Structural grading of Gigantochloa apus bamboo based on its flexural properties

Nurmadina,; Nugroho, Naresworo; Bahtiar, Effendi Tri

doi:10.1016/j.conbuildmat.2017.09.170

Cited by 46 publications

(30 citation statements)

References 20 publications

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“…Previous studies on the geometry of bamboo culms [14][15][16] have focused on studying its variability with the objective of establishing variational patterns from which conservative geometric estimates can be inferred. The applicability of these estimates as design parameters or as a grading system for bamboo poles [17,18] is relatively limited and can lead to overconservative guidelines due to the large geometric variability found across different species and even among a small sample of poles [19]. Other research [20,21] have focused on the study of the out-of-straightness of the pole's centroidal axis, designing methodologies to measure it and quantify its effect on their structural performance.…”

Section: Figure 1 Main Physical Features Of Bamboo Culmmentioning

confidence: 99%

Digitisation of bamboo culms for structural applications

Lorenzo

Mimendi

2020

Journal of Building Engineering

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Reducing the negative environmental impact caused by the intensive manufacturing of industrialised building materials and components requires the adoption of alternative sustainable resources and the development of appropriate procedures to encourage their use in the construction industry. Bamboo in its natural form (culms or poles) is one of the most promising nonconventional sustainable building materials, endemic to most developing countries where high demand for building materials will be driven by the large-scale urbanisation predicted for the coming decades. The use of bamboo poles as structural elements poses multiple challenges starting with the need to define their inherent geometric variability to enable their inclusion in formal design and fabrication processes. This paper describes the details of a non-destructive 3D scanning and modelling workflow developed to capture and process the relevant digital information that describes the geometric properties of bamboo poles. The digitisation of over 230 poles with a combined length of 500 m was carried out confirming the accuracy of the generated geometric models. Also, a small reciprocal frame prototype was successfully developed based on the geometric information extracted from a 3D model of the structure incorporating the digitised poles. The effective digitisation of bamboo poles and its integration into modern platforms can provide the construction industry with the necessary support to design, build and maintain high quality structures that incorporate this sustainable and renewable resource.

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Section: Figure 1 Main Physical Features Of Bamboo Culmmentioning

confidence: 99%

Digitisation of bamboo culms for structural applications

Lorenzo

Mimendi

2020

Journal of Building Engineering

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“…As such, it is case-specific, and cannot be used universally in structural design. To alleviate the uncertainties stemming from geometric variability, some studies propose structural grading [14,17], as basis for a capacity-based approach [14]. Regardless, there is a need to explain the gradual loss of stiffness that initiates before any apparent failures, and to identify the underlying universal failure mechanisms.…”

Section: Introductionmentioning

confidence: 99%

“…For example, ISO 22156:2021 [6] includes particular geometric specifications for bamboo culms, to prevent crushing and kinking in culms used in construction. Yet, experimental studies indicate that crushing and kinking are common failure modes [11,12,14,16,17]. Additionally, full-culm bamboo modulus of rupture (MOR) depends on culm diameter and density [16], further showcasing the complexity of bamboo culm flexure.…”

Section: Introductionmentioning

confidence: 99%

“…They also showed numerically that the loss of stiffness after the initial linear elastic stage is due to the cracks that open when the circumferential tensile strength is exceeded. Several experimental studies [11,14,16,17] used the Euler–Bernoulli beam theory to analyse bending of bamboo culms, thus examining solely longitudinal tension/compression failure.…”

Section: Introductionmentioning

confidence: 99%

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Insight into the behaviour of bamboo culms subjected to bending

Mouka

Dimitrakopoulos

Lorenzo

2022

J. R. Soc. Interface.

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This study describes analytically the behaviour of bamboo culms subjected to bending, and predicts the failure load and stiffness loss after the linear-elastic stage. Basis of the failure load prediction is the identification of the critical failure mechanisms. The study examines analytically four distinct failure mechanisms: Brazier instability, longitudinal tension/compression, tension perpendicular to the fibres and shear parallel to the fibres. It concludes that, for the three bamboo species examined (Moso, Guadua and Kao Jue), critical failure mechanisms are tension perpendicular to the fibres (with potential tension–shear interaction) and longitudinal compression. Which of the two mechanisms occurs first depends on the case-specific material properties and culm radius-to-thickness ratio. Regarding stiffness loss, the main cause is longitudinal splitting. The extent of the stiffness loss depends on crack length, crack number and crack location along the culm circumference. Secondary causes are nonlinear geometric effects at the large deflection stage. Assuming a parabolic deformed shape, a single equation can describe the stiffness loss induced by nonlinear geometric effects, regardless of material properties and culm geometry. Comparing the analytical results with pertinent experimental data, the proposed equations are sufficiently accurate in their prediction of failure load and stiffness loss, although they tend to underestimate both.

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“…For bamboo culm, Trujillo et al [13] indicated that grading could be utilized based on physical properties and flexural stiffness. Nurmadina et al [14] and Bahtiar [15,16] studied several potentials, including Mc, density, and linear mass, for bamboo culm both in flexural and compressive strength grading. e grading of timber and bamboo are constantly studied, but the strength grading of EBC subject to compressive properties is still missed.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Strength Grading of Engineered Bamboo Composites in China

Tang

Zhou

2021

Advances in Civil Engineering

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Engineered bamboo composite (EBC) is a new high-strength anisotropic structural material, which has standardized sections and less inherent variability than the natural material. For safety reasons in structural applications, the characteristic values of mechanical behaviors are needed to build the design values utilized in practical application. Recent research studies on EBC focused on the mechanical properties from a single source, with little research on the sampling of the manufacturers. The present work investigates mechanical properties of two types of commercially available EBC—parallel strand bamboo (PSB) and laminated veneer bamboo (LVB). The main aim of this work is to evaluate the best probability distribution model (normal, lognormal, and Weibull) and mechanical properties for EBC in China and determine the characteristic values indicated by ASTM D2915. The mechanical properties in tensile, compression, and shear were evaluated using about 4300 small clear specimens from seven manufacturers in five raw bamboo origins of China. Based on the confidence band method, the strength grading of EBC subjected to compressive strength was developed with two predictors (density and MOE). By using intervals of each predictor, several strength grades were built. Each grade has the mean compressive strength, 5th percentile lower value (R0.05), and characteristic value (Rk), which could be used in structural design. This research contributes to the establishment of EBC standards and is essential for further accepting these materials in structural engineering.

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Structural grading of Gigantochloa apus bamboo based on its flexural properties

Cited by 46 publications

References 20 publications

Digitisation of bamboo culms for structural applications

Digitisation of bamboo culms for structural applications

Insight into the behaviour of bamboo culms subjected to bending

Mechanical Properties and Strength Grading of Engineered Bamboo Composites in China

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