scholarly journals Flexural Behavior of Artificially Degraded Steel I Section Externally Bonded With GFRP, BFRP&CFRP

2019 ◽  
Vol 8 (2) ◽  
pp. 2478-2484
Keyword(s):  
Weight Ratio ◽  
Steel Structure ◽  
Steel Structures ◽  
High Strength ◽  
Fiber Reinforced Polymer ◽  
Flexural Behavior ◽  
Reinforced Polymer ◽  
Externally Bonded ◽  
Structure Result ◽  
Strengthening Method

Due to the distinctive advantages such as high strength to weight ratio, high resistance to corrosion and chemical attacks, fiber reinforced polymer (FRP) sheets are widely used for strengthening and repairing of existing steel structures. In last two decades, study has been carried out over the use of FRP for strengthening and repairing of concrete structures. More recently, the use of FRP to strengthen existing steel structures has received much attention. Strengthening and retrofitting is necessary for steel structure after some time because durability and capacity of steel structure get reduced over the time .Conventional strengthening method such as welding of additional steel plate to existing structure result in increase in dead load , also it will undergo corrosion if strengthen structure is placed in corrosive environment. Use of FRP for strengthening and retrofitting of steel structure will be the excellent solution for these disadvantages. The main aim of this paper is to study the flexural behavior of artificially degraded steel I section externally bonded with GFRP, BFRP, and CFRP

Study of Box Girder Steel Structure Locally Reinforced by CFRP

2016 ◽  
Vol 860 ◽  
pp. 57-60 ◽  
Author(s):  
Zhi Ping Liu ◽  
Zong Chen Li ◽  
Ming Chang Li ◽  
Kai Chen ◽  
Chao Chao He
Keyword(s):  
Fatigue Cracks ◽  
Steel Structure ◽  
Steel Structures ◽  
Fiber Reinforced Polymer ◽  
Crack Model ◽  
Box Girder ◽  
Reinforced Polymer ◽  
Mechanics Characteristic ◽  
Set Up ◽  
Strengthening Method

On the basis of using CFRP (Carbon Fiber Reinforced Polymer) to reinforce steel materials and structures, this paper focused on the reinforcement method of box girder steel structure. Firstly, FEM models were set up to discuss the reinforce method, stress distribution between overall strengthening of flange and locally strengthening. Secondly, typical crack model was raised on the basis of mechanics characteristic, reinforcement effects under different methods was analyzed. The results showed that locally strengthening method to reinforce the certain fatigue areas could improve stress concentration phenomenon and SIF effectively. This paper offered a significant basement for reinforcing box girder steel structures and repairing fatigue cracks using CFRP.

scholarly journals Experimental Investigation of Fatigue Debonding Growth in FRP–Concrete Interface

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1459 ◽  
Author(s):  
Xinzhe Min ◽  
Jiwen Zhang ◽  
Chao Wang ◽  
Shoutan Song ◽  
Dong Yang
Keyword(s):  
Growth Rate ◽  
Weight Ratio ◽  
High Strength ◽  
Load Level ◽  
Experimental Results ◽  
Fatigue Load ◽  
Load Range ◽  
Pull Out ◽  
Reinforced Polymer ◽  
Externally Bonded

An externally bonded fiber reinforced polymer (FRP) plate (or sheet) is now widely used in strengthening bending members due to its outstanding properties, such as a high strength to weight ratio, easy operating, corrosion and fatigue resistance. However, the concrete member strengthened by this technology may have a problem with the adhesion between FRP and concrete. This kind of debonding failure can be broadly classified into two modes: (a) plate end debonding at or near the plate end, and (b) intermediate crack-induced debonding (intermediate crack-induced (IC) debonding) near the loading point. The IC debonding, unlike the plate end debonding, still needs a large amount of investigation work, especially for the interface under fatigue load. In this paper, ten single shear pull-out tests were carried out under a static or fatigue load. Different load ranges and load levels were considered, and the debonding growth process was carefully recorded. The experimental results indicate that the load range is one of the main parameters, which determines the debonding growth rate. Moreover, the load level can also play an important role when loaded with the same load range. Finally, a new prediction model of the fatigue debonding growth rate was proposed, and has an excellent agreement with the experimental results.

Confinement of Masonry Columns with Steel and Basalt FRCM Composites

2017 ◽  
Vol 747 ◽  
pp. 342-349 ◽  
Author(s):  
Mattia Santandrea ◽  
Giovanni Quartarone ◽  
Christian Carloni ◽  
Xiang Lin Gu
Keyword(s):  
Compressive Load ◽  
Basalt Fiber ◽  
High Strength ◽  
Fiber Reinforced Polymer ◽  
Vapor Permeability ◽  
Fiber Reinforced ◽  
Promising Alternative ◽  
Frp Composites ◽  
Reinforced Polymer ◽  
Externally Bonded

The rehabilitation of existing masonry elements by means of jacketing of columns using composite materials is becoming a remarkable technique in several applications that aim to increase the strength of existing masonry buildings. Fiber reinforced cementitious matrix (FRCM) composites are a newly developed strengthening system that consist of high-strength fibers embedded in a cementitious grout and externally bonded to the substrate. High resistance to fire and high temperatures, ease of handling during application, and vapor permeability with the substrate are some of the characteristics that make FRCMs a promising alternative to traditional organic composites such as fiber reinforced polymer (FRP) composites. This work presents the results of an experimental study carried out to understand the behavior of masonry columns with a square cross-section confined by steel and basalt fiber sheets embedded in a mortar matrix subjected to monotonic concentric compressive load. The effectiveness of the confinement is studied in terms of load-bearing capacity with respect to unconfined columns. The effect of corner radius for columns confined with basalt fibers is investigated.

scholarly journals rolyPOLY: A Hybrid Prototype For Digital Craft

2016 ◽  
Author(s):  
Andrew John Wit ◽  
◽  
Simon Kim ◽  
Keyword(s):  
Carbon Fiber ◽  
Weight Ratio ◽  
High Strength ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Simulation Tools ◽  
Robotic Fabrication ◽  
Reinforced Polymer ◽  
Traditional Construction ◽  
High Level

The recent introduction of carbon fiber reinforced polymer (CFRP) based simulation tools and robotic fabrication has opened potentials in not only design, but also in full-scale testing in architectural applications. CFRP’s unique properties such as high strength to weight ratio, malleability during fabrication as well as the capacity to create complex yet precise forms while minimizing waste through reconfigurable formworks allow for a high-level of precision and adaptability in architectural applications that traditional construction methodologies cannot afford.

scholarly journals Design and Analysis of Collapsible Scissor Bridge

2018 ◽  
Vol 152 ◽  
pp. 02013 ◽  
Author(s):  
Mohamad Nabil Aklif Biro ◽  
Noor Zafirah Abu Bakar
Keyword(s):  
Structural Strength ◽  
Weight Ratio ◽  
High Strength ◽  
Fiber Reinforced Polymer ◽  
Hydraulic Pump ◽  
Element Analysis ◽  
Remote Areas ◽  
Frp Composites ◽  
Reinforced Polymer ◽  
Flooded Area

Collapsible scissor bridge is a portable bridge that can be deployed during emergency state to access remote areas that are affected by disaster such as flood. The objective of this research is to design a collapsible scissor bridge which is able to be transported by a 4x4 vehicle and to be deployed to connect remote areas. The design is done by using Solidworks and numerical analysis for structural strength is conducted via ANSYS. The research starts with parameters setting and modelling. Finite element analysis is conducted to analyze the strength by determining the safety factor of the bridge. Kutzbach equation is also analyzed to ensure that the mechanism is able to meet the targeted degree of motion. There are five major components of the scissor structure; pin, deck, cross shaft and deck shaft. The structure is controlled by hydraulic pump driven by a motor for the motions. Material used in simulation is A36 structural steel due to limited library in ANSYS. However, the proposed material is Fiber Reinforced Polymer (FRP) composites as they have a high strength to weight ratio. FRP also tends to be corrosion resistance and this characteristic is useful in flooded area.

scholarly journals State-of-the Art and Practice of Concrete Structures Reinforced with FRP Bars

2012 ◽  
Vol 5 ◽  
pp. 195-200
Author(s):  
Lian Zhen Zhang ◽  
Wei Xiong
Keyword(s):  
State Of The Art ◽  
Concrete Structures ◽  
High Strength ◽  
Fiber Reinforced Polymer ◽  
Flexural Behavior ◽  
Light Weight ◽  
Bond Performance ◽  
The Past ◽  
Reinforced Polymer ◽  
Frp Bars

Fiber reinforced polymer (FRP) bars have been widely used in civil engineering used as a substitute for steel reinforcement because it has many advantage such as high strength, light weight and no corrosion. Moreover, the productive technology becomes more and more mature and industrialized so that FRP has become one economic and competitive structure material. Based on the recent researches, this paper mainly introduces progress in the studies on concrete structures reinforced with FRP bars. These contents in this paper include the bond performance of FRP bars in concrete, shear resistance, flexural behavior and ductility of concrete structure reinforced with FRP bars in the past few years in the world.

scholarly journals Study on Burr Formation and Tool Wear in Drilling CFRP and Its Hybrid Composites

2021 ◽  
Vol 11 (1) ◽  
pp. 384
Author(s):  
Jeong Hwan Lee ◽  
Jun Cong Ge ◽  
Jun Hee Song
Keyword(s):  
Tool Wear ◽  
Composite Laminates ◽  
Hybrid Composites ◽  
Weight Ratio ◽  
High Strength ◽  
Operating Conditions ◽  
Fiber Reinforced Polymer ◽  
Burr Formation ◽  
Fiber Reinforced ◽  
Reinforced Polymer

As contemporary emerging materials, fiber-reinforced plastics/polymers (FRP) are widely used in aerospace automotive industries and in other fields due to their high strength-to-weight ratio, high stiffness-to-weight ratio, high corrosion resistance, low thermal expansion and other properties. Drilling is the most frequently used process in industrial operation for polymer composite laminates, owing to the need for joining structures. However, it is a great challenge for operators to drill holes in FRP materials, due to the non-homogenous and anisotropic properties of fibers. Various damages, such as delamination, hole shrinkage, and burr and tool wear, occur due to the heterogeneous and anisotropic nature of composite laminates. Therefore, in this study, carbon fiber reinforced polymer (CFRP)/aramid fiber reinforced polymer (AFRP) hybrid composites (C-AFRP) were successfully synthesized, and their drilling characteristics, including burr generation and tool wear, were also mainly investigated. The drilling characteristics of CFRP and C-AFRP were compared and analyzed for the first time under the same operating conditions (cutting tool, spindle speed, feed rate). The experimental results demonstrated that C-AFRP had higher tensile strength and good drilling characteristics (low thrust and less tool wear) compared with CFRP. As a lightweight and high-strength structural material, C-AFRP hybrid composites have great potential applications in the automobile and aerospace industries after the slight processing of burrs generated during drilling.

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