Two new composite plate elements with bond–slip effect for nonlinear finite element analyses of FRP-strengthened concrete slabs

The structural performance of reinforced concrete relies heavily on the bond between reinforcement and concrete. In nonlinear finite element analyses, bond is either modelled by merged, also called perfect bond, or coincident with slip, also called bond-slip, approaches. Here, the performance of these two approaches for the modelling of failure of reinforced concrete was investigated using a damage-plasticity constitutive model in LS-DYNA. Firstly, the influence of element size on the response of tension-stiffening analyses with the two modelling approaches was investigated. Then, the results of the two approaches were compared for plain and fibre reinforced tension stiffening and a drop weight impact test. It was shown that only the coincident with slip approach provided mesh insensitive results. However, both approaches were capable of reproducing the overall response of the experiments in the form of load and displacements satisfactorily for the meshes used.

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On the Numerical Modelling of Bond for the Failure Analysis of Reinforced Concrete

10.20944/preprints201704.0118.v1 ◽

2017 ◽

Author(s):

Peter Grassl ◽

Morgan Johansson ◽

Joosef Leppänen

Keyword(s):

Finite Element ◽

Reinforced Concrete ◽

Impact Test ◽

Nonlinear Finite Element ◽

Structural Performance ◽

Finite Element Analyses ◽

Tension Stiffening ◽

Bond Slip ◽

Element Size ◽

Weight Impact

The structural performance of reinforced concrete relies heavily on the bond between reinforcement and concrete. In nonlinear finite element analyses, bond is either modelled by merged, also called perfect bond, or coincident with slip, also called bond-slip, approaches. Here, the performance of these two approaches for the modelling of failure of reinforced concrete was investigated using a damage-plasticity constitutive model in LS-DYNA. Firstly, the influence of element size on the response of tension-stiffening analyses with the two modelling approaches was investigated. Then, the results of the two approaches were compared for plain and fibre reinforced tension stiffening and a drop weight impact test. It was shown that only the coincident with slip approach provided mesh insensitive results. However, both approaches were capable of reproducing the overall response of the experiments in the form of load and displacements satisfactorily for the meshes used.

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Nonlinear Finite Element Analyses of FRP-Strengthened Concrete Slabs under Fixed-Point Cyclic Loading

Journal of Composites for Construction ◽

10.1061/(asce)cc.1943-5614.0000519 ◽

2015 ◽

Vol 19 (3) ◽

pp. 04014057 ◽

Cited By ~ 4

Author(s):

Xiaodan Teng ◽

Y. X. Zhang

Keyword(s):

Finite Element ◽

Fixed Point ◽

Cyclic Loading ◽

Nonlinear Finite Element ◽

Concrete Slabs ◽

Finite Element Analyses

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Design of flexure revolute joint based on compliance and stiffness ellipsoids

Proceedings of the Institution of Mechanical Engineers Part G Journal of Aerospace Engineering ◽

10.1177/09544100211016978 ◽

2021 ◽

pp. 095441002110169

Author(s):

Jing Zhang ◽

Hong-wei Guo ◽

Juan Wu ◽

Zi-ming Kou ◽

Anders Eriksson

Keyword(s):

Finite Element ◽

Single Point ◽

Synthesis Method ◽

Nonlinear Finite Element ◽

Finite Element Analyses ◽

Rotational Stiffness ◽

Rotational Angle ◽

Parameterized Model ◽

Flexure Joints ◽

Translational Stiffness

In view of the problems of low accuracy, small rotational angle, and large impact caused by flexure joints during the deployment process, an integrated flexure revolute (FR) joint for folding mechanisms was designed. The design was based on the method of compliance and stiffness ellipsoids, using a compliant dyad building block as its flexible unit. Using the single-point synthesis method, the parameterized model of the flexible unit was established to achieve a reasonable allocation of flexibility in different directions. Based on the single-parameter error analysis, two error models were established to evaluate the designed flexure joint. The rotational stiffness, the translational stiffness, and the maximum rotational angle of the joints were analyzed by nonlinear finite element analyses. The rotational angle of one joint can reach 25.5° in one direction. The rotational angle of the series FR joint can achieve 50° in one direction. Experiments on single and series flexure joints were carried out to verify the correctness of the design and analysis of the flexure joint.

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