Ductility of the Tensile Zone in Bent Wooden Beams Strengthened with CFRP Materials

Wdowiak-Postulak, Agnieszka; Brol, Janusz

doi:10.3390/ma13235451

Cited by 13 publications

(10 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the case of new, currently designed structures, we may observe a trend towards the construction of composite structures, utilising properties of various materials, e.g., through reinforcement in the tensile zone of wooden beams produced from inferior quality timber [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 ]. Among other things, these measures aim at the optimisation of their cross-sections and increased use of inferior quality materials, in this case timber; additionally, such elements are relatively easy to manufacture.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Strength Properties of Structural Glulam Elements from Pine (Pinus sylvestris L.) Timber Reinforced in the Tensile Zone with Steel and Basalt Rods

et al. 2021

View full text Add to dashboard Cite

The study analyzed potential applicability for asymmetric reinforcement of glulam beams using materials with a higher modulus of elasticity. Reinforcement elements included smooth and ribbed steel rods as well as basalt rods. These rods were placed only in the tensile zone, assuming that they will not only impart increased rigidity but first of all will reduce the scatter of bending strength values. What is significant, tests were conducted on timber with defects, as it is most commonly used in industrial practice. Analyses showed that this provides an increase in rigidity close to the assumed level. A significant increase in strength was observed. The manufactured beams reinforced with steel and basalt rods were characterized by mean bending strength amounting to 54 and 47 N/mm2, respectively. However, no significant improvement was found in the scatter of the observed variable. Beams reinforced with steel exhibit a 20% higher strength than unreinforced beams. The lower strength of beams reinforced with basalt bars may be related to the lower modulus of elasticity of the basalt itself.

show abstract

Section: Introductionmentioning

confidence: 99%

“…Wdowiak-Postulak and Brol [ 4 ] tested beams manufactured from glued pine timber type c (combined), of which each was composed of four lamellas. Bending reinforcement CFRP tapes were glued to the bottom face of the beam or between the two bottom lamellas.…”

Section: Introductionmentioning

confidence: 99%

Strength Properties of Structural Glulam Elements from Pine (Pinus sylvestris L.) Timber Reinforced in the Tensile Zone with Steel and Basalt Rods

et al. 2021

View full text Add to dashboard Cite

show abstract

“…It became possible, thanks to the introduction of transparent and simplified design procedure rules, to use tapes for this type of construction [ 1 , 2 ]. Currently, there are an increasing number of studies describing research on the use of CFRP tapes to strengthen timber structures [ 3 , 4 ], and even cast iron structural elements [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Mechanical Properties of Steel and CFRP Tapes on the Effectiveness of Strengthening Thin-Walled Beams

2021

View full text Add to dashboard Cite

The paper presents a comparison of the effectiveness of strengthening steel thin-walled, cold-formed sigma beams with CFRP tapes and steel tapes. For this purpose, three beams without reinforcement (reference beams) of the “Blachy Pruszyński” type, with a cross-section of ∑200 × 70 × 2 and a span of 280 cm, made of S350GD steel grade, were subjected to laboratory tests in the four-point bending scheme. In the next stage the tests included nine ∑200 × 70 × 2 beams reinforced with Sika CarboDur S512 CFRP tape and six ∑200 × 70 × 2 beams reinforced with steel tape made of S235 steel grade. The length of the reinforcement tapes as well made of steel as well of CFRP was of 175 cm. The location of the tapes within the height of the beams’ cross-section was assumed in three variants, namely placing the tape on the upper or bottom flange and on the web. In the case of beams reinforced with CFRP, three beams were tested for each reinforcement location, and in the case of beams reinforced with steel tapes, two beams were tested for each reinforcement location. SikaDur®-30 glue with a thickness of 1.3 mm was used in order to connect steel or CFRP tapes to the beams. The dimensions of the tapes cross-sections in both cases were similar (CFRP tapes: 50 × 1.2 mm, steel tapes: 50 × 1.3 mm). For all types of beams, numerical models were also developed in the Abaqus software. The main aim of this paper was investigation of the influence of mechanical properties of steel or CFRP tapes on the effectiveness of strengthening ∑ beams. For this purpose a comparison of these two solutions with respect to the limitation of displacements and deformations of the beam was performed. The obtained results were considered in the context of the mechanical properties of the materials composing the reinforcement tapes. The tests showed slight differences in the results of strain and displacements obtained for reinforcement made of two different materials. It was also noted that the decisive element was the failure of the joint at the steel-glue interface. Therefore, future studies will pay particular attention to the adhesive layer.

show abstract

“…Haojuni researchers et al [29] found that FRP reinforcements improve the mechanical properties of reinforced wooden elements. Many other research works on FRP reinforced beams were also carried out, taking into account also the structural and geometric features of construction timber [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45]. In the studies [46][47][48], the obtained increase in the load-bearing capacity of reinforced beams depended mainly on the type of the reinforced element or fiber, the reinforcement layout, the degree of FRP reinforcement and the cohesion of the bonding surface between FRP and wood.…”

Section: Introductionmentioning

confidence: 99%

Behavior of Glulam Beams Strengthened in bending with BFRP Fabrics

Wdowiak-Postulak

Świt

2021

Civil and Environmental Engineering Reports

Self Cite

View full text Add to dashboard Cite

The article presents results of an experimental studies on reinforcement of pine beams made from glued laminated timber with subsurface basalt fibers (BFRP). An experimental research program was presented, in which the bending strength of glued laminated timber of middle and lower quality class was increased after using BFRP basalt fabrics. Thanks to the use of BFRP reinforcement, an average load capacity increased by 47% and stiffness by 6% in comparison to non-reinforced elements. Based on the research, it was found that the use of BFRP basalt fabrics is an effective method for strengthening damaged wooden elements. Thus, it is an environmentally friendly method of improving the static work of structural elements by combining wood with other natural materials such as basalt fiber reinforced polymers.

show abstract

Ductility of the Tensile Zone in Bent Wooden Beams Strengthened with CFRP Materials

Cited by 13 publications

References 21 publications

Strength Properties of Structural Glulam Elements from Pine (Pinus sylvestris L.) Timber Reinforced in the Tensile Zone with Steel and Basalt Rods

Strength Properties of Structural Glulam Elements from Pine (Pinus sylvestris L.) Timber Reinforced in the Tensile Zone with Steel and Basalt Rods

Influence of Mechanical Properties of Steel and CFRP Tapes on the Effectiveness of Strengthening Thin-Walled Beams

Behavior of Glulam Beams Strengthened in bending with BFRP Fabrics

Contact Info

Product

Resources

About