Concrete Damage Plasticity Model for Modeling FRP-to-Concrete Bond Behavior

Teng

et al. 2015

Computers & Structures

a b s t r a c tThis paper is concerned with the finite element simulation of debonding failures in FRP-strengthened concrete beams. A key challenge for such simulations is that common solution techniques such as the Newton-Raphson method and the arc-length method often fail to converge. This paper examines the effectiveness of using a dynamic analysis approach in such FE simulations, in which debonding failure is treated as a dynamic problem and solved using an appropriate time integration method. Numerical results are presented to show that an appropriate dynamic approach effectively overcomes the convergence problem and provides accurate predictions of test results.

Section: Discussionmentioning

confidence: 99%

Finite element modeling of debonding failures in FRP-strengthened RC beams: A dynamic approach

Teng

et al. 2015

Computers & Structures

International Journal of Polymer Science

“…Its Young's modulus is accordingly obtained by ensuring that the axial stiffness of FRP in the simulations is the same as that in the tests because the debonding behavior only occurs in the body of concrete around the FRP-concrete bonded joint [19,21,34]. …”

Section: Modelling Of Frpmentioning

confidence: 99%

“…In addition to extensive experimental and analytical studies [17], mesoscale finite element modelling, in which fine elements are used and FRP elements share nodes with adjacent concrete elements, has been employed in a number of studies [18][19][20][21]. Lu et al (2006) [20] first proposed such a mesoscale FE modelling on FRP-concrete bonded joint to develop a bond-slip model for FRP-concrete interfaces.…”

Section: Introductionmentioning

confidence: 99%

“…They believed that such a mesoscale FE modelling as a necessary complementary approach to experiment studies could provide detailed information on bond behavior of FRPconcrete bonded joints and is essential for deep insights into bond behavior of FRP-concrete bonded joints. Recently, [21] developed a simple but robust FE model under the frame of concrete damage plasticity model to investigate the bond behavior of FRP-concrete bonded joint. An (2015) [22] and [18] extended model [21] for investigating the bond mechanism of FRP-concrete bonded joint under a quasi-static loads.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, [21] developed a simple but robust FE model under the frame of concrete damage plasticity model to investigate the bond behavior of FRP-concrete bonded joint. An (2015) [22] and [18] extended model [21] for investigating the bond mechanism of FRP-concrete bonded joint under a quasi-static loads. In An (2015) [22], a numerical damping system is required in a mesoscale FE modelling to eliminate the dynamic effects arising from concrete cracking in the damaging process; otherwise it is impossible to achieve a satisfactory result under quasi-static loads.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Mesoscale Modelling of Bond Behavior at FRP-Concrete under Mode II Loading: Effect of Rayleigh Damping

Xiao

et al. 2017

The paper mainly focuses on the study of the effects of Rayleigh damping in the simulations of FRP-concrete bonded joints, thereby proposing an approach to determine the value of its appropriate Rayleigh damping. Specifically, the element tests under Mode I and Mode II fracture modes were first carried out to investigate the effects of the mass proportional Rayleigh damping and the stiffness proportional Rayleigh damping. An FRP-concrete bonded joint is then employed to further investigate the effects of Rayleigh damping on the simulation results under Mode II fracture mode. It is shown that low-frequency vibrations are produced in the simulations of the specimens loaded by Mode I loading and could be damped by the mass proportional Rayleigh damping, while high-frequency vibrations are produced in the simulations of the specimens loaded by Mode II loading and could only be damped by the stiffness proportional Rayleigh damping. It also shows that the stiffness proportional damping is essential to damp out the oscillations in such simulations, thereby improving the convergence. In addition, the procedure proposed in this paper can lead to a proper interval for the value of the stiffness proportional Rayleigh damping, beyond which an unreasonable simulation result may be obtained.

Numerical Investigation of Shear Connection in Cold‐formed Steel‐concrete Composite Beam

et al. 2022

Researches show that composite systems made by combining cold‐formed steel (CFS) elements and concrete can produce excellent properties compared to traditional solutions. One of the solution which employs CFS elements and concrete is the subject of research within the LWT‐FLOOR project. The LWT‐FLOOR system consists of built‐up CFS beams with corrugated web, connected by spot welds and concrete slab with an innovative shear connection. This paper presents a numerical investigation of two types of shear connections suitable for the proposed composite solution. One type of shear connection is completed using bolts which provide a direct shear connection between the flange profiles of the steel girder and the concrete slab. The second type of shear connection is achieved using a composite dowel rib connector realised through a steel beam corrugated web. In this case, the connection between the profiles of the steel beam and the concrete flange is realised indirectly, i.e., through spot welds between C profiles and corrugated web. The results of FE simulations indicate that a solution with bolts ensures higher shear, but reduces its ductility. These results provide the basis for the conduction of experimental push‐out tests of the proposed shear connection types.