Experimental and numerical study of CFRP reinforced steel beams

2020 ◽  
pp. 147509022096026
Author(s):  
Minos E Kypriadis ◽  
Elias P Bilalis ◽  
Nicholas G Tsouvalis
Keyword(s):  
Large Scale ◽  
Numerical Study ◽  
Load Capacity ◽  
Steel Structures ◽  
High Strength ◽  
Maximum Load ◽  
Steel Beams ◽  
High Fatigue ◽  
Reinforced Steel ◽  
Large Scale Tests

The use of composite materials patches for the reinforcement of steel structures attracts particular interest. Due to their high strength, light weight, and high fatigue and corrosion resistance, composite patches represent a versatile reinforcement solution. In this paper, the reinforcement of steel beams with CFRP patches is examined. Large scale tests of “H” and “square hollow” cross section steel beams are conducted. The beams are reinforced with CFRP patches, investigating the effect of the thickness and the length of the patch, and the type of the cohesive joint. All reinforced specimens showed increase of their stiffness and their maximum load capacity. Furthermore, advanced finite element models are developed for the simulation of the mechanical behavior of the reinforced steel beams. FE results relate very well to the experimental ones for most of the measured magnitudes, thus verifying the reliability of the developed models in estimating stiffness, yield load and maximum load capacity of the beams.

Deformation Measurements on Full-Scale Fracture Tests of Pre-Cracked Tubular Joints

2003 ◽  
Author(s):  
Bijan Talei-Faz ◽  
Feargal P. Brennan ◽  
Stuart Robson
Keyword(s):  
Large Scale ◽  
Fatigue Testing ◽  
Three Dimensional ◽  
Steel Structures ◽  
High Strength ◽  
Static Strength ◽  
Full Scale ◽  
Structural Testing ◽  
Tubular Joints ◽  
Large Steel

A series of six static strength destructive tests were performed on full-scale pre-cracked tubular welded T-joints manufactured from a high strength weldable steel used in the construction of offshore Jack-Up platforms. All specimens had at least one through-thickness fatigue crack at the weld toe, from a previous fatigue-testing programme. The tests were aimed at analysing the residual static strength of the cracked members. As destructive tests are costly to perform, every effort was made to maximise the data collected. This included the use of a novel photogrammetric technique to provide three-dimensional measurement in real time of the deformation in the vicinity of the brace-chord intersection. The technique has been used for large-scale structural testing in a number of civil and aerospace applications, but to the author’s knowledge this is the first time that it has been employed for the full-scale mechanical testing of large steel structures. This paper describes the details of the photogrammetric technique applied to the large steel specimens which were loaded to failure, resulting in the total separation of the intersecting members. It is hoped that the technique can be used to generate information which can be used in conjunction with finite element or other numerical analyses to increase the accuracy and reliability of modelling cracked tubular joints.

Seismic Tests of Welded Moment Resisting Connections Made of Laser-Welded Stainless Steel Sections

2018 ◽  
Vol 763 ◽  
pp. 440-449
Author(s):  
Hafez Taheri ◽  
George Charles Clifton ◽  
Ping Sha Dong ◽  
Michail Karpenko ◽  
Gary M. Raftery ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Carbon Steel ◽  
Large Scale ◽  
Steel Structures ◽  
Steel Beams ◽  
Steel Connections ◽  
Steel Members ◽  
Moment Resisting ◽  
Steel Sections ◽  
Seismic Tests

Steel structures are well established as the preferred material for constructing seismic resisting systems in New Zealand and around the world. While the majority of steel framing is made of carbon steel, stainless steel is increasingly being considered for designing exposed steel structures. Because of significant differences in the mechanical properties between the two materials, seismic resisting system design rules for connections between carbon steel members may not be applicable, at least without modification, to connections between stainless steel members. This study has investigated the seismic performance of welded T-shaped beam-column moment resisting connections made of structural stainless steel beams and columns manufactured by laser welding. The paper included the results of three large-scale T-shaped specimens, of varying sizes, subjected to seismic loads. The grade of laser-fused stainless steel was 304 L and its specification was according to ASTM A276. The sections were subject to the seismic tests in accordance with the SAC protocol given in ANSI/AISC 341-10. The results shows substantial amount of energy dissipation by welded moment resisting stainless steel connections along with a high ductility capability and dependable behaviour in the inelastic range.

scholarly journals Investigation and numerical analysis of steel beams strengthened with CFRP

2021 ◽  
Vol 37 (3) ◽  
Author(s):  
M. Khanloo ◽  
H. Dashti-Naserabadi ◽  
M. Jamshidi
Keyword(s):  
Concrete Structures ◽  
Steel Structures ◽  
High Strength ◽  
Steel Beams ◽  
Steel Beam ◽  
Reinforced Concrete Structures ◽  
Ansys Software ◽  
Variable Parameters ◽  
Design Engineers ◽  
Composite Layers

One of the most common methods of strengthening concrete structures is the use of composite fibers such as FRP. These fibers have found a special place in structural retrofitting methods due to a number of specific ability including lightness and ease of performance. Reinforced concrete structures have long been considered by design engineers for the possibility of retrofitting high strength composite steel structures. In this study, twenty-two steel beam models were modeled by ANSYS software. Variable parameters studied in the modeled steel beams can be referred to the number, orientation and thickness of composite layers.

The Numerical Study on Load-Transferring Model for SFRC Double-Column Combined Six-Pile Caps

2008 ◽  
Vol 400-402 ◽  
pp. 321-327
Author(s):  
Yuan Yuan Zhang ◽  
Li Hua Xu ◽  
Yin Chi
Keyword(s):  
Large Scale ◽  
Steel Fiber ◽  
Numerical Study ◽  
Limit Load ◽  
Fiber Reinforced Concrete ◽  
Steel Fiber Reinforced Concrete ◽  
Finite Element Software ◽  
Pile Caps ◽  
Reinforced Steel ◽  
Distribution Of Stress

For discussing the mechanism of load-transferring for reinforced steel fiber reinforced concrete (SFRC) double-column combined six-pile caps, the large-scale general finite element software-ABAQUS is used for the tested SFRC caps with computing in the aspects of modeling, cracking load, limit load, load-deformation curve, distribution of stress in caps and cracks and etc. The results of computing is compared with the result of experiments and the comparison is indicated: The results of computing and experiments are coincided well; The destroy pattern of SFRC double-column combined six-pile caps is sheared damage or punched damage and the model of load-transferring accords with spatial strut-and-tie method (STM); The mixture of steel fiber can improve cracking load and limit load for RC caps, delay the crack for caps, block the cracks’ expansion, and enhance the cap’s ductility.

Application of Finite Strip Method in Vehicle Design: Part 2 of 2—Post Buckling Analysis of Thin Walled Structures

2011 ◽  
Author(s):  
Umesh Gandhi ◽  
Stephane Roussel ◽  
K. Furusu ◽  
T. Nakagawa
Keyword(s):  
Load Capacity ◽  
High Strength ◽  
Maximum Load ◽  
Element Formulation ◽  
Tangent Stiffness Matrix ◽  
Finite Strip ◽  
Thin Walled Structures ◽  
Non Linear ◽  
Post Buckling ◽  
Thin Walled

Thin walled parts of high strength steel, under compressive loads are likely to buckle locally, and then depending on geometry and material properties the section may continue to carry additional load. For the post buckling conditions the deformations are large but finite. Therefore we need to consider geometrical non linearity in the calculations. In this paper we are extending the linear finite strip element formulation to include geometrical non linearity. Method to derive secant and tangent stiffness matrix for non linear finite strip element is developed and then the element formulation is verified for inplane and center load on a plate using Newton Raphson solver. The new non linear finite strip element can be useful in estimating maximum load capacity (including post buckling) of thin walled structures from 2D data.

scholarly journals Behaviour of Shear Connector in CFST for Axial Strength

2021 ◽  
Vol 9 (VI) ◽  
pp. 3349-3366
Keyword(s):  
Numerical Study ◽  
Cost Savings ◽  
Axial Loading ◽  
Steel Structures ◽  
High Strength ◽  
Structural Diversity ◽  
Steel Tube ◽  
Component Part ◽  
Concrete Filled Steel Tube ◽  
The Impact

Concrete Filled Steel structures (CFST) offers wide benefits like high strength, ductility, and energy absorption with the combined benefits of steels and concrete. It also reduces the complexity of the production, as it does not require the shuttering of work, and so it is not commonly used. In addition to CFST elements, are more efficient, and allow for rapid construction and cost savings due to the elimination of the shape and material of component part. Concrete-filled-steel-tube is currently gaining more and more popularity in the construction industry. Concrete-filled-steel-tube it is a component of a good performance, as a result of the impact of the steel and holds it with concrete, and the question of structural diversity. In this paper, it presents a study of the evolution of the load carrying capacity, used for the connection of a variety of sizes and shapes, with a different position. The composite action of steel and concrete there is a need for a strong bond between the steel and concrete interface. Analysis of CFST column using the Finite element method and the numerical study is done on the selected case under axial loading condition.

scholarly journals NUMERICAL STUDY OF WAVE RUN-UP AT PERMEABLE FIXED REVETMENT SLOPE

2017 ◽  
pp. 32
Author(s):  
Izmail Kantarzhi ◽  
Sergii Kivva ◽  
Natalia V Shunko
Keyword(s):  
Porous Medium ◽  
Numerical Model ◽  
Large Scale ◽  
Numerical Study ◽  
Water Filtration ◽  
Wave Surface ◽  
Natural Conditions ◽  
Wave Flume ◽  
Run Up ◽  
Large Scale Tests

The numerical model of wave surface elevation and water filtration in the saturated-unsaturated porous medium is developed. The model uses to define the parameters of the wave run-up at the slope protected by the permeable fixed layer. The model shows the wave surface in the different times, including the wave run-up height at the slope and wave run-down. Also, the velocities in the upper protected layer as well in the soil body of the slope are defined. Model is verified with using of the published large-scale tests with the slopes protected by Elastocoast technology layers. The tests were carried out in the wave flume of Technical University Braunschweig. The numerical model may be applied to calculate the maximal waves run-up at the protected engineering and beach slopes in natural conditions.

scholarly journals A Numerical Investigation on the Structural Behavior of Deficient Steel Frames Strengthened using CFRP Composite

2018 ◽  
Vol 20 (1) ◽  
pp. 1 ◽  
Author(s):  
Amir Hamzah Keykha
Keyword(s):  
Numerical Study ◽  
Load Capacity ◽  
Steel Frames ◽  
Steel Structures ◽  
Independent Study ◽  
Fiber Reinforced Polymers ◽  
Structural Behavior ◽  
Ultimate Load Capacity ◽  
Hollow Section ◽  
Cfrp Composite

Carbon fiber reinforced polymers (CFRP) is one of the materials that is used to strengthen steel structures. Most studies on CFRP strengthening steel on structures have been done on beams and steel columns. No independent study has studied the effect of CFRP strengthening on the structural behavior of steel frames having initial deficiency.The deficiency in steel structures may be created due to the errors caused by construction and others.This study aims to carry out a numerical study on the efficiency of CFRP sheet on strengthening square hollow section (SHS) steel frames having initial deficiency. Seven specimens, five of which were strengthened using CFRP sheets, were analyzed. ANSYS software was used to analyze the SHS steel frames. The results showed that the coverage length, the width, and the number of CFRP layers have a significant effect on increasing and recovering the ultimate load capacity of the SHS steel frames having initial deficiency.

Structural Integrity Assessment of Doel 3 and Tihange 2 RPVs Linear Elastic and Elastic-Plastic X-FEM Calculations Performed for Large Scale Tests

2016 ◽  
Author(s):  
Valéry Lacroix ◽  
Pierre Dulieu
Keyword(s):  
Large Scale ◽  
Structural Integrity ◽  
Load Capacity ◽  
Pressure Vessels ◽  
Integrity Assessment ◽  
Elastic Plastic ◽  
Linear Elastic ◽  
Nuclear Control ◽  
Large Scale Tests ◽  
Reactor Pressure

In the framework of the hydrogen flakes issue concerning the reactor pressure vessels of the two Belgian NPP’s Doel 3 and Tihange 2, the Federal Agency of Nuclear Control required to perform tests on large scale specimens taken from a block representative of the pressure vessels with the double objective of validating the structural integrity approach and of verifying the load capacity of the specimens affected by flakes. The large scale tests were led on many kinds of specimens: 4 points bending specimens, CT specimens and tensile specimens containing hydrogen flakes or flawed with EDM notches. All of these tests have been simulated using extend finite element method (XFEM). The paper describes the linear elastic and elastic-plastic fracture mechanics calculations performed in the frame of these large scale tests using XFEM and presents the comparison between simulations and experiments. A focus is done on the XFEM capabilities to model 3D complex shaped flaws like hydrogen flakes.

scholarly journals High-Strength Concrete Circular Columns with TRC-TSR Dual Internal Confinement

Buildings ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 218
Author(s):  
Rami Eid ◽  
Avi Cohen ◽  
Reuven Guma ◽  
Eliav Ifrach ◽  
Netanel Levi ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
High Strength Concrete ◽  
Large Scale ◽  
Load Capacity ◽  
High Strength ◽  
Construction Method ◽  
Textile Reinforced Concrete ◽  
Rc Columns ◽  
Strength Concrete ◽  
Ductile Behavior

The standard requirements for transverse steel reinforcement (TSR) confinement in reinforced-concrete (RC) columns are mainly to provide the following: ductile behavior, minimum axial load capacity of the column’s core, and prevention of longitudinal bars buckling. It is well-known that the passive confinement due the TSR action is less effective in high-strength concrete (HSC) compared to normal-strength concrete (NSC). Therefore, the TSR amounts required by the standards for HSC columns are high, and in some cases, especially in the lower stories columns of high-rise buildings, are impractical. This paper presents a new construction method using textile-reinforced concrete (TRC) as internal confinement together with reduced TSR amounts. Moreover, comparison of the proposed method with RC columns casted in fiber-reinforced polymer (FRP) stay-in-place forms as additional external confinement, is presented. Eleven large-scale column specimens were tested under axial compression. The results give an insight on the application feasibility of the proposed construction method. It is shown that the TRC-TSR dual internal confinement action can be an option to reduce the standard required TSR amounts while maintaining similar levels of ductile behavior.

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