Analysis of economic efficiency of constructive decisions at designing of the residential 8-storeyed house in Rivne
Students Name: Sadkovyi Ostap Andriiovych
Qualification Level: magister
Speciality: Urban Construction and Economy
Institute: Institute of Civil Engineering and Building Systems
Mode of Study: full
Academic Year: 2020-2021 н.р.
Language of Defence: ukrainian
Abstract: Sadkovyi O.A., Vybranets Yu.Yu. (supervisor). Analysis of economic efficiency of constructive decisions at designing of a residential 8-storey building in Rivne. Master’s thesis. – Lviv Polytechnic National University, Lviv, 2020. Extended abstract The building is designed eight-storey with a basement and attic. The building is complex in plan, measuring 23.0 x 23.0 m in axes. The height of the basement is 3.00 m, the first and second floors are 3.8 m, and all other typical floors are 3.0 m. According to the structural scheme, the building is frameless, with load-bearing longitudinal and transverse monolithic walls, 200 mm thick. The spatial rigidity of the building is ensured by the joint work of longitudinal and transverse monolithic walls, monolithic slabs and monolithic roof. The roof of the building is flat, the internal drainage. On the first and second floors there are trade and administrative offices. On a typical floor there are residential apartments. In the section of building constructions the calculation and construction of a monolithic reinforced concrete foundation slab is performed. Its thickness was 600 mm, concrete class C20 / 25. The significance of the efforts was in the LIRA-CAD software package. According to the calculation, double reinforcement with background reinforcement with a diameter of 16 A400C with a step of 200 mm was obtained. Additional reinforcement is performed by separate rods in the zones of maximum moments, with a diameter of 16 class A400C. The floor slab is designed with a thickness of 150 mm of concrete class C20 / 25. Efforts were also made in the LIRA-CAD software package. Reinforcement was performed with reinforcement with a diameter of 8 A400C with a step of 200 mm, and in places of maximum moments in the upper zone - with a step of 100 mm. In the technological section, three technological maps were developed for the main construction processes, namely the installation of monolithic reinforced concrete walls, the installation of monolithic reinforced concrete floors and the performance of work on a flat rolled roof. A construction master plan has also been developed, which shows the organization of the construction site, temporary roads and communications. In the economic section, a local estimate for the main construction and installation works has been made. All calculations were made on the basis of prices and time norms for major construction works as of November 2020. The total construction cost was approximately UAH 23 million. The purpose of research is to analyse the economic efficiency of structural solutions of the building. Both options are made of monolithic reinforced concrete. In the first case, monolithic reinforced concrete walls were arranged in the longitudinal and transverse directions. In the second version, the classic scheme for buildings of this plan was adopted - monolithic reinforced concrete columns and self-supporting brick walls. The walls are made according to the calculation with a thickness of 200 mm of concrete class LC12/13, columns - 600 x 250 mm, of concrete class C20/25. The main advantage of using monolithic walls made of lightweight structural reinforced concrete is the ability to use a slab of smaller thickness and increase the effective area of the building by reducing the thickness of the walls. The main advantage of using columns is the possibility of free planning or re-planning after the main construction and installation works and savings on the cost of concrete - despite the higher class, ordinary heavy concrete is cheaper. Keywords: construction master plan, lightweight concrete, expanded clay concrete, structural concrete, monolithic reinforced concrete wall. References. 1. DSTU B B.2.6-156: 2010 "Concrete and reinforced concrete structures of heavy concrete. Design rules ". - Kyiv: Ministry of Construction of Ukraine, 2010 2. Romashkina M.A., Titok V.P. Software complex LIRA - CAD. User manual. - K., 2018. 3. DBN B.1.2-2: 2006. Loads and effects. - Kyiv: Ministry of Construction of Ukraine, 2006 4. Chernenko V.K., Yarmolenko M.G. Technology of construction production. - K., "Higher School", 2018. 5. DSTU B B.2.7-176: 2008 "Concrete and concrete mixtures. General technical conditions ". - Kyiv: Ministry of Construction of Ukraine, 2010