scholarly journals Bond Behaviour of Near-Surface Mounted Strips in RC Beams—Experimental Investigation and Numerical Simulations

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4362
Author(s):  
Renata Kotynia ◽  
Hussien Abdel Baky ◽  
Kenneth W. Neale
Keyword(s):  
Concrete Strength ◽  
Element Model ◽  
Steel Reinforcement ◽  
Reinforcement Ratio ◽  
Experimental Program ◽  
Fe Model ◽  
Bond Behaviour ◽  
Near Surface ◽  
Cfrp Laminates ◽  
Near Surface Mounted

This paper presents an investigation of the bond mechanism between carbon fibre reinforced polymer (CFRP) laminates, concrete and steel in the near-surface mounted (NSM) CFRP-strengthened reinforced concrete (RC) beam-bond tests. The experimental program consisting of thirty modified concrete beams flexurally strengthened with NSM CFRP strips was published in. The effects of five parameters and their interactions on the ultimate load carrying capacities and the associated bond mechanisms of the beams are investigated in this paper with consideration of the following investigated parameters: beam span, beam depth, longitudinal tensile steel reinforcement ratio, the bond length of the CFRP strips and compressive concrete strength. The longitudinal steel reinforcement was cut at the beam mid-span in four beams to investigate a better assessment of the influence of the steel reinforcement ratio on the bond behaviour of CFRP to concrete bond behaviour. The numerical analysis implemented in this paper is based on a nonlinear micromechanical finite element model (FEM) that was used for investigation of the flexural behaviour of NSM CFRP-strengthened members. The 3D model based on advanced CFRP to concrete bond responses was introduced to modelling of tested specimens. The FEM procedure presents the orthotropic behaviour of the CFRP strips and the bond response between the CFRP and concrete. Comparison of the experimental and numerical results revealed an excellent agreement that confirms the suitability of the proposed FE model.

Experimental Study on the Flexural Behavior of Stone Slabs with near Surface Mounted Steel Bar

2014 ◽  
Vol 919-921 ◽  
pp. 128-132
Author(s):  
Er Xiang Dong ◽  
Zhong Fan Chen ◽  
Ming Xu
Keyword(s):  
Ductile Failure ◽  
Steel Reinforcement ◽  
Reinforcement Ratio ◽  
Flexural Behavior ◽  
Test Results ◽  
Near Surface ◽  
Steel Bar ◽  
Test Parameters ◽  
Stone Slab ◽  
Near Surface Mounted

Six stone slabs with near surface mounted steel bar were tested to study the flexural behavior of stone slab. The test parameters included the slotting dimension and steel reinforcement ratio. The test results show that the measure of near surface mounted steel bar can significantly increase the flexural capacity and ultimate deflection. The flexural behavior of stone slabs with near surface mounted steel bar is less affected by the slotting dimension; steel reinforcement ratio is the important factor influencing flexural behavior. With higher steel reinforcement ratio, the failure mode has transformed from brittle fracture into ductile failure; cracking load, ultimate load and displacement are largely increased by 10.2%131.9%617%. The mid-span section strain distribution complies with the plane-section assumption. Stone slabs with near surface mounted steel bar can fully exert the strength of stone and steel bar.

Simulation Analysis on Repair of Concrete Beams Using Near-Surface Mounted GFRP Bars

2011 ◽  
Vol 243-249 ◽  
pp. 5496-5500
Author(s):  
Hai Xia Zhang ◽  
Guo Rui Liu ◽  
Peng Peng Cao
Keyword(s):  
Simulation Analysis ◽  
Great Influence ◽  
Element Model ◽  
Steel Reinforcement ◽  
Flexural Behavior ◽  
Near Surface ◽  
Gfrp Bars ◽  
Near Surface Mounted ◽  
Embedment Length ◽  
Frp Bars

This paper focuses on the characterization of flexural behavior of RC beams strengthened with Near-Surface Mounted (NSM) GFRP bars. Based on ABAQUS, the finite element model for the flexural behavior is established and the simulated results are compared with the test results. The parameters including the amount of GFRP bars, the embedment length of GFRP bars, the types of FRP bars, and the ratio of internal steel reinforcement in the beam for the flexural behavior are discussed. The simulated results show that there has a good agreement with the experiment results. The beams strengthened with NSM GFRP bars have a significant improvement in flexural stiffness and bending capacity. Further more, the analysis results on the parameters indicate that ultimate bearing capacity of the beam strengthened with NSM-GFRP bars gradually increases with the amount of FRP bars and the ratio of the longitudinal steel reinforcement. The mode of failure of the beam strengthened with the smaller embedment length of GFRP bars is not the rupture of GFRP bars. The different types of FRP bars have a great influence on the load-deflection curves of the beams.

Study on flexural behaviour of glulam beams reinforced by Near Surface Mounted (NSM) CFRP laminates

2015 ◽  
Vol 91 ◽  
pp. 23-31 ◽  
Author(s):  
Weidong Lu ◽  
Zhibin Ling ◽  
Qifan Geng ◽  
Weiqing Liu ◽  
Huifeng Yang ◽  
...  
Keyword(s):  
Flexural Behaviour ◽  
Near Surface ◽  
Cfrp Laminates ◽  
Near Surface Mounted

An assessment of the Sachs method for measuring residual stresses in cold worked fastener holes

1998 ◽  
Vol 33 (4) ◽  
pp. 263-274 ◽  
Author(s):  
D J Smith ◽  
C G C Poussard ◽  
M J Pavier
Keyword(s):  
Finite Element ◽  
Residual Stresses ◽  
Cold Working ◽  
Element Model ◽  
Fe Model ◽  
Working Process ◽  
Element Analysis ◽  
Near Surface ◽  
Cold Worked ◽  
Good Agreement

Measurements of residual stresses in 6 mm thick aluminium alloy 2024 plates containing 4 per cent cold worked fastener are made using the Sachs method. The measurements are made on discs extracted from the plates. The measured tangential residual stress distribution adjacent to the hole edge are found to be affected by the disc diameter. The measured residual stresses are also in good agreement with averaged through-thickness predictions of residual stresses from an axisymmetric finite element (FE) model of the cold working process. A finite element analysis is also conducted to simulate disc extraction and then the Sachs method. The measured FE residual stresses from the Sachs simulation are found to be in good agreement with the averaged through-thickness predicted residual stresses. The Sachs simulation was not able to reproduce the detailed near-surface residual stresses found from the finite element model of the cold working process.

NONLINEAR FINITE ELEMENT ANALYSIS OF FRP STRENGTHENED RC BEAMS

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Prabin Pathak ◽  
Y. X. Zhang
Keyword(s):  
Finite Element ◽  
Plastic Material ◽  
Experimental Studies ◽  
Material Model ◽  
Element Model ◽  
Steel Reinforcement ◽  
Elastic Model ◽  
Fe Model ◽  
Rc Beams ◽  
Element Analysis

A simple, accurate and efficient finite element model is developed in ANSYS for numerical modelling of the nonlinear structural behavior of FRP strengthened RC beams under static loading in this paper. Geometric nonlinearity and material non-linear properties of concrete and steel rebar are accounted for this model. Concrete and steel reinforcement are modelled using Solid 65 element and Link 180 element, and FRP and adhesive are modelled using Shell 181element and Solid 45 element. Concrete is modelled using Nitereka and Neal’s model for compression, and isotropic and linear elastic model before cracking with strength gradually reducing to zero after cracking for tension. For steel reinforcement, the elastic perfectly plastic material model is used. FRPs are assumed to be linearly elastic until rupture and epoxy is assumed to be linearly elastic. The new FE model is validated by comparing the computed results with those obtained from experimental studies.

Dynamic complex modulus predictions of hot-mix asphalt using a micromechanical-based finite element model

2007 ◽  
Vol 34 (12) ◽  
pp. 1519-1528 ◽  
Author(s):  
Zhanping You ◽  
Qingli Dai
Keyword(s):  
Finite Element ◽  
Hot Mix Asphalt ◽  
Complex Modulus ◽  
Asphalt Binder ◽  
Viscoelastic Behavior ◽  
Element Model ◽  
Discrete Element Modelling ◽  
Experimental Program ◽  
Fe Model ◽  
Different Temperatures

A micromechanical-based finite element (FE) model was used to predict the dynamic complex modulus ( E*) of the hot-mix asphalt (HMA). The microstructure of HMA was captured with a high resolution scanner. Two material phases (aggregates and sand mastic) of HMA were modelled with finite elements. The sand mastic herein was composed of fines and asphalt binder with some fine aggregates. The dynamic complex modulus of the sand mastic under different temperatures and loading frequencies was measured in an experimental program. The corresponding principles were applied to bridge the elastic simulation and viscoelastic behavior with the input of the viscoelastic mastic properties. The input parameters in the FE model include the dynamic complex modulus of the sand mastic, the elastic modulus of the aggregates, and the microstructure of the HMA. The E* values of the HMA were measured and used to compare the E* predicted from the FE model. It is found that the FE approach used in this paper has the ability to predict HMA dynamic modulus across a range of temperatures and loading frequencies. The FE prediction of the E* was compared with a recently developed discrete element modelling approach and found the E* prediction from these two approaches to be very similar.

scholarly journals Bond behaviour of ribbed near-surface-mounted iron-based shape memory alloy bars with short bond lengths

2020 ◽  
Vol 191 ◽  
pp. 108647 ◽  
Author(s):  
Bernhard Schranz ◽  
Christoph Czaderski ◽  
Thomas Vogel ◽  
Moslem Shahverdi
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Bond Behaviour ◽  
Near Surface ◽  
Bond Lengths ◽  
Short Bond ◽  
Near Surface Mounted ◽  
Iron Based

scholarly journals Numerical Modeling of Earthquake-Damaged Circular Bridge Columns Repaired Using Combination of Near-Surface-Mounted BFRP Bars with External BFRP Sheets Jacketing

Materials ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 258 ◽  
Author(s):  
Xing-Gui Zeng ◽  
Shao-Fei Jiang ◽  
Xin-Cheng Xu ◽  
Hai-Sheng Huang
Keyword(s):  
Numerical Modeling ◽  
Numerical Models ◽  
Basalt Fiber ◽  
Fiber Reinforced Polymer ◽  
Experimental Program ◽  
Near Surface ◽  
Reinforced Polymer ◽  
Near Surface Mounted ◽  
Damage Accumulation Model ◽  
Good Agreement

This paper reports the numerical simulation of earthquake-damaged circular columns repaired with the combination of near-surface-mounted (NSM) basalt fiber reinforced polymer (BFRP) bars with external BFRP sheets jacketing at quasi-static loading. The numerical modeling was carried out with the nonlinear OpenSees software platform by using the BeamWithHinges element. In the simulations, the effect of the previous earthquake damage on the behavior of the repaired columns was taken into account, and a simple and effective material damage-accumulation model is proposed to modify the constitutive of materials in the unrepaired regions of the repaired columns. The developed numerical models were validated by comparing their quasi-static findings with those obtained from a previous experimental program, and a good agreement can be observed. Furthermore, the efficiency of the repair technique used in tests is evaluated via the developed numerical model.

Sign in / Sign up

Export Citation Format

Share Document