Gumilang Jati, Dinar (2026) MODEL MATERIAL ELEMEN LEKATAN RIGID BODY SPRING MODEL (RBSM) ANTARA CARBON FIBER REINFORCED POLYMER (CFRP) DENGAN BETON. Doctoral thesis, UNDIP.

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Abstract

The application of Carbon Fiber Reinforced Polymer (CFRP) sheets for external
reinforcement is crucial in modern structural engineering, particularly in enhancing and
restoring structural performance. The advantage of this material is that, in addition to
having high tensile strength, it is easy to apply as a strengthening material, offering high
corrosion and fatigue resistance. Externally bonded CFRP systems are often unable to
achieve their optimal capacity due to debonding failure, due to detachment of CFRP from
the concrete surface. A literature review on the debonding phenomenon of CFRP external
reinforcement has been conducted, with most studies based on direct shear and normal
tensile testing. Shear response through flexural testing mechanisms at the CFRP
interphase is rarely observed, and information on this shear behavior is limited. The
implementation of the bond model of CFRP and concrete is generally obtained through
experimental testing and simulation using the Finite Element Method (FEM).
In this research, the material model of the bond element between CFRP and
concrete is innovated using the Rigid Body Spring Model (RBSM) simulation, a numerical
approach based on the Discrete Element Method (DEM), with validation conducted
through experimental testing. Experimental testing was performed to investigate the
shear response and failure behavior of the CFRP interphase. This involved flexural
testing of concrete beams with dimensions of 2000 x 150 x 250 mm. The shear response
was subsequently obtained through observation from strain gauges positioned at three
essential locations. The bond constitutive model was developed by superimposing data
collected from flexural testing of CFRP sheets with the steel elements to ensure that
failure was not mandated by the failure of the strengthened material. The model was
calibrated to the experimental test results of identical beams. Model calibration was
conducted using a Multicriteria Sensitivity Analysis (ASM) method based on three
Quantity of Interest (QoI) parameters, namely ultimate load, energy, and toughness.
The application of an adopted bond material model, derived from flexural-shear
bond behavior and supported by ASM, demonstrated the accuracy of the RBSM for
concrete-CFRP beams (BF-RBSM). Validation with experimental data showed that the
RBSM model achieved over 90% accuracy in predicting load-displacement behavior and
the consistency of beam failure modes. The ASM implementation within the RBSM model
identified the concrete's ultimate tensile stress (Ft) as the most influential material
parameter affecting the performance of both the concrete-CFRP beams (BF) and the
control beams (BK). This ASM method proved to be effective, with a deviation of less than
10% in predicting key performance criteria, including ultimate load (Pu), energy
dissipation (Eu), and structural toughness (Tg).
Keywords : bond material model, concrete-CFRP, RBSM, ASM

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