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 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 Calculation of PVC windows for wind loads in high-rise buildings

2018 ◽  
Vol 33 ◽  
pp. 02025 ◽  
Author(s):  
Aleksandr Konstantinov ◽  
Maya Lambias Ratnayake
Keyword(s):  
Analytical Method ◽  
Calculation Method ◽  
Laboratory Experiments ◽  
Wind Loads ◽  
Statistical Characteristics ◽  
Statistical Calculation ◽  
Load Bearing ◽  
High Rise ◽  
The Impact ◽  
Window Design

In the following article we examine problems faced when designing PVC windows for high-rise buildings, which are usually not considered when constructing objects for massive sites, using a high-rise residential complex as an example. We address the matters related to wind loads on windows & statistical calculation of the impact of wind loads on them. We have presented variants of installing load-bearing elements of PVC windows which accept wind loads. We conducted a laboratory experiment by simulating wind loads on the window design, which is actually used for glazing the examined high-rise building. In the course of the experiment we determined additional factors which need to be considered when constructing PVC window structures for glazing high-rise buildings. We can determine that the following calculation method for the impact of wind load on PVC windows gives higher values of the desired statistical characteristics of load-bearing elements of a window compared to the results of laboratory experiments. We provide prerequisites to improve the analytical method of calculating impact of wind loads on load-bearing elements of PVC windows.

Impact-Resistant Analysis of Hinged Reinforced Concrete Beam with Composite Laminates

2014 ◽  
Vol 501-504 ◽  
pp. 1000-1003
Author(s):  
Run Lin Yang ◽  
Jie Kong ◽  
Juan Hua Zhou
Keyword(s):  
Reinforced Concrete ◽  
Composite Laminates ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Impact Loads ◽  
Building Structures ◽  
Structural Members ◽  
Composite Measure ◽  
Protective Measures ◽  
The Impact

Under the impact loads, once the key load-bearing member is damaged, it will endanger the entire building structures. Hence, it is very important to study impact-resistant performance of structural members. In order to verify effectiveness of a new composite protective device proposed in the earlier time, a reinforced concrete beam hinged at both ends was choosen as the observed object. During the process of numerical simulation, the four different protective measures including the unprotected, the rigid, the flexible and the composite one were considered in sequence. Numerical results show that the proposed composite measure can achieve the best protective effect, and it may be considered as a new option for impact-resistant protection of structural memebers.

Narrow Reinforced Concrete Slabs after their Flexural Destruction

2014 ◽  
Vol 969 ◽  
pp. 271-275 ◽  
Author(s):  
Mirosław Wieczorek
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
The Self ◽  
Concrete Slabs ◽  
Building Structures ◽  
Reinforcing Steel ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Horizontal Shift ◽  
Reinforced Concrete Slabs

In the course of the exploitation of building structures frequently situations turn up, in which the structure is not adequately used (it may, for instance, be exposed to considerably greater loads than previously been intended). In the state of an unforeseen overload of the structure, essential reserves of their load-bearing capacity may be disclosed in the case of the self-acting work as a flexible strand. The paper presents the results of investigations concerning the influence of the parameters of reinforcing steel on the mechanism of the destruction of six single-span models of narrow reinforced concrete slabs, in which a horizontal shift of the supports was not possible. The tests were carried out on narrow slabs with the dimensions 3860×480×100 mm. The results of the tests were compared with analytical calculations.

scholarly journals Impact of the fire on the bearing capacity of the ordinary concrete used in reinforced concrete structures in Burundi. History and architecture

Vestnik MGSU ◽  
2021 ◽  
pp. 1567-1572
Author(s):  
Emmanuel Mikerego ◽  
Donatien Nduwimana
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Negative Impact ◽  
Heating Temperature ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Ordinary Concrete ◽  
The Impact

Introduction. This paper presents the results of an assessment of the impact of fire on the bearing capacity of the ordinary concrete, to be taken into account in the rehabilitation of fire-damaged reinforced concrete structures in Burundi. Materials and methods. Experimental samples of the ordinary concrete made respectively of coarse river aggregates and crushed coarse quarry aggregates were prepared and subjected to different heating temperatures (250, 350, 450, 600 and 900 °C) simulating the fire. After natural cooling, experimental samples were subjected to compression test; and diagrams showing the loss of the load-bearing capacity of the ordinary concrete used in reinforced concrete structures in Burundi were drawn. Results. Negative impact of the fire on the load-bearing capacity of the ordinary concrete occurs above of 350 °C of heating temperature. Concrete made of crushed coarse quarry aggregates loses 50 and 78 % of its bearing capacity at around 525 and 900 °C of heating temperature, respectively. Similarly, concrete made of coarse river aggregates loses 50 and 70 % of its load-bearing capacity respectively at 600 and 900 °C of heating temperature. An evaluation curve of the after-fire bea­ring capacity of the concrete used in reinforced concrete structures in Burundi is established. Conclusions. The negative impact of the fire on the load-bearing capacity of the ordinary concrete occurs above of 350 °C of heating temperature. Concretes made of crushed coarse quarry aggregates and concrete made of coarse river aggregates lose 50 % of its bearing capacity at around 525 and 600 °C of heating temperature respectively. Knowing the heating temperature that the fire-damaged reinforced concrete structure has undergone is indispensable in deciding on its demolition or rehabilitation.

High-rise building analysis considering construction stages: floor structure stiffness influence over vertical element axial shortening

2021 ◽  
Author(s):  
Raina Boiadjieva
Keyword(s):  
Building Materials ◽  
Tall Buildings ◽  
Design Stage ◽  
Building Structures ◽  
Vertical Load ◽  
Load Bearing ◽  
Normal Forces ◽  
Floor Structure ◽  
The Impact ◽  
Axial Shortening

<p>The studies of building structures accounting construction stages considered the optimization of embedded materials both at the design stage and at the construction stage. Axial shortening of the vertical load-bearing elements under the effect of gravitational loads and due to the characteristics of the building materials is an important point of structural analysis of tall buildings that should be considered. The present study analyzes the influence of the floor structure stiffness and the vertical load-bearing element / floor structure connection over the axial shortening of walls and columns which affects the distribution of normal forces in them. A computational model of a building structure with simplified geometry and loads is considered to emphasize the impact of the stiffness of the floor structure. The results of the solution of several variants of calculation models are compared. Generalized conclusions are given in the end.</p>

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.

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.

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