Reconstruction of office center with an extension in Kremenchuk city
Students Name: Osadtsiv Stepan
Qualification Level: magister
Speciality: Industrial and Civil Construction
Institute: Institute of Civil Engineering and Building Systems
Mode of Study: part
Academic Year: 2022-2023 н.р.
Language of Defence: ukrainian
Abstract: Kremenchuk is a city in the Poltava’s region of Ukraine, the administrative center of the Kremenchuk district. The population is 217,000 people (2021). According to this indicator, it ranks 31st in Ukraine. Kremenchuk is a large industrial center of Poltava region, as well as the second largest and most important city of Poltava Region. Today, 86 industrial enterprises, 58 construction organizations of various forms of ownership and about 14,000 subjects of entrepreneurial activity are operating in the city. According to the rating of regions, cities and districts of Ukraine, conducted by the non-governmental analytical center "Institute of Reforms", Kremenchuk ranks 8th out of 494 territories of Ukraine. According to economic indicators, it ranks 15th among 45 large cities of Ukraine. The city of Kremenchuk is expanding and developing, and was made a decision to reconstruct one of the administrative buildings. According to the master plan, the technical and economic indicators are: building area - 9,982.02 m2, building area after reconstruction - 13,416 m2. The general plan shows the ‘Wind rose’ with the orientation of the buildings. The overall dimensions of the building are 55.14 x 55.16 m between the axes. The building has a simple rectangular shape in plan. The maximum height of the building is 36.5 m. It has 8/9 floors. The planning was made in accordance with all project requirements and in compliance with current regulations, common rules, fire requirements, minimal squares of office spaces, including technical rooms, bathrooms, engine room, etc. The construction of the external walls and facades is a ceramic hollow block 250 mm thick, insulated with hard cotton wool 150 mm thick, the decoration is carried out with a cement-perlite mortar with subsequent painting with frost-resistant and moisture-resistant facade paints according to the task. Also, the facade is decorated with small architectural forms. The structural scheme of the building is a frame-elm steel type. The stability of the frame along the letter and number axes of the building is ensured by the rigid connection of the steel columns with the existing reinforced concrete columns, the rigid connection of the columns with the main beams GB-1, GB-2 of the floor, as well as vertical ties. The stability of the frame in the horizontal direction is provided by the hard disk of the floor and horizontal ties. Floor slab on profiled sheet calculated without PC, is using profiled sheet TP-85 PO from ‘TPK’. Slab thickness is140 mm. The profiled floor covering is designed according to a 3-span non-separated bearing scheme. Columns. The calculation of the main load-bearing metal columns was performed in the ‘Dlubal RFEM 5.25’ software package. In this work was considered the calculation of the most loaded columns which begin from the mark 23,460. Profiles are selected by automatic software calculation. Columns and column supports was founded from the European NEA metal assortment. Weights. The calculation was performed in the ‘Dlubal RFEM 5.25’ software complex. Weights were tested without any program software. Cover beams. The calculation of the main load-bearing metal beams was performed in the ‘Dlubal RFEM 5.25’ software package. Let’s consider the calculation of beams that serve as load-bearing structures of the roof, namely, the general fragment of the roof in axes 2-5/А-Л. Profiles will be selected by automatic software calculation. The main beams of the roof bear the load not only from the own weight of the structure. Beams from the Europinian assortment of metal used in this project as well as from the native one. External covering - walls made of ceramics block insulated with mineral wool plates. Load walls of staircase and elevator halls - 250mm and 380mm thicknes from solid ceramic bricks. Internal covering - plasterboard according to LSTK frame/gas block D300, thickness 100 mm, weight no more than 80 kg/m2. Partitions in the bathrooms are made of plasterboard according to LSTKa frame/gas unit D300, thickness 100 mm, weight no more than 80 kg/m2. The technological map was designed for the insulation of facades. Sheet No. 8 shows the general scheme of the organization of the workplace, the movement scheme of the main working mechanisms with their markings, and all technological processes are marked as well. Technical and economic indicators were developed and calculated, the list of main resources was indicated, and a set of technological standards was selected. Control of construction works and its phasing are given in tabular form (SOQC - system of operational quality control). The total duration of construction according to the developed calendar schedule is 88 working days. The average number of workers at the construction site is 29 people. The cost of construction according to the estimated calculation is 63 million 604 thousand hryvnias. The construction cost of 1 square meter is 13,561 hryvnias, or $370.53 according to the current rate of the NBU. The price per square meter does not include: parking spaces and interior decoration. The topic of the scientific work is the verification of the bearing capacity of the existing columns. Examination of concrete was made with a sclerometer$ determination of concrete strength - with a Schmidt hammer$ measurements of the diameter of reinforcement - with a professional meter. According to the results, it is necessary to strengthen the columns of the middle and most heavily loaded extreme rows of the 1st and 2nd floors, because and the bearing capacity of the concrete body is not ensured.