Numerical Modelling of Foamed Concrete Beam under Flexural Using Traction-Separation Relationship

This paper focuses on the investigation of the material properties of FC500 foam concrete. Innovation is very important for the solution of cast-in-place concrete forms in practice today. Part of its innovative construction application is the possibility of using foam concrete in a composite structure and the use of its mechanical properties in the load-bearing parts of civil engineering structures. The method of detecting the mechanical properties of foam concrete by using non-standard cantilever test is also innovative. Here, an advanced approach of modelling specimens using powerful computational systems based on the finite element method is used. This modern material is researched especially for its use in transportation structures. For its application, it is necessary to define its resistance to mechanical loads. The main content of the research consists of correlations between experimental measurements and analytical and numerical results. This is the principle of quasi-linear identification of the non-linear behavior of polymeric cementitious porous material during tests on specimens. The focus of the research is an extensive experiment: measurements of the deformation of the specimens until failure. The following methods were chosen to investigate the material properties: small cantilever test, standard tensile test and compression test. The cantilever test was performed for the individual components of the FC500 composite and cement concrete, but also as a compact composite. Numerical simulation models were developed to correlate the individual results in order to validate the uniaxial test results. The conclusions of the research led to the definition of standardized stress–strain diagrams of the FC500 material for compression and especially tension. This is a definition of the behavior of this polymer composite, usable for the development of numerical models of full-scale structures. The results of the research will be applied in the development of national standards for the use of advanced materials in transportation structures (cycle paths, parking lots, traffic playgrounds, lightly trafficked forest roads and trails, etc.).

show abstract

“…[n]{u} − {u} p n = {0} na Ss + Sp (29) where the matrix [C] is the material's compliance matrix [18]:…”

Section: Kinematic Boundary Conditionsmentioning

confidence: 99%

Polymer Foam Concrete FC500 Material Behavior and Its Interaction in a Composite Structure with Standard Cement Concrete Using Small Scale Tests

2022

View full text Add to dashboard Cite

show abstract

“…The result showed that the VCCT is more sensitive compared to the XFEM and CZM. Meanwhile, Omar et al [29] worked on foam concrete beams using the XFEM and CZM and found that there was less agreement within the CZM due to the simplification of adopting a failure path. However, the LEFM theory adopted within the ABAQUS software is only applicable for materials that have a relatively small plastic process zone [30].…”

Section: Introductionmentioning

confidence: 99%

Application of Bilinear Softening Laws and Fracture Toughness of Foamed Concrete

Maulana

Ahmad

Sugiman

2023

Construction Materials

View full text Add to dashboard Cite

This study examined the fracture and failed performance of foamed concrete materials by testing normalized notched beams under three-point bending via three methods: inverse analysis, digital image correlation (DIC), and finite element modeling (FEM). It also discussed both experimental and FEM characteristics. However, inverse analysis is only applicable for specimens with a notch height of 30 mm. Bilinear softening of the tested beams was estimated to identify the fracture energy (GF), critical crack length (ac), and elastic modulus (E). Additionally, the fracture toughness was calculated by adopting the double-K method (initiation fracture, unstable fracture, and cohesive fracture). Two-dimensional FEA modeling of the fracture was conducted using the traction-separation law (TSL), incorporating the extended finite element method (XFEM) and cohesive zone (CZM) techniques. A finite element sensitivity for the XFEM and CZM was performed, with the global mesh size of 2 and the damage stabilization cohesion of 1 × 10−5 showed good convergence and were used in other models. Further comparison of the DIC experiment findings with those from the FEM demonstrated good agreement in terms of crack propagation simulation.

show abstract

“…Various modelling techniques can be incorporated with TSL, such as the extended finite element method (XFEM), virtual crack closure technique (VCCT) and cohesive zone model (CZM). A study by H. Ahmad et al, (2021) and Structures, 2022, 19(6), e460 3/12 bending foam concrete beam using XFEM and CZM method and found that XFEM performed better than the CZM in predicting the load capacity. While Yu et al, (2021) simulating beam nuclear graphite by using the XFEM, the CZM and the VCCT methods.…”

Section: Introductionmentioning

confidence: 99%

XFEM Modelling and Experimental Observations of Foam Concrete Beam Externally-Bonded with KFRP Sheet

Maulana

Sugiman

Ahmad

et al. 2022

Lat. Am. j. solids struct.

View full text Add to dashboard Cite

This paper investigates the effect of KFRP composite sheets as a strengthening material in improving the loadcarrying resistance of lightweight foam concrete beams using a FEA modelling framework. The study employed three parametric strengthening schemes (i.e., KFRP length, woven architecture types and KFRP thickness). Twenty-seven beam specimens were tested, and respective failure modes and ultimate load at failure were discussed. All the strengthened beam specimens failed mostly in shear mode and, to a lesser extent, in FRP fracture. Despite the absence of de-bonding failure, improvement of strengthening using KFRP sheet technique was exhibited. Later, Extended Finite Element Method (XFEM) Modelling was incorporated following failure mode exhibited. Strength predictions incorporating the traction-separation relationship using XFEM techniques. Validation work with experimental datasets showed good agreements with average discrepancies of less than 10%. The numerical approach can be used as a strength prediction tool in concrete beams with externally bonded FRPs.

show abstract

Numerical Modelling of Foamed Concrete Beam under Flexural Using Traction-Separation Relationship

Cited by 5 publications

References 19 publications

Polymer Foam Concrete FC500 Material Behavior and Its Interaction in a Composite Structure with Standard Cement Concrete Using Small Scale Tests

Polymer Foam Concrete FC500 Material Behavior and Its Interaction in a Composite Structure with Standard Cement Concrete Using Small Scale Tests

Application of Bilinear Softening Laws and Fracture Toughness of Foamed Concrete

XFEM Modelling and Experimental Observations of Foam Concrete Beam Externally-Bonded with KFRP Sheet

Contact Info

Product

Resources

About