scholarly journals Flexural bearing capacity and failure mechanism of CFRP-aluminum laminate beam with double-channel cross-section

2021 ◽  
Vol 28 (1) ◽  
pp. 139-152
Author(s):  
Teng Huang ◽  
Dongdong Zhang ◽  
Yaxin Huang ◽  
Chengfei Fan ◽  
Yuan Lin ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Bearing Capacity ◽  
Failure Mechanism ◽  
Cross Section ◽  
Failure Criterion ◽  
Failure Modes ◽  
Channel Cross Section ◽  
Fiber Layer ◽  
Flexural Bearing Capacity ◽  
Double Channel

Abstract In this study, the flexural bearing capacity and failure mechanism of carbon fiber-reinforced aluminum laminate (CARALL) beams with a double-channel cross-section and a 3/2 laminated configuration were experimentally and numerically studied. Two types of specimens using different carbon fiber layup configurations ([0°/90°/0°]3 and [45°/0°/−45°]3) were fabricated using the pressure molding thermal curing forming process. The double-channel CARALL beams were subjected to static three-point bending tests to determine their failure behaviors in terms of ultimate bearing capacity and failure modes. Owing to the shortcomings of the two-dimensional Hashin failure criterion, the user-defined FORTRAN subroutine VUMAT suitable for the ABAQUS/Explicit solver and an analysis algorithm were established to obtain a progressive damage prediction of the CFRP layer using the three-dimensional Hashin failure criterion. Various failure behaviors and mechanisms of the CARALL beams were numerically analyzed. The results indicated that the numerical simulation was consistent with the experimental results for the ultimate bearing capacity and final failure modes, and the failure process of the double-channel CARALL beams could be revealed. The ultimate failure modes of both types of double-channel CARALL beams were local buckling deformation at the intersection of the upper flange and web near the concentrated loading position, which was mainly caused by the delamination failure among different unidirectional plates, tension and compression failure of the matrix, and shear failure of the fiber layers. The ability of each fiber layer to resist damage decreased in the order of 90° fiber layer > 0° fiber layer > 45° fiber layer. Thus, it is suggested that 90°, 0°, and 45° fiber layers should be stacked for double-channel CARALL beams.

scholarly journals Compressive bearing capacity and failure mechanism of CFRP–aluminum laminate column with single-channel cross section

2021 ◽  
Vol 28 (1) ◽  
pp. 48-63
Author(s):  
Teng Huang ◽  
Dongdong Zhang ◽  
Jun Yang ◽  
Yuan Lin ◽  
Yaxin Huang
Keyword(s):  
Carbon Fiber ◽  
Bearing Capacity ◽  
Failure Mechanism ◽  
Cross Section ◽  
Failure Modes ◽  
Single Channel ◽  
Theoretical Method ◽  
Channel Cross Section ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced

Abstract The axial compressive bearing capacity, failure modes, and failure mechanisms of carbon fiber-reinforced aluminum laminate (CARALL) columns with single-channel cross sections were studied in detail. In this study, two types of short CARALL specimens with a 5/4 configuration were first fabricated using 2024-T3 aluminum alloy and different fiber orientations ([0°/90°/0°]3, [45°/0°/−45°]3) via a pressure-molding thermal-curing forming process. The short CARALL columns were then subjected to static loading tests to determine their axial compressive behaviors in terms of ultimate bearing capacity and failure modes. Thereafter, the user-defined FORTRAN subroutine VUMAT, which is based on ABAQUS, was used to investigate the failure mechanism of the proposed CARALL columns. Meanwhile, based on the classic laminated panel mechanics theory, a theoretical method was proposed to predict the safe bearing capacity of the designed compressive CARALL columns. The results indicated that the ultimate failure of both types of short CARALL columns was a strength failure caused by the delamination of the layers. When the short CARALL columns were subjected to an axial compressive load, the fiber spread angle of the carbon fiber-reinforced polymer prepregs in the laminate panels had a significant influence on the resistance to interlaminar delamination. A smaller fiber layer angle resulted in greater resistance to interlaminar delamination. Setting a certain number of fiber layers with angles between 0° and 45° could increase the toughness of the compression column member against interlaminar shear delamination at the initial stage. Comparisons of the experimental, numerical, and theoretical results demonstrated good agreement, indicating that the proposed theoretical method is feasible for predicting the safe bearing capacity of CARALL columns with a single-channel cross section and can be applied to the design of compressive laminate pillar components.

scholarly journals Reinforcement of concrete by composite materials

2018 ◽  
Vol 149 ◽  
pp. 01046
Author(s):  
Bensaid Boulekbache ◽  
Mostefa Hamrat ◽  
Nejma Imane Gacem ◽  
Kheltoum Halimi
Keyword(s):  
Composite Materials ◽  
Carbon Fiber ◽  
Mechanical Behavior ◽  
Bearing Capacity ◽  
Experimental Work ◽  
Failure Modes ◽  
Confined Concrete ◽  
Clear Indication ◽  
Bending Loading ◽  
Behavior Strength

This work was devoted to the material-scale study of the mechanical behavior of confined concrete by composite materials based on carbon fiber and glass under compression and bending loading. In this context, an experimental work on cylindrical and prismatic concrete specimens has been carried out. The obtained results permitted the identification of the mechanical behavior, strength, deformability and failure modes. The outcome of the present research indicates an increase in the bearing capacity and deformability in compression and in tension. The reinforcement by means of composite materials appears as a pertinent solution and therefore, makes it possible to obtain clear indication on the type of confinement to be considered according to the intended purpose.

Ultimate Flexural Bearing Capacity Research Based on Carbon Fiber Sheet to Reinforce Rough Sleeper Beam

2012 ◽  
Vol 226-228 ◽  
pp. 1766-1770
Author(s):  
Zhong Long Li ◽  
Hong Lin Wu ◽  
Zhen Yu Liu ◽  
De Jian Xu ◽  
Hong Jiang Gu ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Carbon Fiber ◽  
Bearing Capacity ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Construction Technology ◽  
Flexural Bearing Capacity ◽  
Fiber Sheet ◽  
Preliminary Study ◽  
Carbon Fiber Sheet

In this paper, it makes a preliminary study on the material of carbon fiber sheet to reinforce rough sleeper beam in order to enhance the magnitude of ultimate flexural bearing capacity. Considering the actual construction technology and environment, four reinforced concrete sleeper beams are used to experiment simulation to study the influence of carbon fiber sheet to ultimate flexural bearing capacity of reinforced concrete structures. Experiment results show that pasting two layers of carbon fiber sheet under reinforced concrete beam can have about a 25% increase in flexural bearing capacity.

scholarly journals Influence of Fissure Number on the Mechanical Properties of Layer-Crack Rock Models under Uniaxial Compression

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Yun-liang Tan ◽  
Wei-yao Guo ◽  
Tong-bin Zhao ◽  
Feng-hai Yu ◽  
Bin Huang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Bearing Capacity ◽  
Failure Mechanism ◽  
Uniaxial Compression ◽  
Rational Design ◽  
Failure Modes ◽  
Test Results ◽  
Active Stage ◽  
Engineering Project ◽  
Nonuniform Deformation

Many case studies have revealed that rock bursts generally occur in the high stress concentration area where layer-crack structures often exist, especially for brittle coal or rock masses. Understanding the mechanical properties of layer-crack rock models is beneficial for rational design and stability analysis of rock engineering project and rock burst prevention. This study experimentally investigated the influence of fissure number on the mechanical properties of layer-crack rock models through uniaxial compression tests. The digital speckle correlation method (DSCM) and acoustic emission (AE) techniques were applied to record and analyze the information of deformation and failure processes. Test results show the following: the bearing capacity of layer-crack specimen decreases compared with intact specimen, but their failure modes are similar, which are the splitting failure accompanied with local shear failure; the nonuniform deformation phenomenon begins to appear at the elastic deformation stage for layer-crack specimens; the AE behavior of intact specimens consists of three stages, that is, active stage, quiet stage, and major active stage, but for layer-crack specimens, it is characteristic by three peaks without quiet stage. In addition, as the fissure number of layer-crack specimens increases, the bearing capacity of specimens decreases, the appearing time of nonuniform deformation phenomenon in the specimen surface decreases, the AE events are denser and denser in each peak stage, and the risk of dynamic instability of layer-crack structure increases. At last, the failure mechanism of layer-crack structure and the related mitigation advices were discussed based on the test results. In general, the novelty is that this paper focuses on the failure mechanism of layer-crack structure directly.

Research on flexural behavior of composite box continuous girder with corrugated steel webs and trusses

2021 ◽  
pp. 136943322110339
Author(s):  
Jucan Dong ◽  
Yiyan Chen ◽  
Qingxiong Wu ◽  
Aoxiang Hu ◽  
Ruijuan Jiang ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Failure Modes ◽  
Concrete Slab ◽  
Flexural Behavior ◽  
Bending Moments ◽  
Test Beam ◽  
Steel Tubes ◽  
Element Analysis ◽  
Flexural Bearing Capacity ◽  
Negative Bending

A new type of composite structure, the composite box girder with corrugated steel webs (CSWs) and trusses, is proposed recently. In order to investigate the structural behavior under positive and negative bending moments, flexural tests of the continuous girder were carried out, and the failure modes, deformation patterns, strain distribution, and development of the concrete cracks were investigated. Finite element analysis was conducted to investigate the effect of the range of concrete in the steel tube and the thickness of CSWs on the flexural behavior. The experimental and numerical results show that the test beam has a good ductility and integrity under flexural load. The contribution of CSWs to the flexural bearing capacity is very small and can be neglected. Besides, the plane section assumption is still valid when only top concrete slab and bottom steel tubes are concerned. The concrete filled in bottom steel tubes increases the stiffness and the bearing capacity of the girder. Equations to calculate the flexural bearing capacity under positive and negative bending moments were put forward and then verified with experimental results.

Experimental Research on Concrete Beams Being Strengthened Jointly by External Prestressing and Carbon Fiber Sheet

2011 ◽  
Vol 71-78 ◽  
pp. 932-936
Author(s):  
Feng Guo Wang
Keyword(s):  
Carbon Fiber ◽  
Bearing Capacity ◽  
Experimental Research ◽  
Failure Modes ◽  
Concrete Beams ◽  
External Prestressing ◽  
Bending Resistance ◽  
Fiber Sheet ◽  
Carbon Fiber Sheet

Base on two groups of comparison tests of bearing capacity of three rectangle section of steel concrete beams with different strength grades, the research analyzed the effect of concrete beams strengthened by carbon fiber sheet and strengthened jointly by carbon fiber sheet and external prestressing on the bearing capacity, failure modes, strain states, rigidity and ductility.The results show that bending resistance of steel concrete beams strengthened jointly by carbon fiber sheet and external prestressing can be improved obviously, and the usage performance and strengthened effect are obvious too.

Experimental Study on Flexural Bearing Capacity of Reinforced Ceramsite Concrete Beam

2011 ◽  
Vol 366 ◽  
pp. 253-257
Author(s):  
Wei Jun Yang ◽  
Zheng Bo Pi ◽  
Zhen Lin Mo
Keyword(s):  
Bearing Capacity ◽  
Concrete Beam ◽  
Failure Modes ◽  
Concrete Beams ◽  
Cement Mortar ◽  
Reinforced Concrete Beams ◽  
Ordinary Concrete ◽  
Steel Bar ◽  
Steel Bars ◽  
Flexural Bearing Capacity

In order to investigate the flexural bearing capacity of reinforced ceramic concrete beams, static loading experiments were carried out. 10 ceramic reinforced concrete beams and 2 non-reinforced ceramic concrete with different steel ratios, cover thicknesses and bar diameters were fabricated. The gauges of concrete was arraged on the surfaces of section in mid-span and and steel gauges was arraged on the surfaces of steel bars. The loading device was consisted of a 200kN hydraulic jack, a distributive girder and reaction frame while the dial indicators was arraged in supports and mid-span. The strain of concrete and steel bar in different loading along with the crack,yield and utimate of load were recorded .It found that the stress-strain law, crack extension regularity , failure modes of specimens was similar to the ordinary concrete beams and the current procedures formulas about flexural bearing capacity is reliability. It also found that both ceramic aggregate and cement mortar were crushed for the perfectly bonding of the interface and the strength of aggregate was to be fully utilized.

Experimental Study on Properties of Side Joint between Superimposed Slabs with Lattice Steel Bars

2014 ◽  
Vol 638-640 ◽  
pp. 109-114
Author(s):  
Xian Guo Ye ◽  
Kai Nan Yang ◽  
Xun Chong ◽  
Qing Jiang
Keyword(s):  
Bearing Capacity ◽  
Cross Section ◽  
Static Loading ◽  
Failure Modes ◽  
Service Condition ◽  
Shear Capacity ◽  
Test Results ◽  
Bending Performance ◽  
Remarkable Effect ◽  
Steel Bars

Mechanical properties of joint between superimposed slabs have a remarkable effect on the bending performance of the whole slab. To study the bending performance of superimposed slabs with different forms of joint, six superimposed slabs were designed and produced. Based on the static loading experiment, load was concentrated on two three-equal-division points, bearing capacity, deformation, cracks of specimens were obtained. Whether there were lattice steel bars in the precast slab or not and different reinforcement in the joint were considered to study the bending performance. The test results show that the failure mode of slab without lattice steel bars is brittle while others are ductile. Lattice steel bars can control the development of cracks along the superposed surface, increasing the shear capacity and improving the ductility of specimens. The bearing capacity of the whole superimposed slab depends on the joint cross section. The joint would not generate a difference to the deflection curves in service condition. When reinforcement in the joint is strengthened, failure modes of slabs will be effectively improved.

Calculation Method of Flexural Bearing Capacity of Carbon Fiber Reinforced Concrete Beam

2011 ◽  
Vol 71-78 ◽  
pp. 5080-5083
Author(s):  
Le Zhou ◽  
Hong Tao Liu
Keyword(s):  
Reinforced Concrete ◽  
Carbon Fiber ◽  
Bearing Capacity ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Flexural Bearing Capacity ◽  
Carbon Fiber Reinforced ◽  
Fiber Materials

To study further mechanical behavior of flexural members of carbon fiber reinforced concrete, this text uses the methods of fiber materials composite principles and balance equations, and derives the elastic modulus of the carbon fiber concrete. The acting principle of carbon fiber in the concrete is analyzed. Based on three bearing stages of carbon fiber reinforced concrete beam, the calculation formulas to flexural bearing capacity of carbon fiber reinforced concrete are given. It is theoretical basis of implication of carbon fibers in civil engineering.

scholarly journals Flexural Behavior of Polyurethane Concrete Reinforced by Carbon Fiber Grid

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5421
Author(s):  
Hongjian Ding ◽  
Quansheng Sun ◽  
Yanqi Wang ◽  
Dongzhe Jia ◽  
Chunwei Li ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Bearing Capacity ◽  
Failure Strain ◽  
Flexural Behavior ◽  
Bending Test ◽  
Expansion Joints ◽  
Rapid Repair ◽  
Concrete System ◽  
Repair Materials ◽  
Flexural Bearing Capacity

In view of the problems of traditional repair materials for anchorage concrete of expansion joints, such as ease of damage and long maintenance cycles, the design of polyurethane concrete was optimized in this article, which could be used for rapid repair of concrete in anchorage zone of expansion joints. A new type of carbon fiber grid–polyurethane concrete system was designed, which makes the carbon fiber grid have an excellent synergistic effect with the quick-hardening and high-strength polyurethane concrete, and improved the flexural bearing capacity of the polyurethane concrete. Through the four-point bending test, the influence of the parameters such as the number of grid layers, grid width, and grid density on the flexural bearing capacity of polyurethane concrete beams was tested. The optimum preparation process parameters of carbon fiber grid were obtained to improve the flexural performance of polyurethane concrete. Compared with the Normal specimen, C-80-1’s average flexural strength increased by 47.7%, the failure strain along the beam height increased by 431.1%, and the failure strain at the bottom of the beam increased by 68.9%. The best width of the carbon fiber grid was 80 mm, and the best number of reinforcement layers was one layer. The test results show that the carbon fiber grid could improve the flexural bearing capacity of polyurethane concrete. The carbon fiber grid–polyurethane concrete system provides a new idea for rapid repair of the anchorage zone of bridge expansion joints, and solves the problems such as ease of damage and long maintenance cycles of traditional repair materials, which can be widely used in the future.

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