scholarly journals Probability Distribution of ADAS Metal Dampers in R.C. Buildings Using Nonlinear Analysis: التوزيع الاحتمالي لمخمدات معدنية من نوع ADAS في المباني البيتونية المسلحة باستخدام التحليل اللاخطي

2021 ◽  
Vol 5 (3) ◽  
pp. 148-134
Author(s):  
Hala Tawfek Hasan, Khaled Al-Homsi Hala Tawfek Hasan, Khaled Al-Homsi
Keyword(s):  
Reinforced Concrete ◽  
Probability Distribution ◽  
Reinforced Concrete Structures ◽  
Structural Elements ◽  
Base Shear ◽  
Soft Story ◽  
Controlling Mechanism ◽  
Seismic Shock ◽  
Metallic Dampers ◽  
Negative Impacts

This study discusses the effect of metallic yielding dampers (ADAS) on the behavior of reinforcement concrete buildings when exposed to seismic shocks. The objective of the study is to reduce the negative impacts on the main structural elements (plastic, fall) by using the technique of metallic dampers. The method of metallic dampers is one of the modern ways based on the principle of dissipating the resulting energy from the seismic shock and reducing the needed energy in the main structural elements of the building to keep it in a flexible state. This technique also provides a controlling mechanism for story displacement, the handling of the soft story mechanic and the torsion mechanic of the buildings. In this study, the effect of the addition of ADAS dampers on the construction behavior was observed in terms of (building period, base shear, roof displacement, roof acceleration, story displacement, dissipative energy). Based on the preceding, this study will give the possibility of predicting the behavior of the building when using ADAS metal dampers in the reinforced concrete structures with their distribution methods.

scholarly journals Optimizing of system "column-cfrp lamellas" with the strengthening of civil structures

2021 ◽  
Vol 9 (1) ◽  
pp. 1-5
Author(s):  
Irina Mayackaya ◽  
Batyr Yazyev ◽  
Anastasia Fedchenko ◽  
Denis Demchenko
Keyword(s):  
Reinforced Concrete ◽  
Composite Materials ◽  
Carbon Fiber ◽  
Concrete Structures ◽  
Polymeric Composite ◽  
Concrete Columns ◽  
Reinforced Concrete Structures ◽  
Structural Elements ◽  
Civil Structures ◽  
Concrete Elements

Reinforced concrete elements of structures in the form of columns, beams, ceilings are widely used in the construction of buildings and structures of industrial and civil construction. In most cases, the columns serve as supports for other building elements, for example, crossbars, slabs, girders, beams. One of the cycles of the work of reinforced concrete structures is the state of their repair and reconstruction, including the stages of strengthening the elements. There is a problem of strengthening of reinforced concrete columns. The article deals with the issue of reinforcing columns and other structural elements having a cylindrical surface, with polymeric composite materials in the form of carbon fiber lamellae. The use of composite materials allows to increase the service life and strength of reinforced concrete structures used in construction.

scholarly journals Influence of Superior Vibration Modes on the Seismic Response of Reinforced Concrete Structures with Eigen-Periods Near Code Control Periods

2020 ◽  
Vol 9 (1) ◽  
pp. 108-122
Author(s):  
Savu Adrian-Alexandru
Keyword(s):  
Reinforced Concrete ◽  
Seismic Response ◽  
Seismic Design ◽  
Structural Design ◽  
Control Period ◽  
Three Dimensional ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
Base Shear ◽  
Seismic Design Code

Abstract The current paper studies the effect of superior eigen-modes on the seismic response for a series of reinforced concrete structures having eigen-periods near code control periods. Although the structural design is based on Romanian seismic design codes (“P100-1/2013 - Seismic design code - Part 1 - Design provisions for buildings” and “SR-EN 1998/2004 - Design of structures for earthquake resistance”), it carries some importance for other countries with similar seismic design spectra. A total of twenty-four models for structures were considered by varying their location (through control period values), three-dimensional regularity, overall dimensions and height regime. Results were compared and conclusions were drawn based on percentage values of relative displacements (storey drifts) and base shear forces.

scholarly journals Safety of Formworks in the Engineering and General Construction Sector

2019 ◽  
Vol 1 (1) ◽  
pp. 284-290
Author(s):  
Kinga Brózda ◽  
Jacek Selejdak
Keyword(s):  
Reinforced Concrete ◽  
Occupational Health ◽  
Health And Safety ◽  
Retaining Walls ◽  
General Construction ◽  
Necessary Condition ◽  
Reinforced Concrete Structures ◽  
Structural Elements ◽  
Construction Sector ◽  
Safety Requirements

AbstractFormwork systems are necessarily used in the implementation of the RC (reinforced concrete) structures. Formworks are required regardless of whether a construction is monolithic or prefabricated and used to form the engineering and general structures or structural elements, such as abutments, supports and decks of the bridges, tanks and retaining walls, but also industrial and accommodation facilities etc. Ensuring the OHS (occupational health and safety) during transport, assembly and disassembly of formworks is a necessary condition for the execution of RC works in a safe and economical way. The paper presents the analysis of the safety requirements for formworks. Furthermore, the general requirements for the execution of the formwork structures were discussed. The most common organizational and technological mistakes and cased of neglects related to the operation of the formwork which lead to infringement of the OHS regulations were also identified.

scholarly journals Reinforced concrete corbels strengthened with external prestressing

2019 ◽  
Vol 12 (4) ◽  
pp. 812-831 ◽  
Author(s):  
R. M. ROMANICHEN ◽  
R. A. SOUZA
Keyword(s):  
Reinforced Concrete ◽  
Nonlinear Analysis ◽  
Experimental Results ◽  
Analytical Models ◽  
Reinforced Concrete Structures ◽  
Structural Elements ◽  
Strut And Tie ◽  
External Prestressing ◽  
Strength Capacity ◽  
Strut And Tie Model

Abstract Reinforced concrete structures may demand, throughout their lifetime, the increase of the capacity load due to eventual changes in the load configuration. In this context, corbels could be considered structural elements which present great challenges for installing strengthening solutions. The referred difficulty is due to the fact that the strength capacity of this kind of element is dependent on the strength of a diagonal concrete strut and a tensile steel tie, both located in a very short region also subjected to interferences. In the present paper, the behavior of reinforced concrete corbels strengthened with external prestressing is investigated. For that, nonlinear analysis of short corbels (a/d ratio between 0,5 and 1,0), strengthened or not, have been applied. Also, analytical models based on the Strut-and-Tie Model were developed and the obtained results were compared with experimental results. The obtained results have demonstrated that strengthening reinforced concrete corbels using external prestressing is a fast, efficient and safe solution.

scholarly journals CREEP OF REINFORCED CONCRETE THIN-WALLED STRUCTURES TAKING INTO ACCOUNT REVERSE DEFORMATIONS

2020 ◽  
Vol 6 (159) ◽  
pp. 113-117
Author(s):  
O. Chuprynin ◽  
N. Sereda ◽  
A. Garbuz
Keyword(s):  
Reinforced Concrete ◽  
Material Properties ◽  
Concrete Structures ◽  
Design Stage ◽  
Reinforced Concrete Structures ◽  
Nonlinear Creep ◽  
Structural Elements ◽  
Thin Walled Structures ◽  
Proposed Model ◽  
Thin Walled

One of the main tasks, which is solved at the design stage of the reinforced concrete element, is the analysis of the stress-strain state, as well as the determination of the service life. The article is devoted to modeling of nonlinear creep of reinforced concrete structural elements taking into account damages and return of the creep. The high priority of the research topic is substantiated, the purpose and objectives are formulated. A combination of a plastic model with fracture mechanics is proposed to simulate the behavior of concrete in accordance with its characteristics, including not only stress and deformation, but also the degradation of its stiffness. The resulting equations of state correspond to the law reverse deformations. The finite element method is used to solve the boundary value problem. For the sake of numerical modeling of thin-walled structures, the use of special shell elements is proposed. The mathematical formulation of the problem of creep of reinforced concrete structural elements taking into account anisotropy of material properties and creep deformations and return of the creep is presented. Creep problems of thin-walled structural elements were solved with the help of developed software. Analyzed the deformation of reinforced concrete panel of cylinder. The analysis of the results allows us to judge the effectiveness of the proposed model as a whole. The equation of state reflects the anisotropy of the material properties and takes into account the damage, which allows for a reliable assessment of the strength, stiffness and durability of reinforced concrete structures. Conclusions about the adequacy of the analysis of reliability and durability of reinforced concrete structures using the proposed model.

scholarly journals Possibility of application of concrete sleeper with under sleepers pads

2021 ◽  
Author(s):  
Zvonko Perčin
Keyword(s):  
Reinforced Concrete ◽  
Steel Structures ◽  
Railway Track ◽  
Crushed Stone ◽  
Reinforced Concrete Structures ◽  
Bridge Structure ◽  
The Past ◽  
Railway Infrastructure ◽  
Stone Material ◽  
Negative Impacts

One of the most sensitive segments of the railway infrastructure are certainly bridges. All steel grid bridges have wooden sleeper attached to the bridge structure and cannot change the height when maintaining the upper structure rails. It has become a practice to reconstruct or replace damaged bridges in the past by taking care that the track construction is separated from the bridge constructions. One way is that steel grid structures are replaced with reinforced concrete structures in the form of a trough or if the spans are larger with steel structures in the form of a trough. The standard classical track construction today is a gangway with concrete sleepers and a ballast of crushed stone material. Such tracks have reduced elasticity, which is particularly important at contact between the sleepers and the stone material. In order to reduce the negative impacts of vibration and thus extend the durability of railway track today, railways increasingly apply concrete sleepers with under sleepers pads. Tests have shown that with the installation of the under sleeper pads it is possible to achieve a quieter passage of the train over the substrates of different stiffness, thus reducing the possibility of damage to the track construction and the vehicle itself.

Effects on structures of the Managua earthquake of December 23, 1972

1974 ◽  
Vol 64 (4) ◽  
pp. 1069-1133
Author(s):  
Loring A. Wyllie ◽  
Richard N. Wright ◽  
Mete A. Sozen ◽  
Henry J. Degenkolb ◽  
Karl V. Steinbrugge ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Structural Steel ◽  
Concrete Structures ◽  
Mechanical Equipment ◽  
Reinforced Concrete Structures ◽  
Structural Elements ◽  
Structural Effects ◽  
The City ◽  
Extensive Damage

Abstract The December 23, 1972, earthquake in Managua, Nicaragua caused extensive damage to structures throughout the city of Managua. There was damage to virtually every building in Managua, a city of approximately 400,000 inhabitants. An estimated 10,000 people were killed, mostly in the collapse of homes built of native taquezal construction. The city contained numerous reinforced concrete structures designed to recent standards. Although many of these buildings were heavily damaged, with some collapses, some had only minor damage. There were also several structures of structural steel. The paper provides an overview of structural effects and discusses the performance of selected buildings in Managua illustrating the range of performance of modern construction. Damage to numerous other buildings will be discussed. The paper, while emphasizing the structural effects on buildings, also discusses the performance of non-structural elements, mechanical equipment, etc.

RESTORATION COMPRESSED REINFORCED CONCRETE STRUCTURES BUILDINGS

2013 ◽  
Vol 3 (4) ◽  
pp. 62-67
Author(s):  
N. A IL'IN ◽  
A. A PIShchULEV ◽  
P. N SLAVKIN ◽  
A. P ShEPELEV ◽  
R. R IBATULLIN
Keyword(s):  
Reinforced Concrete ◽  
Thermal Damage ◽  
Thermal Stresses ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
Structural Elements ◽  
Fire Performance ◽  
In Fire

The article describes the main provisions: a method for assessing the severity of thermal damage of compressed reinforced concrete structural elements; methods of reducing residual tensile thermal stresses in compressed working armature element; recommendations for restoring lost in fire performance of compressed elements of reinforced concrete structures of buildings and installations.

NON-DESTRUCTIVE APPROACH TO THE BOLT JOINTS QUALITY CONTROL

2020 ◽  
pp. 37-42
Author(s):  
N. V. Mikhalevich ◽  
O. S. Plotnikova
Keyword(s):  
Quality Control ◽  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Experimental Research ◽  
Bolted Joints ◽  
Reinforced Concrete Structures ◽  
Structural Elements ◽  
Bolted Connections ◽  
Non Destructive ◽  
Destructive Methods

Bolted connections are often used to connect structural elements in steel, wood and reinforced concrete structures. In structural inspecting, there is often no marking on bolted joints. So, it is necessary to determine the bolt strength to assess the bolt joint bearing capacity. The bolt strength can be determined by destructive and non-destructive methods. The article presents the experimental research to determine the bolt strength using the scratch method and compares the results with the destructive method (bolt breaking).

THE USE OF DAMPER SYSTEMS IN BUILDINGS WITH REINFORCED CONCRETE STRUCTURES

2019 ◽  
Vol 7 ◽  
pp. 912-919
Author(s):  
Naima Ezzaki ◽  
Daniel Stoica ◽  
Laurentiu Rece ◽  
Amelitta Legendi
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structure ◽  
Elastic Field ◽  
Structural Safety ◽  
Reinforced Concrete Structures ◽  
Alternative Possibility ◽  
Structural Elements ◽  
Reinforced Concrete Structure ◽  
Linear Elastic ◽  
Safety Enhancement

This study aims to emphasize, by means of a comparative study, the efficiency of some damper systems as modern variants of consolidation / seismic structural safety enhancement used for buildings with reinforced concrete structure designed and erected according to the P13-type standards (from 1963) and considering this as an alternative possibility instead of retrofitting with reinforced concrete jackets (with significant implications for most of the structural elements at all levels of buildings). Damper devices are elements that can be easily replaced later in case of damage. Case studies were made, based on structural calculations in the linear elastic field, using the ETABS program.

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