Buts'ka O. The strength of the connection node prefabricated panels and monolitic beams cast flat precast and cast-in-situ deck

Subject of inquiry is the stress-strain state of the junction and technical and economic indices of precast and cast-in-situ floor with precast hollow core slabs and monolithic beams. The aim of the research is to develop structural solution and to investigate the stress-strain state (SSS) of the junction between prefabricated slabs and monolithic beams of flat precast and cast-in-situ floor. Methods: methods of the reinforced concrete theory, numerical simulation techniques, methods of experimental research in accordance with standard procedures, methods of technical and economic evaluation of design solutions. Theoretical and practical results: construction of the flat precast and cast-in-situ floor is developed (2 patents of Ukraine (N23425U and N23418U) on useful model are received for the floor structure); the procedure and results of experimental studies of SSS and the strength of the junction of the flat precast and cast-in-situ floor are developed; design methods for the node between prefabricated slabs and monolithic beams were developed according to the obtained experimental results of the strength and the identified destruction types. Scientific novelty: constructive solution of the flat precast and cast-in-situ floor, consisting of precast concrete hollow-core slabs, which are joined in the same level with monolithic beams is proposed (has further developing); first the experimental dependence of the strength of junction between the precast concrete hollow core slabs and monolithic beams on determining parameters are established; results of field experimental studies of strength and deformability of precast-monolithic floor are obtained (has further developed); the features of the SSS element of the flat precast and cast-in-situ floor were determined and according to them the design methods for the node between prefabricated slabs and monolithic beams were proposed (has further developing). Degree of implementation: The proposed methods have been used in the design of a multifunctional shopping and demonstration center near the Tverskaya street and Kalinovaya street, 9 and in the design of a typical floor of multifunctional complex for public use on the Ispolkomovskaya street, 22/24 in Dnipropetrovs'k, a multi-storey administrative-residential complex on the Soviet street, 1 and administrative and residential complex on the Zina Belaya - Korolenko street in Novomoskovsk. Scope: design organizations for the flat precast and cast-in-situ floor design.