scholarly journals Discrete finite element model of reactive powder concrete columns confined with fiber reinforced polymer

2021 ◽  
Vol 15 (2) ◽  
pp. 8178-8192
Author(s):  
Muhammad Abbassi ◽  
Hooshang Dabbagh
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Concrete Columns ◽  
Element Model ◽  
Fiber Reinforced Polymer ◽  
Reactive Powder Concrete ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Proposed Model ◽  
Reactive Powder

Numerous finite element methods have been widely used to predict the response of normal/high strength concrete columns confined with Fiber Reinforced Polymer (FRP) under different loading conditions. In this regard, simulating the response of FRP-confined reactive powder concrete (RPC) columns has been less emphasized. The present study aimed to propose a finite element model based on fiber finite element methodology in order to predict the behavior of FRP confined RPC columns under axial compressive load with different eccentricities. The columns were modeled with a nonlinear beam-column element with two nodes with distributed plasticity. In addition, the proposed finite element model in the present study indicated its simplicity, low computational efforts, and flexibility by adopting a perfect bond between RPC and FRP. Further, the obtained results from the finite element analysis were compared to those from available tested specimens. Based on the comparisons, the proposed model can provide highly satisfactory predictions. Finally, the proposed model can be useful for efficient applications in practical engineering projects.

Delamination Detection-Oriented Finite Element Model for a Fiber Reinforced Polymer Bonded Concrete Plate and Its Application With Vibration Measurements

2006 ◽  
Vol 74 (2) ◽  
pp. 240-248 ◽  
Author(s):  
D. Wu ◽  
S. S. Law
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Fiber Reinforced Polymer ◽  
Element Formulation ◽  
Fiber Reinforced ◽  
Vibration Measurements ◽  
Frp Composites ◽  
Concrete Plate ◽  
Reinforced Polymer

Delamination is a common type of damage in laminated fiber-reinforced polymer (FRP) composites. As FRP composites are becoming popular in upgrading and strengthening of civil concrete structures, the specific delamination damage, i.e., the FRP-concrete debonding, is considered more critical than inter-laminar delamination occurring in the FRP composites. A finite element formulation on the FRP-bonded concrete plate with this type of delamination fault is developed in the context of non-destructive evaluation from vibration measurements and compared with a two-layer solid element model. An adhesive interface where possible debonding could occur is introduced between the FRP and the concrete plates. A scalar damage parameter characterizing the delamination is incorporated into the formulation of a finite element model that is compatible with the vibration-based damage identification procedure. The formulated model is then applied to the prediction of FRP-concrete delaminations from modal test results based on the sensitivity analysis of uniform load surface curvature, which has been previously proposed by the authors. The validity of the methodology is demonstrated in two numerical examples. The first one is used to check the model accuracy, while the second one assesses the efficiency of the model-based identification method.

Modal frequencies of fiber-reinforced polymer pipes with wall-thinning using a wavelet-based finite element model

2014 ◽  
Vol 229 (13) ◽  
pp. 2377-2386 ◽  
Author(s):  
Yehia A Khulief ◽  
Mohamed A El-Gebeily ◽  
Wasiu A Oke ◽  
Wael H Ahmed
Keyword(s):  
Finite Element ◽  
Natural Frequencies ◽  
Internal Surface ◽  
Surface Damage ◽  
Element Model ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Dominant Type ◽  
Reinforced Polymer ◽  
Wall Thinning

Wall-thinning due to chemical reactions, heat, erosion, or a combination of such influences is the most dominant type of internal surface damage in piping systems. In order to examine the effect of wall-thinning on the natural frequencies, the elastodynamic model of the fiber-reinforced polymer pipe is formulated using a wavelet-based finite element method. In this context, a new set of Hermite shape functions is developed. The generalized eigen value problem is solved and the natural frequencies are obtained for an fiber-reinforced polymer pipe with different depths and locations of the wall-thinning. Moreover, the effect of wall-thinning on the modal frequencies of the pipe was verified experimentally. Both the analytical and experimental results demonstrate the potential of using vibration signature to detect internal surface damage in fiber-reinforced polymer pipes.

Theoretical modeling and experimental verification of co-curing carbon fiber-reinforced polymer hat-stiffened panels with silicone airbag male mandrels

2020 ◽  
pp. 096739112092164
Author(s):  
Shuai Zhu ◽  
Wenfei Peng
Keyword(s):  
Finite Element ◽  
Carbon Fiber ◽  
Element Model ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Stiffened Panels ◽  
Reinforced Polymer ◽  
New Process ◽  
Carbon Fiber Reinforced

For closed-hole panels such as hat-stiffened panels, it is inevitable to use mandrels during the manufacturing process. However, the uniformity of pressure transmission of the silicone rubber mandrel with the prefabricated hole is not good, the vacuum bag mandrel is easy to be broken and wrinkled, the water-soluble mandrel is high in cost, and the invar steel metal mandrel is difficult to demold. To solve these problems, this article proposed a new method for co-curing carbon fiber-reinforced resin matrix composite hat-stiffened panels by using a silicone airbag as a mandrel through autoclaves. Firstly, the thermo-force-flow multi-field coupling finite element model of co-curing carbon fiber-reinforced polymer (CFRP) hat-stiffened panels was established by using finite element software. The co-curing process of hat-stiffened panels was simulated and studied. The influence of different thickness of silicone airbag mandrels on the wall thickness and pressure of the workpiece were found to be relatively uniform in the new process. Then, the autoclave experiment was carried out to verify the correctness of the finite element model. Lastly, the interfacial bonding strength test was carried out to verify the mechanical properties of the parts. In summary, the practicability of co-curing CFRP hat-stiffened panels with silicone airbag male mandrels was proved in this article. The precision of CFRP hat-stiffened panel was efficiently promoted by this new process.

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