scholarly journals Conducting experimental investigations of wind influence on high-rise constructions

2018 ◽  
Vol 33 ◽  
pp. 02067 ◽  
Author(s):  
Olga I. Poddaeva ◽  
Anastasia N. Fedosova ◽  
Pavel S. Churin ◽  
Julia S. Gribach
Keyword(s):  
Aerodynamic Drag ◽  
Experimental Investigations ◽  
Building Structures ◽  
High Rise ◽  
Aerodynamic Pressure ◽  
Stage Of Development ◽  
Wind Influence ◽  
Under Construction ◽  
Building Designs ◽  
The Impact

The design of buildings with a height of more than 100 meters is accompanied by strict control in determining the external loads and the subsequent calculation of building structures, which is due to the uniqueness of these facilities. An important factor, the impact of which must be carefully studied at the stage of development of project documentation, is the wind. This work is devoted to the problem of studying the wind impact on buildings above 100 meters. In the article the technique of carrying out of experimental researches of wind influence on high-rise buildings and constructions, developed in the Educational-research-and-production laboratory on aerodynamic and aeroacoustic tests of building designs of NRU MGSU is presented. The publication contains a description of the main stages of the implementation of wind tunnel tests. The article presents the approbation of the methodology, based on the presented algorithm, on the example of a high-rise building under construction. This paper reflects the key requirements that are established at different stages of performing wind impact studies, as well as the results obtained, including the average values of the aerodynamic pressure coefficients, total forces and aerodynamic drag coefficients. Based on the results of the work, conclusions are presented.

scholarly journals INFLUENCE OF POINT HEIGHT CONSTRUCTION ON AERODYNAMIC CHARACTERISTICS OF EXISTING BUILDINGS

2019 ◽  
Author(s):  
Olga I. Poddaeva ◽  
Oleg O. Egorychev ◽  
Zhanna I. Nagornova
Keyword(s):  
Wind Load ◽  
Experimental Modeling ◽  
Building Structures ◽  
Aerodynamic Coefficients ◽  
Existing Building ◽  
High Rise ◽  
Aerodynamic Pressure ◽  
Stage Of Development ◽  
Bioclimatic Comfort ◽  
The Impact

Introduction. The article is devoted to the description of the method of experimental modeling of wind effects on buildings and structures located in dense urban areas. The relevance of the research topic is explained by the increase in the density of urban development in large cities, as well as the tendency to the point construction of high-rise buildings in areas with existing low-rise, historical buildings. Materials and methods. Experimental modeling in a wind tunnel is considered as a research method. Studies were conducted on a reduced geometrically similar model of the real object. As measuring equipment was used the research system, which based on differential strain-gauge pressure sensors. The results of experimental studies are presented in the form of dimensionless aerodynamic pressure coefficients. The object under study is a building consisting of three non-high-rise and one designed high-rise buildings. In order to assess the impact of the designed building on the wind load on the existing building structures, three different schemes of their location were considered. Results. Parameters of wind load (aerodynamic coefficients) on existing building structures were determined and exponential graphs of the dependence of the average values of the aerodynamic coefficients on the location of the height structure and the angle of attack of the incident air flow were constructed. Conclusions. The results of the research suggest a significant decrease in the average wind load on the buildings of the existing building when the high-rise building is located near it, which indicates the beneficial effect of this arrangement of buildings on the aerodynamic situation of the area in terms of wind load on the buildings themselves. Nevertheless, at the stage of development of project documentation for each such facility, it is recommended to conduct comprehensive studies, where, in addition to the wind load, the impact of the designed structures on the aeration and bioclimatic comfort of the development area will be assessed.

Experimental investigation of the aerodynamic drag of roof-mounted insulators for trains

2019 ◽  
Vol 234 (8) ◽  
pp. 834-846
Author(s):  
Jonathan Tschepe ◽  
Jörg-Torsten Maaß ◽  
Christian Navid Nayeri ◽  
Christian Oliver Paschereit
Keyword(s):  
Boundary Conditions ◽  
Energy Demand ◽  
High Speed ◽  
Aerodynamic Drag ◽  
Aerodynamic Resistance ◽  
Reynolds Numbers ◽  
Experimental Investigations ◽  
Flexible Material ◽  
High Speed Trains ◽  
The Impact

This paper presents the results of experimental investigations on the aerodynamic drag of roof-mounted insulators for use on low- and high-speed trains. Wind tunnel investigations at different Reynolds numbers in the subcritical, critical, and supercritical flow regime were performed, in addition to investigations using wall-mounted cylinders. Furthermore, the impact of insulator sheds made of flexible material was analyzed. For a better understanding of the aerodynamic behavior of the insulators when mounted on trains, different boundary conditions representing realistic configurations as found on the roof of trains were simulated. From the measured drag, the energy demand to overcome the aerodynamic resistance of different types of insulators was calculated. Depending on the above mentioned boundary conditions, a noticeable contribution of the insulators to the entire train's aerodynamic drag could be observed. With flexible insulator sheds, a further increased air resistance was observed with the onset of fluttering. Similar to the cylinder, the aerodynamic behavior of the insulators depends on the respective Reynolds number.

scholarly journals Evaluation of risk and safety in building structures under construction

2020 ◽  
Vol 1 (4) ◽  
pp. 24-28
Author(s):  
Shahram Jkhsi
Keyword(s):  
Structural Defects ◽  
Building Structures ◽  
The Past ◽  
Structural Problems ◽  
Building Systems ◽  
Structural Engineer ◽  
Predictive Risk ◽  
Under Construction ◽  
The Individual ◽  
The Impact

Many of the structural defects in the past have happened during the project development process. While a structural engineer must build a safe, economic and functional structure, the durability of the partially constructed structure cannot be ignored at various construction levels. During the building, structural health is a major problem for the industry of construction. Collapses of temporary structures or unfinished permanent structures pose a hazard to safety. Predictive risk analysis methods have been applied over the past decade to evaluate the efficiency of the current existing structural building framework. Identification of risks is aimed at recognizing possible risks that can result in accidents. It describes the types of hazards and random parameters connected with the individual risks and subsequent incidents. The quantifying risk values identified with building structures built according to uniform rules are widely distributed. This study provided importance to a conversation about risk and safety in building structures under construction, to build buildings without damage and destroying, also steps of safety in building structures. The outcome of the project depends on the specifics of the prescription. Building structure safety may lead to big problems if subjected to those loads such as earthquakes and storms. A lot of structural problems happen during construction. Most failures were related to a malfunction in the formwork. This study describes how building systems can carry risks to buildings, as well as resisting the impact of loads that could cause trouble.

scholarly journals Resistance to the destruction of concrete in constructions of height buildings at dynamic loads

2018 ◽  
Vol 33 ◽  
pp. 02042
Author(s):  
Mikhail Berlinov ◽  
Marina Berlinova ◽  
Alexandr Tvorogov
Keyword(s):  
Reinforced Concrete ◽  
Landing Site ◽  
Irreversible Thermodynamic ◽  
Building Structures ◽  
Load Bearing ◽  
High Rise ◽  
Damped Oscillations ◽  
Strength And Durability ◽  
The Impact ◽  
Shock Impacts

The analysis of the criterion of strength of concrete in structures of high-rise buildings under vibration and shock impacts is presented. The idea of an energy approach to ensuring the strength of concrete and the durability of building structures from reinforced concrete under the influence of shock impacts on the life of such structures is presented in a high-rise construction. A method for determining the strength and durability of concrete in load-bearing building structures made of reinforced concrete for irreversible thermodynamic processes has been developed. Dependences that determine the behavior of concrete in reinforced concrete structures of high stores on the load-bearing structures of a building under the influence of damped oscillations from the operation of air transport on the landing site are determined, taking into account the impact arising from its landing.

scholarly journals Calculating the accuracy of strain observations of high-rise buildings and structures using electronic total stations

2020 ◽  
Vol 164 ◽  
pp. 02022
Author(s):  
Vladimir Simonjan ◽  
Svetlana Shendyapina
Keyword(s):  
Physical Condition ◽  
Important Task ◽  
Building Structures ◽  
Life Activity ◽  
Design Performance ◽  
High Rise ◽  
Vertical Displacements ◽  
The Impact

The most important task related to the life activity of people and their safety is the monitoring of buildings and structures. The purpose of monitoring is to identify the degree of physical condition of building structures, the impact of various factors on their physical condition and design performance. Geodetic observations of horizontal and vertical displacements of buildings and structures are most common. They are the most important part of geodetic monitoring. Underestimating the importance of monitoring or not doing so in order to save money leads to tragic consequences. Therefore, the article deals with the accuracy of observations of horizontal and vertical displacements of high-rise buildings and structures using electronic total stations.

scholarly journals Comparability of estimates of the impact of gunpowder and gas-dynamic explosions on the stability of buildings and structures

2021 ◽  
Vol 264 ◽  
pp. 02044
Author(s):  
Rasul Tojiev ◽  
Elmurad Yunusaliev ◽  
Ibrahim Abdullaev
Keyword(s):  
Detonation Wave ◽  
Wave Energy ◽  
Field Experiments ◽  
General View ◽  
Building Structures ◽  
Detonation Tube ◽  
The Stability ◽  
Under Construction ◽  
The Impact ◽  
Theoretical Foundations

A brief description of natural and artificial influences influencing the stability of buildings and structures is presented. Studying the seismic resistance of buildings and structures designed, under construction, erected, and in operation requires time to wait for seismic activity, which is not permissible; costs of manpower and resources, which is inappropriate. In this regard, a working hypothesis has been put forward that by artificially acting on soils with the help of detonation wave energy, it will be possible to induce vibrations, with the help of which it will be possible to study the behavior of building structures put into operation, the entire building and structure as a whole. The goal is set: - to investigate the behavior of structures under construction and in the operation of buildings and structures that perceive artificial vibrations caused by the detonation unit by acting on soils. To achieve this goal, tasks have been identified. A detonation (blast) wave is taken as a "tool" for force action. The theoretical foundations of the experiment are briefly presented and the developed scheme of a detonation tube and a shock wave with a general view of the installation causing detonation wave energy. A brief technique for carrying out field experiments is presented.

Problems of Implementation of an Import Substitution Policy in the Oil Industry

2019 ◽  
pp. 50-57
Author(s):  
Yu. V. Vertakova ◽  
A. S. Evtyukhin
Keyword(s):  
Import Substitution ◽  
Oil Industry ◽  
Investment Climate ◽  
Scientific Publications ◽  
Stage Of Development ◽  
Current Economic Situation ◽  
Negative Effect ◽  
Substitution Policy ◽  
Investment Process ◽  
The Impact

The presented study addresses the issues of implementation of an import substitution policy in the Russian oil industry. Support of domestic production is a key objective specified in the message of the President of the Russian Federation in 2019. In light of the current economic situation and considering the importance of the oil industry for the Russian economy, an import substitution policy could help achieve the objective set by the President.Aim. The study aims to identify the problems and ways of implementation of an import substitution policy in the Russian oil industry.Tasks. The authors analyze scientific publications on import substitution and the state of the Russian oil industry at the current stage of development; determine the directions and fundamental trends in the development of the oil industry; identify obstacles that hinder the implementation of an import substitution policy in the oil industry; describe conditions that facilitate the development of the  investment process in the oil industry; propose comprehensive methods and ways to intensify investments and optimize costs for enterprises in the oil industry.Methods. This study uses general scientific methods of cognition, comparative and statistical analysis to identify problems in the implementation of an import substitution policy in the oil industry.Results. Examination of the current state and development prospects of the oil industry allows the authors to identify obstacles to the development of import substitution. The study shows their impact on the potential of import substitution, which has a negative effect on the prospects of intensification of investment processes, and proposes comprehensive methods and mechanisms that could neutralize the impact of the identified obstacles, thus facilitating the formation of a positive investment climate. Conclusions. Investment climate is shown to have a decisive impact on the potential of import substitution in the Russian oil industry, and ways of overcoming negative trends in the development of the oil industry are proposed.

Assessing the effect of night ventilation on PCM performance in high-rise residential buildings

2019 ◽  
Vol 43 (3) ◽  
pp. 229-249 ◽  
Author(s):  
Shahrzad Soudian ◽  
Umberto Berardi
Keyword(s):  
Thermal Energy ◽  
Phase Change Materials ◽  
Positive Impact ◽  
Residential Buildings ◽  
Solidification Rate ◽  
Operative Temperature ◽  
High Rise ◽  
Ventilation Strategies ◽  
Night Ventilation ◽  
The Impact

This article investigates the possibility to enhance the use of latent heat thermal energy storage (LHTES) as an energy retrofit measure by night ventilation strategies. For this scope, phase change materials (PCMs) are integrated into wall and ceiling surfaces of high-rise residential buildings with highly glazed facades that experience high indoor diurnal temperatures. In particular, this article investigates the effect of night ventilation on the performance of the PCMs, namely, the daily discharge of the thermal energy stored by PCMs. Following previous experimental tests that have shown the efficacy of LHTES in temperate climates, a system comprising two PCM layers with melting temperatures selected for a year-around LHTES was considered. To quantify the effectiveness of different night ventilation strategies to enhance the potential of this composite PCM system, simulations in EnergyPlusTM were performed. The ventilation flow rate, set point temperature, and operation period were the main tested parameters. The performance of the PCMs in relation to the variables was evaluated based on indoor operative temperature and cooling energy use variations in Toronto and New York in the summer. The solidification of the PCMs was analyzed based on the amount of night ventilation needed in each climate condition. The results quantify the positive impact of combining PCMs with night ventilation on cooling energy reductions and operative temperature regulation of the following days. In particular, the results indicate higher benefits obtainable with PCMs coupled with night ventilation in the context of Toronto, since this city experiences higher daily temperature fluctuations. The impact of night ventilation design variables on the solidification rate of the PCMs varied based on each parameter leading to different compromises based on the PCM and climate characteristics.

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