Prestressed glulam timbers reinforced with steel bars

Luca, V. De; Marano, Cosimo

doi:10.1016/j.conbuildmat.2011.11.016

Cited by 88 publications

(54 citation statements)

References 9 publications

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“…There were various strengthening techniques in previous studies for wood and bamboo structure. For instance, Luca et al [11] investigated the flexural behavior of reinforced and reinforced-prestressed glue laminated timber beams with steel bars. The experimental results demonstrated that flexural strength can be improved by strengthening beams with simple or prestressed steel bars.…”

Section: Introductionmentioning

confidence: 99%

Flexural Performance of CFRP-Bamboo Scrimber Composite Beams

Wu¹,

Huang²,

Li³

2019

Journal of Renewable Materials

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This study presents a new structure made up of bamboo scrimber and carbon fiber reinforced polymer (CFRP) to address the low stiffness and strength of bamboo scrimbers. Three-point bending test and finite element model were conducted to study the failure mode, strain-displacement relationship, load-displacement relationship and relationships between strain distribution, contact pressure and deflection, and adhesive debonding. The results indicated that the flexural modulus and static flexural strength of the composite beams were effectively increased thanks to the CFRP sheets. The flexural modulus of the composite specimens were 2.33-2.94 times that of bamboo scrimber beams, and the flexural strength were 1.49-1.58 times that of bamboo scrimber beams. Adhesive debonding had a great influence on the strain distribution and deflection of the composite specimens. It was an important factor for the failure of the CFRP-bamboo scrimber composite specimens. According to the finite element simulation, the strain distribution, contact pressure and deflection also greatly changed with the adhesive debonding. After complete peeling, the deflection of the specimen was 3.09 times that of the unpeeled because it was no longer an integral beam.

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Section: Introductionmentioning

confidence: 99%

Flexural Performance of CFRP-Bamboo Scrimber Composite Beams

Wu¹,

Huang²,

Li³

2019

Journal of Renewable Materials

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“…As revealed by many existing investigations on the exural performance of the bamboo beams, the failure modes of the bamboo beam are mainly featured as the fracture of tensile bamboo bers and the excessive mid-span de ection under exural loads. erefore, to improve the practical utilization of the bamboo engineering material, the strengthening techniques [21][22][23][24] are recommended and of important necessity. In the previous studies of wood structures, strengthening techniques include prestressed steel bar [21], carbon berreinforced polymer (CFPR) sheet [25], glass ber-reinforced polymer (GFRP) sheet [26] and CFRP bar [27], etc.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Nonprestressed/Prestressed BFRP Bar on Flexural Performance of the Bamboo Beam

Ding

Liu

2019

Advances in Polymer Technology

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Until now, the systematical and comprehensive strengthening techniques have not been formed for the bamboo structure. Under such background, this paper aims to explore the e ects of the application of the nonprestressed and prestressed basalt ber-reinforced polymer (BFRP) bars on the exural performance of the beams made of the laminated bamboo and reconstituted bamboo materials. Two series of four-point bending tests were thus conducted. In the rst series of tests, the pure laminated bamboo beam and the laminated bamboo beam applied with nonprestressed BFRP bar were compared. Test results showed that the ultimate load and deformation capacity of the laminated bamboo beam was improved due to the existence of the BFRP bar. In the second series of tests, the reconstituted bamboo beams applied with nonprestressed and prestressed BFRP bars were compared. It is found that the ultimate load of the reconstituted bamboo beam was not improved by the application of the prestressed force. e further analysis related to the prestress loss demonstrated that the prestress loss before the release of the prestressed BFRP bar could reach up to 31.8-37.3% compared with the design initial prestressed stress. e prestress loss caused by the elastic deformation of the bamboo beam can be neglected. For all tested specimens, the plane section assumption was acceptable and the position of the neutral axis of the beam gradually moved down with the increase of the applied load.

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“…An adequate mechanical description of timber material is an important task in scientific research on structural analysis of timber building. Also, an accurate stress analysis is particularly necessary for a composite system such as reinforced timber or pre-stressed timber, for the coupling and interaction of adhesive, lamination and reinforcements [1], and also for components used in connection joint [2].…”

Section: Introductionmentioning

confidence: 99%

A Finite Element Method Model for Large Strains Analysis of Timber

Luca¹

2017

Wood in Civil Engineering

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In this report a Finite Element Method (FEM) model, within the continuum mechanics of\ud solids, for mechanical long term response of timber structures is presented. The proposed\ud model can analyze three-dimensional solids, within the theory for non-linear\ud material orthotropic elastic-viscous-plastic. It can account ductile behaviour in compression\ud and brittle behaviour in tension, under the kinematics hypothesis of large displacements\ud and large strains. The work has been carried out with a general purpose FEM\ud software code in which a specific stress-strain law for wood, by a proper subroutine, has\ud been built in. The constitutive equations have been formulated by a multi-surface yield\ud approach of viscoplasticity, each yield surface acts separately each other. This approach\ud is specifically almost necessary for some problems, such as glued composite parts or\ud steel bolt connections. Specialized solution algorithms, which adopt time-stepping and\ud automating relaxation techniques, have been used to handle the behaviour of the loading\ud path response for elastic-viscous-plastic or elastic-brittle behaviours. The model has\ud been applied to examples to test the effectiveness of the suggested approach. The results\ud obtained have shown the potentiality of the proposed model to effectively simulate the\ud overall mechanical behaviour of timber

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Prestressed glulam timbers reinforced with steel bars

Cited by 88 publications

References 9 publications

Flexural Performance of CFRP-Bamboo Scrimber Composite Beams

Flexural Performance of CFRP-Bamboo Scrimber Composite Beams

Effect of the Nonprestressed/Prestressed BFRP Bar on Flexural Performance of the Bamboo Beam

A Finite Element Method Model for Large Strains Analysis of Timber

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