STRENGTHENING THE UNFROZEN FOUNDATION UNDER THE WATER TOWER
Abstract
The monolithic reinforced concrete foundation under the water tower height of 18 meters in the village of Kutuzivka, Kharkiv region, was subjected to freezing during construction. The strength of concrete at the same time decreased significantly and amounted to 5.6 MPa for a given project value of 15 MPa. It was necessary to recognize the foundation: either to completely dismantle it and to rebuild it, or to remain in a weakened state by taking some measures to strengthen it and reconstruct it.
Analyzing the design and technical documentation and taking into account the constructive proposals for strengthening the foundation, calculations of the bearing capacity of the reinforced foundation were performed and determined its deformation characteristics. The calculations were performed on the software complex "Lira CAD". Tensions were determined in finite elements of the foundation for a three-dimensional three - dimensional model: x, y, z. At the same time, major tensions were identified.
Calculations have shown that the magnitude of the main stresses in the foundation concrete is in the range from 0.2 MPa to 0.5 MPa, which is quite permissible to ensure the strength and safety of the operation of the built basement. Vertical displacements of the foundation in the zone of its soles reach 10 mm allowed by the norms for engineering structures of this type.
The implementation of the proposed recommendations for reinforcement and partial reconstruction of the foundation (cutting of the upper layer of concrete with a thickness of 350 mm, coverage around the perimeter of an octagonal foundation with a reinforced concrete corset with a thickness of 90 mm and concreting of these cavities with high strength concrete, class C 20/25) reliability and operational safety during the standard period of operation - at least 60 years and achieve economic efficiency.
Keywords: monolithic foundation, freezing, amplification, reconstruction, preservation of weakened concrete, economic effect
References
Література
ДБН В.1.2-14:2009 Загальні принципи забезпечення надійності та конструктивної безпеки будівель, споруд, будівельних конструкцій та основ [Текст]. – Київ: Мінре-гіонбуд України, 2010. – 37 с.
ДСТУ БВ.2.6-156:2010 Бетонні та залізобетонні конс-трукції з важкого бетону. Правила проектування [Текст]. – Київ: Мінрегіонбуд України, 2011. – 118 с.
Бедов, А.Н. Обследование и реконструкция железобе-тонных и каменных конструкций эксплуатируемых зда-ний и сооружений [Текст] / А.Н. Бедов, В.Ф. Сапрыкин – М.: изд-во АСВ, 1995. – 192 с.
Добромыслов, А.Н. Диагностика повреждений зданий и инженерных сооружений [Текст] / А.Н. Добромыслов. – М.: изд-во АСВ. – МГСУ, 2008. – 304 с.
Мальганов, А.И. Восстановление и усиление строитель-ных конструкцій аварийных и реклонструируемых зданий [Текст]: атлас схем и чертежей / А.И. Мальганов, В.С. Плевков, А.Н. Полищук. – Томск, 1990. – 123 с.
Хило, Е.Р. Усиление строительных конструкцій [Текст] / Е.Р. Хило, Б.С. Попович. – Львов: изд-во при Львовском гос. университете издательского объединения «Вища школа», 1985. – 154 с.
Онуфриев, Н.М. Усиление железобетонных конструкций промышленных зданий и сооружений [Текст] / Н.М. Онуфриев. – М., Л.: Стройиздат, 1965. – 340 с.
Типовой проект ТПР 901-5-045.88 Унифицированные водонапорные башни заводського изготовления (система Рожновского) ёмкостью 15,25,50 м3, высотой опоры 10,12,15,18 м. Альбом 1 [Текст]. – М.:Гипронисельхоз, 1972 – 48 с.
ДСТУ – Н Б В.1.2-18:2016 Настанова щодо обстежен-ня будівель і споруд для визначення та оцінки їх технічно-го стану. – Київ: ДП «УкрНДНЦ», 2017. – 44 с.
Oden, I., Reddy, I. (1976) An introduction to the mathe-matical theory of finite elements. N.Y.: Willey, 256.
Smukler, V.S. (2008) About One Possibility of Compro-mise – Guterion Construction in Structure Parameter Rational-ization Task Dundee. Scotland, 38.
Smukler, V.S. (2005) Evolutionist approach in rationaliza-tion of building structures. ISEC – 03, Third International structural Engineering and construction Conference, Shunan, Japan.
References
DBN В.1.2-14: 2009 (2010) General principles of reliability and structural safety of buildings, structures, building structures and foundations. Kyiv: Miner-hyonstroy of Ukraine, 37.
DSTU BV2.6-156: 2010 (2011) Concrete and reinforced concrete constants from heavy concrete. Design rules. Kyiv: Minregionstroy of Ukraine, 118.
Bedov, A.N., Saprykin, V.F. (1995) Inspection and reconstruction of reinforced concrete and stone structures of operated buildings and structures. Moscow: Publishing House of the DIA, 192.
Dobromyslov, A.N. (2008) Diagnostics of damage to buildings and engineering structures. M.: publishing house of the DIA. - MSSU, 304.
Malganov, A.I., Plevkov, V.S., Polishchuk, A.N. (1990) Restoration and strengthening of building designs of emergency and reconditioned buildings: atlas of schemes and drawings. Tomsk, 123.
Hilo, E.R., Popovich, B.S. (1985) Strengthening of construction constructions. Lviv: Izd-vo in the Lviv state. University of the publishing association "Vishcha school", 154.
Onufriev, N.M. (1965) Strengthening of reinforced concrete structures of industrial buildings and structures. M.,L.: Stroyizdat, 340.
Typical project TPD 901-5-045.88 (1972) Unified water towers factory-made (Rozhnovsky system) with the capacity of 15.25,50 m3, the height of the support 10,12,15,18 m. Album 1. M.: Giproniselhoz, 48.
DSTU-N BV.1.2-18: 2016 (2017) Guidelines for inspection of buildings and structures for the determination and evaluation of their technical condition. Kyiv: UkrNDNTS, 44 .
Oden, I., Reddy, I. (1976) An introduction to the mathe-matical theory of finite elements. N.Y.: Willey, 256.
Smukler, V.S. (2008) About One Possibility of Compro-mise – Guterion Construction in Structure Parameter Rational-ization Task Dundee. Scotland, 38.
Smukler, V.S. (2005) Evolutionist approach in rationaliza-tion of building structures. ISEC – 03, Third International structural Engineering and construction Conference, Shunan, Japan.
Downloads
Published
How to Cite
Issue
Section
License
The authors who publish in this collection agree with the following terms:
• The authors reserve the right to authorship of their work and give the magazine the right to first publish this work under the terms of license CC BY-NC-ND 4.0 (with the Designation of Authorship - Non-Commercial - Without Derivatives 4.0 International), which allows others to freely distribute the published work with a mandatory reference to the authors of the original work and the first publication of the work in this magazine.
• Authors have the right to make independent extra-exclusive work agreements in the form in which they were published by this magazine (for example, posting work in an electronic repository of an institution or publishing as part of a monograph), provided that the link to the first publication of the work in this journal is maintained. .
• Journal policy allows and encourages the publication of manuscripts on the Internet (for example, in institutions' repositories or on personal websites), both before the publication of this manuscript and during its editorial work, as it contributes to the emergence of productive scientific discussion and positively affects the efficiency and dynamics of the citation of the published work (see The Effect of Open Access).
