steel frameworks, is limited by their significant deformation property (structures reach the allowable deflection limit even when there is still a considerable strength reserve), which leads to the need to increase the structural section. This is a problem for large-panel house structures, as they are based on minimum crosssections. The proposed subframe design and its subsequent calculation showed that the use of this technology leads to a significant reduction in the cross-section of the structure. The application of these structures leads to rational use of properties of such structures while minimising their drawbacks. Based on the results, recommendations have been provided for using these structures to correct the problem outlined in the article.