scholarly journals Strengthening of concrete square column using FRP composites

2021 ◽  
Vol 2070 (1) ◽  
pp. 012206
Author(s):  
Aiswarya Manoj ◽  
Dhanya Sathyan
Keyword(s):  
Absorption Capacity ◽  
Concrete Column ◽  
Load Carrying Capacity ◽  
Energy Absorption Capacity ◽  
Banana Fiber ◽  
Synthetic Fibers ◽  
Frp Composites ◽  
Number Of Layers ◽  
Load Carrying ◽  
Loaded Column

Abstract Strength and energy absorption capacity are the important parameter for axially loaded column. This paper investigates the strength of unconfined square concrete column and externally confined square column with fiber-reinforced (FRP) composites with synthetic carbon fiber and natural banana fiber. This type of strengthening of column is widely accepted in practice. Axial strength test is performed on confined square column with different parameters such as number of layers of FRP materials, wrapping patters like full wrapping, center wrapping and hybrid pattern. Both natural and synthetic fibers are used for FRP-confined square concrete column. It was found that external confinement using FRP material improved the axial-load carrying capacity, load-deformation and ductility of the square column compared to the unconfined square column.

Investigation on the Behaviour of Fibre Reinforced Polymer Wrapped Concrete In-Filled Steel Tube Columns

2016 ◽  
Vol 857 ◽  
pp. 136-141
Author(s):  
P. Gajalakshmi ◽  
S. Aravind ◽  
P. Soundarapandian
Keyword(s):  
Finite Element ◽  
Carrying Capacity ◽  
Analytical Study ◽  
Steel Tube ◽  
Absorption Capacity ◽  
Load Carrying Capacity ◽  
Energy Absorption Capacity ◽  
Reinforced Polymer ◽  
Load Carrying ◽  
Fibre Reinforced Polymer

Concrete in-filled steel tube (CIFST) columns are mainly used as structural members in buildings located in seismic zones. CIFST columns prone to buckling and technique is required to control the buckling of concrete filled steel tubes when they are subjected to cycles of loading. In this work, CIFST columns wrapped with fibre reinforced polymer laminates (FRPL) to prevent the local buckling. Experimental and analytical study of CIFST columns externally wrapped with FRPL have been conducted. Theoretical study is also conducted to find the ultimate load carrying capacity of CIFST columns. The parameters involved in this investigation are type of fibre and shape of the steel tube. The CIFST columns are tested under lateral loading to determine the number of cycles to failure and energy absorption capacity and to observe the hysteresis behaviour. The analytical study comprises of finite element modeling of CIFST columns wrapped with FRPL. The results obtained from the experimental investigation and finite element model are compared. The results revealed that FRPL wrapped circular CIFST columns have higher load carrying capacity and energy absorption capacity and exhibit ductile behavior when compared to CIFST columns.

scholarly journals Performance of composite reinforced short column under axial loading

2018 ◽  
Vol 7 (3) ◽  
pp. 1376
Author(s):  
N Chaitanya ◽  
V Ranga Rao ◽  
M Achyutha Kumar Reddy
Keyword(s):  
Axial Loading ◽  
Element Model ◽  
Strain Gauges ◽  
Load Carrying Capacity ◽  
Short Column ◽  
Equal Angle ◽  
Short Columns ◽  
Load Carrying ◽  
Strain Stress ◽  
Loaded Column

The purpose of this paper is to compare the behaviour of composite reinforced concrete square short columns and conventional square short column. Experiments are conducted on four axially loaded column specimens till failure. Among four specimens, two are conventional and remaining two columns are having equal angles as main reinforcement. Short columns are designed using IS 456 2000. The obtained details of main reinforcement are replaced in area wise by equal angle (ISA 2525). The tie reinforcement used to withhold the main reinforcement in position are retained with the same deformed bars. Performance of columns are measured in terms of load carrying capacity, longitudinal strain, stress, crushing modes, strains in each face using strain gauges. Outcome of the experiments are compared and plotted in the form of stress vs strain of the column. A finite element model was developed using Abaqus to simulate the results.  

scholarly journals Performance of Sprayed Fiber Reinforced Polymer Strengthened Timber Beams

2010 ◽  
Vol 2010 ◽  
pp. 1-6 ◽  
Author(s):  
S. Talukdar ◽  
N. Banthia
Keyword(s):  
Energy Absorption ◽  
Carrying Capacity ◽  
Absorption Capacity ◽  
Fiber Reinforced Polymer ◽  
Load Carrying Capacity ◽  
Fiber Reinforced ◽  
Bonding Agents ◽  
Reinforced Polymer ◽  
Load Carrying ◽  
Timber Beams

A study was carried out to investigate the use of Sprayed Fiber Reinforced Polymer (SFRP) for retrofit of timber beams. A total of 10-full scale specimens were tested. Two different timber preservatives and two different bonding agents were investigated. Strengthening was characterized using load deflection diagrams. Results indicate that it is possible to enhance load-carrying capacity and energy absorption characteristics using the technique of SFRP. Of the two types of preservatives investigated, the technique appears to be more effective for the case of creosote-treated specimens, where up to a 51% improvement in load-carrying capacity and a 460% increase in the energy absorption capacity were noted. Effectiveness of the bonding agent used was dependent on the type of preservative the specimen had been treated with.

Key Performance Indicators of Tubes Used as Energy Absorbers

2014 ◽  
Vol 626 ◽  
pp. 155-161 ◽  
Author(s):  
T.X. Yu ◽  
Yan Fei Xiang ◽  
Min Wang ◽  
Li Ming Yang
Keyword(s):  
Energy Absorption ◽  
Carrying Capacity ◽  
Performance Indicators ◽  
Key Performance Indicators ◽  
Absorption Capacity ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
Engineering Designs ◽  
Energy Absorbers ◽  
Energy Absorbing

Based on our extensive studies on the experimental, theoretical and numerical results on various tubes under axial compression/impact in the last few years, we propose a set of Key Performance Indicators (KPIs) to assess and compare the energy absorbing performance of tubular structures with various configurations, so as to guide the design of energy absorbers whilst to archive a certain degree of optimization. The KPIs have five factors: Effective stroke ratio (ESR), Non-dimensional Load-carrying capacity (NLC), Effectiveness of energy absorption (EEA), Specific energy absorption capacity (SEA), Stableness of load-carrying capacity (SLC).The paper presents a series of diagrams to compare the energy absorbing performance of various tubes in terms of the four KPIs as described above. The work is valuable to engineering designs and applications, as well as to the further studies of the topic.

Load Carrying Capacity Analysis of Multi-Spiral Reinforced Concrete Column

2010 ◽  
Vol 150-151 ◽  
pp. 441-446
Author(s):  
Jing Wu ◽  
Fa Zhou Wang ◽  
Wen Yang ◽  
Qing Jun Ding
Keyword(s):  
Carrying Capacity ◽  
Rectangular Cross Section ◽  
Concrete Columns ◽  
Confined Concrete ◽  
Transverse Reinforcement ◽  
Concrete Column ◽  
Load Carrying Capacity ◽  
Reinforced Concrete Column ◽  
Load Carrying ◽  
Column Design

The behavior of confined concrete is highly dependent on the confinement type of transverse reinforcement, spiral hoops are generally believed to have better confined effect in concrete than rectangular hoops. It is verified through experiments and the oretical calculations that multi-spiral confined concrete columns have better mechanical properties than single spiral columns, the multi-spiral significantly increase the column’s strength, plasticity, ductility and anti-seismic capability. Based on the three-direction stress law of confined concrete, the load carrying capacity of the rectangular cross section concrete column with multi-spiral is analysed in this paper, and the calculated equation of the load carrying capacity is proposed, which provide a theory and calculation basis for multi-spiral confined concrete column design and research.

scholarly journals Effect of different fiber type on sprayed concrete support capacity

2020 ◽  
Vol 3 (1) ◽  
pp. 1-6
Author(s):  
J. M. Alavarado ◽  
A. Duarte
Keyword(s):  
Energy Absorption ◽  
Steel Fiber ◽  
Fiber Type ◽  
Absorption Capacity ◽  
Steel Fibers ◽  
The Other ◽  
Energy Absorption Capacity ◽  
Load Bearing Capacity ◽  
Sprayed Concrete ◽  
Synthetic Fibers

Nowadays there are several types of fiber for the reinforcement of the sprayed concrete used in tunnel support; most popular among them are steel fibers and macro synthetic fibers. However, in most cases the assessment of fiber reinforced sprayed concrete ductility is focused on the fulfillment of energy absorption capacity requirements without considering the effect of the reinforcement type on the Load-Displacement behavior. The following study aims to find out if the support capacity provided by each fiber type is the same for similar levels of energy absorption capacity or how it can be affected through the analysis of the load bearing capacity. After the analysis of energy absorption tests according to EFNARC of more than 50 specimens separately reinforced with steel and macro synthetic fibers, it was observed the specimens reinforced with steel fiber absorbed more energy since the beginning of deformation than those reinforced with macro synthetic fibers. In other words, the required work to start deforming the steel fiber reinforced sprayed concrete is greater than the required with the other fiber type. Likewise, the ultimate strength or maximum load bearing capacity provided by steel fibers was higher than the other fiber type. Therefore, the support capacity of the sprayed concrete and the related safety factor provided by each fiber type is different

Effect of Strain Rate on the Bending Properties of Human Ribs

2011 ◽  
Author(s):  
Gavriel Feuer ◽  
Subrata Saha
Keyword(s):  
Strain Rate ◽  
Deformation Rate ◽  
Bending Moment ◽  
Absorption Capacity ◽  
Energy Absorption Capacity ◽  
Maximum Deformation ◽  
Three Point Bending ◽  
Ultimate Deformation ◽  
Bending Mode ◽  
Load Carrying

To fully characterize the mechanical behavior of bones under various loading conditions, it is important to determine the effect of strain rate on the load carrying capacit and fracture behavior of various members of our skeletal system. In this study embalmed human ribs were tested in a three-point bending mode under deformation rates of 0.05 mm/s, 0.5 mm/s, and 8 mm/s. Mechanical parameters such as maximum bending moment, maximum deformation, bending stiffness, and energy absorption capacity were determined. The maximum bending moment and stiffness showed an increase by 53 and 8 percent, respectively, at the highest rate of deformation compared to the lowest. The ultimate deformation and energy absorbed also increased by 26 and 66 per cent, respectively, in this range of deformation rate. This data confirms that bone is visco-elastic in nature and exhibits different mechanical properties that depend on the deformation rate.

Testing on Energy Absorption of Banana Fiber Polyester Composite

2011 ◽  
Vol 117-119 ◽  
pp. 873-875
Author(s):  
Noor Hisyam Bin Noor Mohamed ◽  
Hasmiryadie Juneh ◽  
Mahshuri Yusof
Keyword(s):  
Energy Absorption ◽  
Specific Energy ◽  
Fiber Length ◽  
Absorption Capacity ◽  
Synthetic Fiber ◽  
Energy Absorption Capacity ◽  
Banana Fiber ◽  
Specific Energy Absorption ◽  
Banana Fibers ◽  
Polyester Composite

Natural fibers are now becoming a subject of interest to replace synthetic fiber as reinforcement materials where the development of natural fiber composites has been conducted in the last few decades. The objective of this research is to investigate the energy absorption capacity of banana fiber polyester composite and its specific energy absorption capacity as well. Banana fibers are extracted and cut into 10mm, 20mm and 30mm fiber length. Fabrication of rectangular bar as composite samples with different banana fiber length and fiber volume fraction (1%, 2%, and 3%) were conducted and the results are studied and analyzed. The information on energy absorption and specific energy absorption capacity are useful for applications such as automotive structures where the ability to absorb impact may save life. The increase of banana fiber content and length shows an increase of maximum load and energy absorption values for all specimens.

scholarly journals Flexural Performance of Cross-Laminated Bamboo (CLB) Slabs and CFRP Grid Composite CLB Slabs

2019 ◽  
Vol 2019 ◽  
pp. 1-17 ◽  
Author(s):  
Qingfang Lv ◽  
Weiyang Wang ◽  
Ye Liu
Keyword(s):  
Carrying Capacity ◽  
Failure Modes ◽  
Strain Analysis ◽  
Manufacturing Processes ◽  
Load Carrying Capacity ◽  
Layer Number ◽  
Flexural Performance ◽  
Number Of Layers ◽  
Laminated Bamboo ◽  
Load Carrying

In order to accord well with the requirements of sustainable development and green construction, a cross-laminated bamboo composed of an odd number of orthogonally oriented layers of bamboo scrimber is proposed in this paper. Adjacent bamboo layers are face-bonded by structural adhesives under pressure. The uniform mechanical and physical properties can be obtained through the orthogonal layup. Flexural performances of three groups of one-way CLB slabs and two groups of one-way CLB slabs strengthened with CFRP grids were investigated via four-point monotonic loading configuration until failure. Experimental parameters of thickness of the layer, number of layers, and manufacturing processes of CFRP grids were taken into consideration. Experimental observations showed that the failure of the CLB slab was brittle, and different failure modes were found in the CLB slab with CFRP grids via different manufacturing processes. Test results showed that the load-carrying capacity increased with the thickness of the layer, number of layers, and application of CFRP grids pressed in the bamboo layer, but the CFRP grids pressed in the interface of adjacent bamboo layers weakened the load-carrying capacity. The strain analysis demonstrated that the compression region was utilized with more efficiency via CFRP grids pressed in the bamboo layer, and the plane cross section assumption is suitable for both CLB slab and CLB slab strengthened with CFRP grids. A theoretical calculation method of flexural load-carrying capacity was proposed for the CLB slab, the accuracy of which was proved.

Reinforcement of Damaged Concrete Columns by Filament Winding of Thermoplastic Composites

2002 ◽  
Vol 10 (4) ◽  
pp. 273-280
Author(s):  
K. Friedrich ◽  
N. Glienke ◽  
J. Flöck ◽  
F. Haupert ◽  
S. A. Paipetis
Keyword(s):  
Reinforced Concrete ◽  
Carrying Capacity ◽  
Concrete Columns ◽  
Reinforce Concrete ◽  
Filament Winding ◽  
Thermoplastic Composites ◽  
Concrete Column ◽  
Load Carrying Capacity ◽  
Composite Systems ◽  
Load Carrying

An experimental study was conducted to compare various composite systems with different fibres (E-glass and carbon) in two different thermoplastic matrices (PPS, PEEK) for their strengthening efficiency for wrapped concrete columns. The results indicated that the use of E-glass fibres within a polyphenylenesulfide matrix to externally reinforce concrete columns is quite effective. The carbon fibre PEEK based system does not show much improvement in the load carrying capacity. The thickness of wrap/radius of concrete column-ratio also has an influence on the strengthening efficiency. For example ten layers of glass fibre/PPS-tapes resulted in a five fold improvement of the compressive strength of the non-reinforced concrete. Predamaged samples with the same amount of reinforcement were still 4.5 times stronger than the undamaged, non-reinforced concrete.

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