scholarly journals DEFECTS AND DAMAGES OF METAL COLUMNS OF INDUSTRIAL BUILDINGS

2021 ◽  
Vol 9 (2) ◽  
pp. 11-15
Author(s):  
Sergej Evtushenko ◽  
Timofey Krakhmalnyy
Keyword(s):  
Reinforced Concrete ◽  
Defect Formation ◽  
Concrete Columns ◽  
Technical Condition ◽  
Rail Transport ◽  
Automated System ◽  
Building Structures ◽  
Transport Equipment ◽  
Reinforced Concrete Columns ◽  
Industrial Buildings

This article is a continuation of the series of articles by the authors about the characteristic defects and damage to the building structures of industrial buildings. In earlier articles, there were descriptions of defects in ground foundations, damage to foundations, as well as arti-cles about damage to reinforced concrete columns and facades. The article presents a sys-tematization of defects and damage to metal columns of industrial buildings, based on the analysis of the results of the survey of many objects. The possible consequences of the de-velopment of the identified defects and damages are described. Recommendations for the assessment of the technical condition of damaged structures and recommendations for the elimination of identified defects and damage are given. The unique damages associated with the operation of lifting and transport equipment, road and rail transport are also given. The article concludes with an analysis of the characteristic zones of defect formation in the met-al columns of buildings for the created automated system for monitoring the state of indus-trial facilities.

scholarly journals DEFECTS AND DAMAGES OF REINFORCED CONCRETE COLUMNS OF INDUSTRIAL BUILDINGS

2020 ◽  
Vol 8 (2) ◽  
pp. 5-10
Author(s):  
Timofey Krakhmalnyy ◽  
Sergej Evtushenko
Keyword(s):  
Reinforced Concrete ◽  
Defect Formation ◽  
Concrete Columns ◽  
Building Structures ◽  
Reinforced Concrete Columns ◽  
Industrial Buildings

This article is a continuation of the authors ' series of articles on defects and damage to building structures of industrial buildings. This article presents typical defects and damages of precast and monolithic reinforced concrete columns of industrial buildings. The possible reasons for the formation of typical defects, the consequences of which may lead to their development, are considered, and recommendations for the elimination of identified damages are given. In conclu-sion, the article analyzes the characteristic zones of defect formation in rein-forced concrete columns of buildings in accordance with the method proposed earlier by the authors.

scholarly journals DEFECTS AND DAMAGES OF METAL CRANE BEAMS OF INDUSTRIAL BUILDINGS

2021 ◽  
Vol 9 (3) ◽  
pp. 11-15
Author(s):  
Timofey Krakhmalnyy ◽  
Sergej Evtushenko
Keyword(s):  
Control System ◽  
Life Cycle ◽  
Reinforced Concrete ◽  
Defect Formation ◽  
Concrete Columns ◽  
Industrial Building ◽  
Automated Control ◽  
Automated Control System ◽  
Industrial Buildings ◽  
Wall Panels

The article provides an analysis of typical and unique defects and damages of crane beams, which is a continuation of the series of articles by the authors about defects and damages of industrial buildings. Previously, articles on typical defects of industrial buildings have already been published: ground bases, foundations, reinforced concrete columns, metal columns, vertical connections and wall panels. Most of the defects are explained by photos. At the end of the article, an analysis of the characteristic zones of defect formation in the metal crane beams of industrial buildings is given, which allows laying the foundation for the development of an automated control system (ACS) for the life cycle of an industrial building.

scholarly journals STRUCTURES OF THE HIGH-RISE BUILDING “LAKHTA CENTER” IN SAINT-PETERSBURG

2019 ◽  
Vol 15 (3) ◽  
pp. 14-39
Author(s):  
Elena Lyukhina ◽  
Sergey Lakhman ◽  
Alexey Miller ◽  
Vladimir Travush
Keyword(s):  
Reinforced Concrete ◽  
Health Monitoring ◽  
Concrete Columns ◽  
Building Structures ◽  
Underground Part ◽  
Reinforced Concrete Columns ◽  
Steel Reinforced Concrete ◽  
Saint Petersburg ◽  
High Rise ◽  
Geological Research

The “Lakhta Center” skyscraper that built up in Saint-Petersburg on the coast of Baltic sea at the end of 2018 is the highest building of Europe. The tower has 87 floors above the ground and 2 underground floors. The distinctive paper is devoted to structures of this skyscraper. Particularly piled foundation, building structures of the underground part (substructure), building structures of the aboveground part (building superstructure), de­signs of steel-reinforced concrete columns, design of slabs, structural analysis, some loads and impacts, aerody­namic tests, engineering-geological research, testing of steel-reinforced concrete columns, glass racks and struc­tural health monitoring are under consideration.

SETTING A DIAGRAM APPROACH TO CALCULATING VIBRATED, CENTRIFUGED AND VIBROCENTRIFUGED REINFORCED CONCRETE COLUMNS WITH A VARIATROPIC STRUCTURE

2020 ◽  
pp. 22-34
Author(s):  
Л. Р. Маилян ◽  
С. А. Стельмах ◽  
Е. М. Щербань ◽  
М. П. Нажуев
Keyword(s):  
Experimental Data ◽  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Cross Section ◽  
Concrete Columns ◽  
Reinforced Concrete Columns ◽  
The Cross ◽  
Concrete Elements ◽  
Diagram Approach

Состояние проблемы. Железобетонные элементы изготавливаются, как правило, по трем основным технологиям - вибрированием, центрифугированием и виброцентрифугированием. Однако все основные расчетные зависимости для определения их несущей способности выведены, исходя из основного постулата - постоянства и равенства характеристик бетона по сечению, что реализуется лишь в вибрированных колоннах. Результаты. В рамках диаграммного подхода предложены итерационный, приближенный и упрощенный способы расчета несущей способности железобетонных вибрированных, центрифугированных и виброцентрифугированных колонн. Выводы. Расчет по диаграммному подходу показал существенно более подходящую сходимость с опытными данными, чем расчет по методике норм, а также дал лучшие результаты при использовании дифференциальных характеристик бетона, чем при использовании интегральных и, тем более, нормативных характеристик бетона. Statement of the problem. Reinforced concrete elements are typically manufactured according to three basic technologies - vibration, centrifugation and vibrocentrifugation. However, all the basic calculated dependencies for determining their bearing capacity were derived using the main postulate, i.e., the constancy and equality of the characteristics of concrete over the cross section, which is implemented only in vibrated columns. Results. Within the framework of the diagrammatic approach, iterative, approximate and simplified methods of calculating the bearing capacity of reinforced concrete vibrated, centrifuged and vibrocentrifuged columns are proposed. Conclusions. The calculation according to the diagrammatic approach showed a significantly better convergence with the experimental data than that using the method of norms, and also performs better when using differential characteristics of concrete than when employing integral and particularly standard characteristics of concrete.

Experimental Study on the Effect of Moisture Content on Hysteretic Behavior of Reinforced Concrete Columns

2018 ◽  
Vol 12 (1) ◽  
pp. 47-61
Author(s):  
Wenjuan Lv ◽  
Baodong Liu ◽  
Ming Li ◽  
Lin Li ◽  
Pengyuan Zhang
Keyword(s):  
Reinforced Concrete ◽  
Energy Dissipation ◽  
Moisture Content ◽  
Early Stage ◽  
Damping Ratio ◽  
Concrete Columns ◽  
Hysteretic Behavior ◽  
Cyclic Test ◽  
Experimental Result ◽  
Reinforced Concrete Columns

Background: For reinforced concrete structures under different humid conditions, the mechanical properties of concrete are significantly affected by the moisture content, which may result in a great change of the functional performance and bearing capacity. Objective: This paper presents an experiment to investigate the influence of the moisture content on the dynamic characteristics and hysteretic behavior of reinforced concrete column. Results: The results show that the natural frequency of reinforced concrete columns increases quickly at an early stage of immersion, but there is little change when the columns are close to saturation; the difference between the natural frequencies before and after cyclic test grows as the moisture content rises. The damping ratio slightly decreases first and then increases with the increase of moisture content; the damping ratio after the cyclic test is larger than before the test due to the development of the micro-cracks. Conclusion: The trend of energy dissipation is on the rise with increasing moisture content, although at an early stage, it decreases slightly. According to the experimental result, a formula for the moisture content on the average energy dissipation of reinforced concrete columns is proposed.

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