Flexural behaviour of glulam bamboo beams reinforced with near-surface mounted steel bars

Wei, Yang; Zhou, Mengqian; Chen, D. J.

doi:10.1179/1432891715z.0000000001377

Cited by 30 publications

(18 citation statements)

References 11 publications

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“…The bamboo scrimber beams (Specimen 0-1 ~ 0-3) were hot pressed for one time, and other beams were reheated and cured with the bamboo scrimber sheets and CFRP sheets. The process of making CFRP-bamboo scrimber composite (CBSC) beams was as follows: (1) Preparation of the bamboo scrimber sheets: pass natural bamboo tubes through a rolling machine along the grain direction, flatten along the longitudinal fiber direction to obtain the oriented bamboo bundle, use steam to heat them at 130°C for 140 min, immerse them in resin for about 10-15 min at room temperature, dry for 8 h at room temperature, make them into plates using a hot pressing machine, and then saw them into required sizes [9,10,15]. (2) Preparation of CFRP sheets: cut the prepreg CFRP into required sizes, bond them into sheets for the required thickness, and cure them in an incubator for 90 min at 120°C.…”

Section: Specimen Preparationmentioning

confidence: 99%

“…The results indicated a significant increase in the flexural strength and stiffness of FRP-wood composite beams. Wei et al presented a bamboo structure that was reinforced with bars [14][15][16]. The application of bars in the tensile regions of bamboo beams significantly increased the load-carrying capacity and section stiffness and improved the utilization of the compression plastic behavior of bamboo.…”

Section: Introductionmentioning

confidence: 99%

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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: Specimen Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flexural Performance of CFRP-Bamboo Scrimber Composite Beams

Wu¹,

Huang²,

Li³

2019

Journal of Renewable Materials

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“…ere are still many disadvantages of wood including a long growth, slow regeneration, a significant shortage, and a low utilization rate of the raw materials [8,9]. erefore, it is necessary to explore more feasible and appropriate materials based on sustainable requirements, and the bamboo is attracting researchers' attention.…”

Section: Introductionmentioning

confidence: 99%

“…erefore, it is necessary to explore more feasible and appropriate materials based on sustainable requirements, and the bamboo is attracting researchers' attention. Compared with wood, advantages of the bamboo are demonstrated as follows: (1) faster growth speed, (2) high specific strength, (3) high specific rigidity, and (4) lower water swelling ratio [8][9][10]. e bamboo is convenient to be locally obtained in China, which has characteristics as saving costs, environmental friendliness, and recyclability [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Flexural Performance of Cross‐Laminated Bamboo (CLB) Slabs and CFRP Grid Composite CLB Slabs

Wang

Liu

2019

Advances in Civil Engineering

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In order to accord well with the requirements of sustainable development and green construction, a cross-laminated bamboo composed of an odd number of orthogonally oriented layers of bamboo scrimber is proposed in this paper. Adjacent bamboo layers are face-bonded by structural adhesives under pressure. The uniform mechanical and physical properties can be obtained through the orthogonal layup. Flexural performances of three groups of one-way CLB slabs and two groups of one-way CLB slabs strengthened with CFRP grids were investigated via four-point monotonic loading configuration until failure. Experimental parameters of thickness of the layer, number of layers, and manufacturing processes of CFRP grids were taken into consideration. Experimental observations showed that the failure of the CLB slab was brittle, and different failure modes were found in the CLB slab with CFRP grids via different manufacturing processes. Test results showed that the load-carrying capacity increased with the thickness of the layer, number of layers, and application of CFRP grids pressed in the bamboo layer, but the CFRP grids pressed in the interface of adjacent bamboo layers weakened the load-carrying capacity. The strain analysis demonstrated that the compression region was utilized with more efficiency via CFRP grids pressed in the bamboo layer, and the plane cross section assumption is suitable for both CLB slab and CLB slab strengthened with CFRP grids. A theoretical calculation method of flexural load-carrying capacity was proposed for the CLB slab, the accuracy of which was proved.

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“…e technique offers many advantages over external bonding of bar reinforcement, for instance, increased bond capacity, due to a larger bonded surface area, and protection from external damage due to external impacts, since the bar is embedded within the concrete cover. Near surface mounted (NSM) screw-thread steels and CFRP bars are now emerging as a promising technique widely used for increasing flexural and shear strength of deficient RC members [1,2] and were extended to unreinforced masonry (URM) walls [3], timber beams [4], and glulam bamboo beams [5] for increasing shear and flexural capacity. e aforementioned research is aimed at the components; for the structures, reinforced concrete frames strengthened with NSM bars were investigated and pointed out that reinforced concrete frames strengthened with NSM bars have a higher ultimate strength.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Flexural Behavior of Granite Stone Slabs with Near Surface Mounted CFRP Bars and Screw‐Thread Steels

Gao

Chen

Ding

et al. 2018

Advances in Materials Science and Engineering

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An experimental study that investigates the behavior of stone slabs strengthened in fixure with near surface mounted (NSM) technique using screw-thread steels and carbon fiber-reinforced polymer (CFRP) bars is presented. A total of ten full-scale stone slabs were tested under a four-point bending loading to investigate the effect of groove dimension, reinforcement ratios, and reinforcement materials on the flexural performance of stone slabs. e test results included failure characteristics, yield and ultimate capacities, deflection of midspan, and cracking behavior of stone slabs. e test results indicate that with the increase of groove height and groove width, cracking load and middeflection decrease by 6.4%-14.18%; however, failure load and middeflection increase by 4.7%-41.2%. Cracking load, failure load, and failure displacement of stone slabs adopting NSM screwthread steels increased by 10.9%, 167%, and 617%, respectively, under the maximum reinforcement ratios of 0.629% over the control slab without NSM bars. Meanwhile, with the increase of reinforcement ratios, the failure mode transforms from brittle failure to ductile failure. e calculation results of strength are in agreement with the experimental results. Finally, it can be concluded that NSM CFRP bars are more effective than NSM screw-thread steels to improve flexural capacity with the same reinforcement ratios.

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Flexural behaviour of glulam bamboo beams reinforced with near-surface mounted steel bars

Cited by 30 publications

References 11 publications

Flexural Performance of CFRP-Bamboo Scrimber Composite Beams

Flexural Performance of CFRP-Bamboo Scrimber Composite Beams

Flexural Performance of Cross‐Laminated Bamboo (CLB) Slabs and CFRP Grid Composite CLB Slabs

Experimental Investigation on Flexural Behavior of Granite Stone Slabs with Near Surface Mounted CFRP Bars and Screw‐Thread Steels

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