scholarly journals Research of technical and economic indicators of reinforcement of reinforced concrete beams by different technologies

2020 ◽  
pp. 144-153
Author(s):  
О. Molodid ◽  
I. Maksymiuk ◽  
A. Hryhorova
Keyword(s):  
Carbon Fiber ◽  
Bearing Capacity ◽  
Fiber Reinforcement ◽  
Economic Indicators ◽  
Design Solution ◽  
Labor Intensity ◽  
Rigid Support ◽  
Carbon Fiber Reinforcement ◽  
External Reinforcement ◽  
Technical And Economic Indicators

The article presents the results of experimental investigations to determine the destructive force of beams reinforced with external reinforcement and control (without reinforcement). According to the results of such investigations, it can be stated that the strengthening of beam structures by external reinforcement made it possible to increase their bearing capacity by 383.3%. It has been established that both carbon fiber reinforcement using "clamps" and carbon fiber reinforcement are effective.The performed analytical researches established technical and economic indicators of various methods of reinforcement of beam constructions, namely: the addition of additional supports, the addition of additional beams, the external reinforcement of stretched zones by MAPEI technology. As a result, data were obtained indicating that the reinforcement of the crossbar by bringing additional rigid support requires 110.4 man-hours (100%), the reinforcement of the crossbar by bringing additional beams - 94.4 man-hours (85.5%), the reinforcement of the crossbar by external reinforcement - 48 man-hours (43.5%). In this case, the reinforcement of the crossbar by bringing additional rigid support is performed in 9.7 days (100%), the reinforcement of the crossbar by bringing additional beams - 6 days (62%), the reinforcement of the crossbar by external reinforcement - 4 days (41.4%). It is also established that the reinforcement of the crossbar by bringing additional rigid support costs 51.8 thousand UAH (100%), strengthening the structure by bringing additional beams - 58.1 thousand UAH (112%), strengthening the structure by external reinforcement - 35.72 thousand UAH (68.9%).The obtained research results indicate that the labor intensity, duration and cost of reinforcing the beam with external reinforcement is lower compared to other technologies. Efficiency is achieved by a structural component - increasing the bearing capacity without changing the design solution and by technological component - reducing the labor intensity, duration and cost of work.

The Principle and Calculation Method of Carbon Fiber Reinforcement for Tunnels and Underground Structures

2011 ◽  
Vol 94-96 ◽  
pp. 1247-1251
Author(s):  
Hong Ke Pan ◽  
Jiang Chun Hu ◽  
Lin De Yang
Keyword(s):  
Carbon Fiber ◽  
Bearing Capacity ◽  
Calculation Method ◽  
Underground Structure ◽  
Fiber Reinforcement ◽  
Bending Moment ◽  
Design Calculation ◽  
Underground Engineering ◽  
Single Section ◽  
Carbon Fiber Reinforcement

There will emerge cracks or damage due to the action of rock pressure or its own shortcomings and low strength for the lining structure in tunnel or underground engineering, especially at the places of excessive bending moment and tensile stress because of bias pressure where concrete will be pull apart for the deficiency of strength even to cause leakage and durability insufficient. Conventional maintenance and reinforce methods are time-consuming and laborious, and the effect is also not ideal. It is simple, timesaving and having a significant and lasting effect to use carbon fiber reinforcement method. This paper studied structure’s failure mechanism and on the basis of that the principle of fiber-plate reinforcement from the angle of structural plastic development, then studied the improvement of structure’s mechanical character and the change of design calculation method for single section of underground structure with carbon fiber plates by using the research method of plane-strain. At the same time, the typical model of integral failure for single section was analyzed and the calculation method and formulae of bearing capacity and reinforcing steel bars were deduced, which remedied the shortfall in the design specification for concrete structure. In the end, by comparing the calculation results of structure with fiber plates and that with not fiber plates based on engineering example, the conclusion that structure’s bearing capacity and capability of resistance to deformation had obvious improvement was obtained.

Structural Behavior of Reinforced Concrete Beams Strengthened with Carbon Fiber Reinforcement Polymer Plate

2013 ◽  
Vol 302 ◽  
pp. 338-342
Author(s):  
Soo Yeon Seo
Keyword(s):  
Carbon Fiber ◽  
Fiber Reinforcement ◽  
Reinforced Concrete Beams ◽  
Structural Behavior ◽  
Rc Beam ◽  
Near Surface ◽  
Cfrp Plate ◽  
Carbon Fiber Reinforcement ◽  
Externally Bonded ◽  
Near Surface Mounted

This paper presents the study to find retrofit effect in case of Near-Surface-Mounted Retrofit (NSMR) using Carbon Fiber Reinforcement Polymer (CFRP) plate targeting reinforcement concrete (RC) beam by comparing the previous Externally Bonded Retrofit (EBR) method through experimental analytical works. Three RC beam specimens were made and two of them were retrofitted with CFRP plate by using EBR and NSMR. Also Finite Element (FE) analysis was performed in order to simulate the structural behavior of the beams by considering the bond properties between concrete and CFRP. From the study, it was found that the beam retrofitted with EBR hada reduction of bond capacity in the joint while the beam retrofitted with NSMR had perfect bond capacity.

Two-component adhesive based on aqueous emulsion of ED-20 resin for carbon-fiber reinforcement of bearing concrete structures

2013 ◽  
Vol 86 (7) ◽  
pp. 1099-1107
Author(s):  
E. V. Shinkareva ◽  
P. I. Statkevich ◽  
V. D. Koshevar ◽  
N. L. Budeiko ◽  
S. N. Leonovich
Keyword(s):  
Carbon Fiber ◽  
Concrete Structures ◽  
Fiber Reinforcement ◽  
Aqueous Emulsion ◽  
Carbon Fiber Reinforcement ◽  
Two Component

Carbon Fiber Reinforced Shape Memory Nanocomposites Incorporated With Highly Conductive Carbon Nanopaper for Electro Actuation

2013 ◽  
Author(s):  
Fei Liang ◽  
Jihua Gou ◽  
He Shen ◽  
Yunjun Xu ◽  
Bob Mabbott
Keyword(s):  
Carbon Fiber ◽  
Shape Memory ◽  
Smart Materials ◽  
Shape Memory Polymer ◽  
Flexural Modulus ◽  
Fiber Reinforcement ◽  
High Strength ◽  
Mechanical Analysis ◽  
Carbon Fiber Reinforcement ◽  
Continuous Carbon Fiber

Shape memory polymers (SMPs) are one of the most popular smart materials due to light weight and high elastic deformation capability. In this study, highly conductive carbon nanofibers paper (CNFP) was coated on the surface of SMP as a conductive layer for electro actuation of SMP. To overcome the drawback of low modulus and low strength of shape memory polymer (SMP), continuous carbon fiber reinforcement was also incorporated with SMP by autoclave processing. The dynamic mechanical analysis (DMA) result showed over 600% increase of storage modulus of SMP by introducing carbon fiber reinforcement. Also, the shape recovery time of SMP has been reduced over 150%, while the recovery ratio of SMP has been improved to 99% by incorporating with carbon fiber reinforcement. Additionally, the mechanical property degradation of SMP composites has been investigated after different electro actuation cycles. After 50 actuation cycles, the decrease of flexural modulus of SMP composites is negligible (< 2%), and the ultimate flexural strength of SMP composites only decreased 25%. The SMP composite shows high strength and modulus, and good durability.

Additively Manufactured Roof Frame Segment with Local Carbon Fiber Reinforcement

2019 ◽  
Vol 12 (4) ◽  
pp. 52-55
Author(s):  
Wojciech Brymerski ◽  
Jan-Philipp Fuhr ◽  
Farbod Nezami
Keyword(s):  
Carbon Fiber ◽  
Fiber Reinforcement ◽  
Carbon Fiber Reinforcement

Shear Behavior Of Anchors On The Basis Of Carbon Fiber At External Reinforcement

2019 ◽  
pp. 59-64
Keyword(s):  
Carbon Fiber ◽  
Bearing Capacity ◽  
Carbon Fibers ◽  
Experimental Studies ◽  
Shear Forces ◽  
External Reinforcement ◽  
Concrete Body ◽  
Improve Calculation ◽  
Analysis Of Results ◽  
The Impact

In systems of external reinforcement on the basis of carbon fibers used for strengthening concrete structures, special attention should be paid to the anchoring of carbon reinforcement elements. Taking into account their installation in the external reinforcement system in the reinforced structure, the anchoring elements can work on the shear. At the same time, the nature of such operatioj as a whole is insufficiently studied, which raises many questions both about their calculation and their design. In order to improve calculation and design methods of carbon anchors, special experimental studies of the parameters of anchors and their impact on the bearing capacity of the anchor fastening were carried out. These studies relate to the length of the anchorage in the concrete body, maximum shear forces, ultimate deformations of the anchor etc. According to the results of the experiments conducted, the analysis of results obtained was performed, in particular, various schemes of destruction of anchors were analyzed and the impact of the depth of the anchor, its diameter of the anchor, as well as the type of binder on the degree of theirdestruction were studied.

411 Carbon Fiber Reinforcement for Resin Products by 3D Printer

2015 ◽  
Vol 2015.51 (0) ◽  
pp. _411-1_-_411-2_
Author(s):  
Yuki OIKAWA ◽  
Yuma MIKUNI ◽  
Yuma ENDO ◽  
Tetsuya OIZUMI ◽  
Takatoshi SUENAGA
Keyword(s):  
Carbon Fiber ◽  
Fiber Reinforcement ◽  
3D Printer ◽  
Carbon Fiber Reinforcement
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