Slenderness Ratio Effect on Eccentric Compression Properties of Parallel Bamboo Strand Lumber Columns

Self Cite

In order to investigate the influence of length and compression directions upon behaviour of parallel bamboo strand lumber (PBSL) specimens, 240 axial compression tests have been performed. With three similar one different typical failure modes, the mechanical performance for PBSL specimens under compression parallel to grain and perpendicular to grain are different as a whole. From the point of the characteristic values, the compression strength parallel to grain is 2.1 times of the compression strength perpendicular to grain. The elastic modulus for compression parallel to grain is 3.64 times of the compression strength perpendicular to grain. While the compression ratios along two compression directions are equal to each other. The bigger Poisson ratios for one typical side surface is 3.93 times of that for another typical side surface for PBSL specimens under compression perpendicular to grain, and the bigger value is equal to that for PBSL specimens under compression parallel to grain. Length can influence the mechanical properties of the PBSL specimens. The size 50 mm × 50 mm × 100 mm should be good choice for the standard or code to measure the compression strength. PBSL materials have better ductility under compression parallel to grain than that under compression perpendicular to grain. Stress-strain relationship models were proposed for PBSL specimens under compression parallel to grain and perpendicular to grain, respectively. These proposed models gave a good agreement with the test results.

Section: Introductionmentioning

confidence: 99%

“…Yu et al [30][31] have carried out the experiments about the preparation, physical, mechanical, and interfacial morphological properties of PBSL. Considering some influencing factors, the mechanical performance for PBSL columns [16][17] and beams [32][33][34] were also investigated by the researchers.…”

Section: Introductionmentioning

confidence: 99%

Compression Behaviors of Parallel Bamboo Strand Lumber Under Static Loading

Li¹,

Qiu²,

Wu³

et al. 2019

Self Cite

“…The bamboo is a natural biomass composite material that can be regenerated after being cut and can be degraded after being discarded. Bamboo not only has a fast growing rate, being ready for harvest in 3-5 years, but also has a high strength-to-weight ratio, compared with other traditional buildings such as steel and concrete [3,4]. However, the use of natural bamboo as construction material is limited mainly because of small diameter, hollow wall and easy to crack.…”

Section: Introductionmentioning

confidence: 99%

Flexural Performance of CFRP-Bamboo Scrimber Composite Beams

Wu¹,

Huang²,

Li³

2019

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.

“…RS strength and stiffness in CLT have been identified as key factors that can affect the design and performance of CLT floor systems [1]. To address these concerns, numerous studies have been conducted, including the measurement and prediction of the RS properties of CLT, enhancement of the RS properties of CLT, as well as the evaluation of test set-up configuration and methods [3][4][5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Out-of-Plane Shear Properties of Cross-Laminated Timber

Yang¹,

Cao²,

Wang³

et al. 2019

The out-of-plane shear properties of cross-laminated timber (CLT) substantially influence the overall mechanical properties of CLT. Various testing methods and theories related to these properties have recently been developed. The effects of the number of layers (three and five layers) and testing method (shortspan three-and four-point bending tests) on the out-of-plane shear properties of CLT were evaluated. The out-of-plane shear strength values were calculated based on different theories for comparison. The failure mode in the short-span four-point bending (FPB) method was mainly the rolling shear (RS) failure in the cross layers, indicating that the FPB method was appropriate to evaluate the RS strength of CLT. The out-of-plane shear capacity obtained using the three-point bending (TPB) method was higher than that tested by the FPB method. The testing methods significantly influenced the out-of-plane shear capacity of the three-layer specimens but not that of the five-layer specimens. With an increase in the number of layers, the out-of-plane shear strength of the specimens decreased by 24%. A linear correlation was found among the shear strength values obtained from different theories.