scholarly journals Use of formwork systems in high-rise construction

2018 ◽  
Vol 33 ◽  
pp. 03026
Author(s):  
Oksana Kurakova
Keyword(s):  
Reinforced Concrete ◽  
Construction Project ◽  
Time Frame ◽  
Poor Quality ◽  
Labor Intensity ◽  
Construction Time ◽  
High Rise ◽  
Before And After ◽  
Conventional Technology ◽  
Construction Organization

Erection of high quality buildings and structures within a reasonable time frame is the crucial factor for the competitiveness of any construction organization. The main material used in high-rise construction is insitu reinforced concrete. The technology of its use is directly related to the use of formwork systems. Formwork systems and formwork technologies basically determine the speed of construction and labor intensity of concreting operations. Therefore, it is also possible to achieve the goal of reducing the construction time and labor intensity of works performed by improving the technology of formwork systems use. Currently there are unresolved issues in the area of implementation of monolithic technology projects, and problems related to the selection of a formwork technology, high labor intensity of works, poor quality of materials and structures, etc. are the main ones. The article presents organizational and technological measures, by means of which introduction it is possible to shorten the duration of construction. A comparison of operations performed during formwork installation according to the conventional technology and taking into account the implemented organizational and technological measures is presented. The results of a comparative analysis of economic efficiency assessments are also presented on the example of a specific construction project before and after the implementation of the above mentioned measures. The study showed that introduction of the proposed organizational and technological model taking into account optimization of reinforcing and concreting works significantly improves the efficiency of a high-rise construction project. And further improvement of technologies for the use of insitu reinforced concrete is a promising direction in the construction of high-rise buildings.

Evaluation of the structural damage of high-rise reinforced concrete buildings using ambient vibrations recorded before and after damage

2015 ◽  
Vol 45 (2) ◽  
pp. 213-228 ◽  
Author(s):  
Hirotoshi Uebayashi ◽  
Masayuki Nagano ◽  
Takenori Hida ◽  
Takehiko Tanuma ◽  
Mitoshi Yasui ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Structural Damage ◽  
Ambient Vibrations ◽  
Reinforced Concrete Buildings ◽  
Concrete Buildings ◽  
High Rise ◽  
Before And After

scholarly journals Innovative construction technology for the development of urban space

2018 ◽  
Vol 170 ◽  
pp. 01104
Author(s):  
Oksana Kurakova
Keyword(s):  
Reinforced Concrete ◽  
Urban Space ◽  
Negative Impact ◽  
Organizational Management ◽  
Time Frame ◽  
Construction Technology ◽  
Concrete Technology ◽  
Construction Time ◽  
Concrete Construction ◽  
Labor Resources

The use of innovative technologies in construction contributes to the development of the urban environment. Reduction of construction time allows more intensive development of the territory, as well as to reduce the period of inconvenience to citizens associated with construction. Such intensification is possible due to the development of organizational and technological concepts aimed at reducing the time of finished products output while ensuring their high quality and efficient use of all types of resources involved in the construction process. So, the achieved results in the field of introduction of continuous-flow type of operation, reducing work labor input and increasing the intensity of labor have created a high potential for cast-in-place construction of buildings at a speed comparable with the use of prefabricated reinforced concrete technology. Despite this, the analysis of various situations connected with the cast-in-place reinforced concrete construction has shown that in most cases, the actual investment period completion dates for such projects take much longer than planned. This fact has a very negative impact on the cost of construction. A characteristic feature of the cast-in-place reinforced concrete construction is the circumstance that such a situation can be observed even at an advanced level of organizational management when the conditions for the continuity of supplies of materials, highly mechanized work and the scheduled provision of the production process with qualified labor resources are held. The comprehensive analysis conducted during the research of the organization of construction showed that an essential drawback of modern approaches to the organizational management in the case of cast-in-place construction is the excessive conservatism of methods that does not ensure the proper speed of making managerial decisions in the event of deviations in execution of certain works. The author conducted and presents an analysis of the factors influencing the efficiency of high-rise construction. Зresented directions of further actions to improve the efficiency of construction and reduce its time frame.

scholarly journals Improving the Efficiency of Construction of High-Rise Monolithic Reinforced Concrete Buildings with the Introduction of Innovative Technologies and Technologies

2018 ◽  
Vol 7 (3.2) ◽  
pp. 107
Author(s):  
S A.Farzaliyev ◽  
. . ◽  
. .
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
Labor Costs ◽  
Reinforced Concrete Buildings ◽  
Construction Time ◽  
Concrete Buildings ◽  
High Rise ◽  
Technological Efficiency ◽  
The Cost

Innovations' application of techniques and technologies to modern construction production, along with the reduction of manual labor, also boosts its technical and economic performance. Construction production is one of the fields in the country that plays the most important role and reflects the dynamics of the development of the economy in itself.  In our country, the issue of organizing a cheap housing market has an importance among  a number of socio-economic issues. The programmes adopted in this direction and the initiatives  dealing with the improvement of housing conditions for people from a number of categories are evident proof of this. And this, in its  turn, requires the solution of a number of organizational and technological problems of construction work carried out by monolithic reinforced concrete structures before both the designers and builders. The article explores the ways of timely commissioning of high-rise monolithic reinforced concrete buildings, improving the organization of work, and increasing the technological efficiency to reduce the cost of construction products. It was determined that during the reinforcement of monolithic reinforced concrete structures, automation of works will reduce labor costs, material consumption, product cost and construction time, while technological efficiency is increasing.  

scholarly journals Seismic Behaviour of Rc Building Located in Erbil, Iraq and Strengthening by Using Steel Frame Sections Precast Bolt-Connected Steel-Plate Reinforced Concrete

2022 ◽  
Vol 961 (1) ◽  
pp. 012012
Author(s):  
S F Sadeq ◽  
B R Muhammad ◽  
A J Al-Zuheriy
Keyword(s):  
Reinforced Concrete ◽  
Seismic Performance ◽  
Steel Plate ◽  
Deformation Mode ◽  
Original Structure ◽  
Seismic Behaviour ◽  
Construction Time ◽  
Rc Structures ◽  
Seismic Displacement ◽  
Before And After

Abstract This paper present outside strengthening with precast substructures, is a relatively new retrofitting approach that has recently attracted the attention of researchers. Outside strengthening with precast substructure, in contrast to member-level strengthening technologies (e.g., FRP strengthening, enlarging member section areas, and replacing rebars), is a structure-system reinforcement method that integrates the substructure and the original structure, improves overall seismic performance, and changes the deformation mode of the entire structure. The seismic capability of the exterior strengthening with precast bolt-connected steel-plate reinforced concrete is critically evaluated in this paper (PBSPC) Case studies are used to demonstrate the working principles, numerical methodologies, and design approaches. The simulation results were similar with prior studies, demonstrating that the numerical model was effective. The use of building steel representations reduces construction time, increases efficiency, and lowers costs. The goal of this technology is to lower the seismic displacement demand of nonductile. Current RC structures have steel frames connecting to the building floors. These frameworks run parallel to the structure of the building. Ganjan Life City, a building in Erbil, Iraq, is being used as a case study. The ISC 2017 and ASCE 7-10 earthquake codes were used to evaluate the building’s seismic performance before and after the reinforcement. The analysis’ findings suggest that the recommended technique is correct.

Аpplying of high-frequency monopolar diathermocoagulation in the treatment of chronic pulpitis

2020 ◽  
Vol 1 (12) ◽  
pp. 40-42
Author(s):  
F. Yu. Daurova ◽  
D. I. Tomaeva ◽  
S. V. Podkopaeva ◽  
Yu. A. Taptun
Keyword(s):  
Root Canal ◽  
High Frequency ◽  
Antibacterial Effect ◽  
Comparison Group ◽  
Poor Quality ◽  
Endodontic Treatment ◽  
Root Canals ◽  
The Third ◽  
Before And After

Relevance: the reason for the development of complications in endodontic treatment is poor-quality instrumental treatment root canals.Aims: a study of the animicrobial action and clinical efficacy of high-frequency monopolar diathermocoagulation in the treatment of chronic forms of pulpitis.Materials and methods: 102 patients with various chronic forms of pulpitis were divided into three groups of 34 patients each. In the first two groups, high-frequency monopolar diathermocoagulation was used in endodontic treatment in different modes. In the third group, endodontic treatment was carried out without the use of diathermocoagulation (comparison group). The root canal microflora in chronic pulpitis in vivo was studied twice-before and after diathermocoagulation.Results: it was established that high-frequency monopolar diathermocoagulation in the effect mode is 3, power is 4 (4.1 W) and effect is 4, power is 4 (5.4 W) with an exposure time of 3 seconds, it has a pronounced antibacterial effect on all presented pathogenic microflora obtained from the root canals of the teeth.

scholarly journals Numerical Modelling of Reinforced Concrete Slender Walls Subjected to Coupled Axial Tension–Flexure

2021 ◽  
Vol 15 (1) ◽  
Author(s):  
Xiaowei Cheng ◽  
Haoyou Zhang
Keyword(s):  
Reinforced Concrete ◽  
Plastic Hinge ◽  
Element Model ◽  
Lateral Loading ◽  
Design Parameters ◽  
Seismic Behaviour ◽  
High Rise ◽  
Ultimate Deformation ◽  
Axial Tension ◽  
Plastic Hinge Length

AbstractUnder strong earthquakes, reinforced concrete (RC) walls in high-rise buildings, particularly in wall piers that form part of a coupled or core wall system, may experience coupled axial tension–flexure loading. In this study, a detailed finite element model was developed in VecTor2 to provide an effective tool for the further investigation of the seismic behaviour of RC walls subjected to axial tension and cyclic lateral loading. The model was verified using experimental data from recent RC wall tests under axial tension and cyclic lateral loading, and results showed that the model can accurately capture the overall response of RC walls. Additional analyses were conducted using the developed model to investigate the effect of key design parameters on the peak strength, ultimate deformation capacity and plastic hinge length of RC walls under axial tension and cyclic lateral loading. On the basis of the analysis results, useful information were provided when designing or assessing the seismic behaviour of RC slender walls under coupled axial tension–flexure loading.

The Construction of the Later Poured Band and Quality Control

2014 ◽  
Vol 926-930 ◽  
pp. 661-664
Author(s):  
Min Chen
Keyword(s):  
Quality Control ◽  
Reinforced Concrete ◽  
Body Temperature ◽  
Construction Technique ◽  
High Rise ◽  
Concrete Body ◽  
Contraction Stress

Setting the late poured band is to solve different settlement between high-rise buildings and to settle the reinforced concrete body temperature--contraction stress. In addition, it effectively avoids the harmful cracks caused by the reinforced concrete body. So it is vital to set the late poured band and organize the correct construction. This paper aims at elaborating types of post pouring belt, construction preparation, construction technique, quality and so on.

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