An experimental and numerical study of low-cost fiber reinforced elastomeric bearing (FREB) using recycled rubber for seismic base isolation application

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ID: 285094
2025
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Abstract
This research proposed the development of the low-cost fiber-reinforced elastomeric bearing (FREB) utilizing recycled butyl rubber (IIR) from used inner tubes. Firstly, the study examines the hardness and tensile strength of recycled butyl rubber through a hardness test and the uniaxial tensile test, respectively. The hardness test results are 52.5, 57.5, 50.5, 53.0, and 54 IRHD for specimens 1, 2, 3, 4, and 5 respectively. The tensile strength of the five samples is 8.5, 9.7, 9.6, 8.5, and 8.3 MPa respectively. The dumbbell specimen was analyzed using ANSYS commercial software to compare the experimental and numerical results. In this study, the Ogden 1st order model was suitable to utilize in the determination of the hyper-elastic material constants of recycled rubber. These material constants are applied in the modeling of the proposed low-cost FREB in FEA to define the hyper-elastic material. Secondly, the mechanical properties of FREB were evaluated through a compression test and a combined compression and shear test. After conducting the compression test, the observed maximum vertical load-carrying capacity was 1862 kN, and the compressive strength measured 23.85 MPa. Then, the evaluated compression modulus and vertical stiffness of the FREB were 31.81 kN/mm², and 16624.63 N/mm, respectively. The load-carrying capacity of the proposed FREB, 23.85 MPa is comparable with those of commercially available elastomeric bearings. These values indicate the material's significant strength and rigidity under vertical loading conditions, confirming its suitability for applications requiring high load-bearing capacity. After the compression test, the deformations observed in the materials are decoupling of the fiber and rubber and also fiber reinforcement failure. Through the horizontal test, the FREB displays quite stable hysteresis loops at each level of displacement amplitude. Using the force-displacement curve, the horizontal stiffness of the FREB was 0.636 kN/mm at a shear strain of 33% and 0.5013 kN/mm at a shear strain of 53%, respectively. Moreover, the shear modulus of the proposed FREB was 1.2 MPa at 33% shear strain and 0.95 MPa at 53% shear strain, respectively. The horizontal stiffness and shear modulus decreased while the displacement amplitudes increased. Subsequently, the calculated damping ratio was 14.8% and 16.9% at the 33% shear strain and 53% shear strain, respectively. The damping ratio increased from 14.8% to 16.9% due to the enlargement of the hysteresis loop area. The damping capacity of the bearing is inversely proportional to horizontal displacements. The mechanical properties of the proposed FREB are comparable with those
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Authors Thin, Khin Than
Journal Malay Journal
Year 2025
DOI
DOI not found
URL
https://animorepository.dlsu.edu.ph/etdd_civ/10
Keywords Keywords not found

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