Hybrid wood-polymer composites in civil engineering

Ponomarev, A.N.; Rassokhin, Aleksandr

doi:10.5862/mce.68.5

Cited by 19 publications

(17 citation statements)

References 3 publications

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“…It is known that in the area of the attenuated creep under the long-lasting static load, the structure acquires a stress-strain state after a certain time, which remains almost unchanged in the time following. In this regard, the mentioned formulas can be simplified by substituting variable operators for еру influence coefficients reflecting the steady stressstrain state [20][21][22][23][24][25][26].…”

Section: Resultsmentioning

confidence: 99%

The phenomenon for the wood creep in the reinforced glued wooden structures

et al. 2018

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For the composite structures based on wood, that include reinforced wooden structures, allowance for the influence of wood specific features as a building material allows us to evaluate its structural design as accurately as possible and ensure the required reliability and durability. Creep that causes wood deformations evolving in time can be referred to the specific properties of wood to a greater extent affecting the operation of the reinforced wooden structures. Taking into account the state of the issue to determine the effect of the long-acting loads on the stress-strain state of the reinforced glued wooden structures, the article considers the application of the theory of elastic heredity as the most applicable to assess the deformability of wooden structures in time. The conducted experimental and theoretical investigations and the reinforced glued wooden structures observations during the operational process have shown that their stress-strain state changes significantly under the load over time. Glue compositions used to connect reinforcement with wood ensure their reliable joint operation, however, as the result of the wood creep where wood is the basic material, the redistribution of forces between the reinforcement and wood occurs there on and off. At the same time normal stresses in the reinforcement and the glue joint “reinforcement - wood” increase in the calculated cross sections while they decrease in the wood, which is caused by a change (decrease) in the wood elastic modulus. Allowance for the wood creep in the design of the reinforced wooden structures will allow to determine the stress - strain state of the structure in the design more precisely. Therefore, when developing the reinforced wooden structures design standards, this factor must be taken into account.

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Section: Resultsmentioning

confidence: 99%

The phenomenon for the wood creep in the reinforced glued wooden structures

et al. 2018

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“…Disposal of waste materials from different types of industry has become an actual problem. To solve this problem, two generalized routes come to mind: firstly, to reuse the disposed materials as received in some suitable applications, and secondly to recycle the waste in order to obtain a new material that may again find application in the parent or in another industry [1][2][3][4]. For instance, waste polyethylene terephthalate (PET) plastic is neither environmentally biodegradable nor compostable, which creates disposal problems.…”

Section: Introductionmentioning

confidence: 99%

Composite material based on the polyethylene terephthalate polymer and modified fly ash filler

Zaichenko

Nefedov

2018

MATEC Web Conf.

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The possibility of filling the recycled polyethylene terephthalate (rPET) with fly ash was studied to make a polymer composite material (PCM). It is shown that high adhesion between polymeric matrix and mineral filler is the key parameter to produce high performance PCM. For this purpose the acid-basic interaction as well as the thermodynamic work of adhesion between components of PCM were calculated. The technique of modifying fly ash filler with 5% concentration solution of sulfuric acid to increase acid-basic interaction has been elaborated. The resulting behavioral patterns are listed and compared to those of composites containing untreated fly ash particles.

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“…In the paper [3], strength and wood elasticity of composite beams with a wall from an oriented structural board are considered. In the studies performed [4][5][6][7][8][9][10][11][12][13][14][15][16][17], the issues of influence of anisotropy of the wood properties and various methods of fastening and strengthening on the stressstrain state of the structure have been considered.…”

Section: Introductionmentioning

confidence: 99%

Wooden I-Beams Made of Round Timber with a Core Rot

Byzov¹

2018

AJCBM

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Round timber with core rot was not used in the production of sawn timber for load-bearing building structures.The purpose of this work is the researches of a possibility of receiving wooden beams from round timber with a core rot. The wooden I-beam made of angular elements of the received their round forest products with decay was chosen as the object being studied. The design scheme for determining strength and deflections of the beam is a statically determinate hinged beam, loaded with a uniformly distributed load. The design spacing of the structure is assumed to be 6 meters. Under the action of a load equal to 1.5 kN/m, the beam is exposed to stress-strain state of transverse bending. A method for manufacturing I-beams from corner elements obtained as a result of cutting round logs with core rot is proposed. It has established that the calculated strength characteristics of I-beams produced according to the proposed technology may resist operational loads. Rated and tangential stresses arising from application of loads do not exceed the permissible values. Deflection of a beam does not exceed allowable deflection values. The use of round timber with core rot increases resources of wood for construction.

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Hybrid wood-polymer composites in civil engineering

Cited by 19 publications

References 3 publications

The phenomenon for the wood creep in the reinforced glued wooden structures

The phenomenon for the wood creep in the reinforced glued wooden structures

Composite material based on the polyethylene terephthalate polymer and modified fly ash filler

Wooden I-Beams Made of Round Timber with a Core Rot

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