[1]: H. Neuhaus H., Budownictwo drewniane, (Wood constructions), Polskie w ocenie postępu korozji biologicznej drewna i konstrukcji drewnianych, The. W tym celu przeprowadzono analizę nośności drewnianych stropów, która .. [5] Neuhaus H., Budownictwo drewniane, Polskie Wydawnictwo. Podstawowe zasady projektowania elementów konstrukcji drewnianych według W: Neuhaus, Helmuth: Budownictwo drewniane: podręcznik inżyniera.

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Though the uniaxial compression test of specimens with different rock bridge angleit can be found that rock bridge angle have a great impact on the mode of crack propagation of specimen. In numerical calculations, a permanent connection without slip between the component elements of the beam was assumed, i.

Because of their promising properties, intensive investigations have been carried out in recent years to study the utilisation of these materials to enhance the load-carrying capacity of different types of building structures, among others, by reinforcing certain elements made of steel, concrete or wooden structures.

Cross section area of the combined beam reduced to wood A equiv. Mielczarek, Budownictwo drewniane, Wydawnictwo Arkady, Warszawa, Calculations of the geometric characteristics of cross sections of beams budownuctwo presented in Table 2. Konstrukcje drewniane — Obliczenia statyczne i projektowanie.

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Theoretical calculations of the rigidity of the reinforced combined beams, taking into account material diversity of the composite, were carried out according to the classical elasticity theory referring to deformable materials [4, 10]. Distribution of reduced stresses in the composite.

The static-strength analysis aims to determine the actual strength of load capacity of the component and stability of the whole object after taking into account the adverse impact of consumption drewnianee damage of the construction and allows determining and selecting suitable variant of renovation, repair or enhance the construction of the object.


It is target for meuhaus working both in science and industry,regulatory agencies or teaching in agricultural sector. Obliczenia statyczne i projektowanie [Timber structures. Drewniwne addition, the investigations aimed to determine the values of stresses and deformations, primarily, in the zone of the connection of the composite and wood as well as in the jointing area of the OSB board, as the web of the I-beam, and wood flanges of the beam.

Therefore, it appears appropriate to carry out further experiments and investigations with the aim to determine the response of reinforced elements under long-term loads, taking into account drewniand existence of different rheological properties of the structure of the component elements.

In this way, it is possible to improve strength parameters without affecting significantly the dimensions or weight of the structure itself.

The performed simulation investigations, thanks to their abundant graphic part, create comfortable conditions for analyses using various types of loads, fixation, modification of mechanical properties of individual materials etc.

Application of concentrated forces of the beam model. From the analysis of stresses of beams subjected to bending it is evident that the highest shear stresses occur in the central part of the beam along the neutral bending axis which amounts to 3.

Van Nostrand Company, New York. Distribution of reduced stresses in the beam type — 0: Types of beams and way of loading: Mechanics of wood and composites. The formation mechanism was discussed; and a SSD model was presented.

I, II, [mm 2 ] Beam cross section reduced to timber A equiv. Application of concentrated forces of the beam model Figure 4 shows a perspective view of an exemplar model after its discretisation as well as the mutual contact of solid finite elements at the contact interface of materials.

Methods to Assess Load Capacity of the Old Wooden Building Components

The analysis of the form of deflections of individual models revealed, that the deflection line takes the form of a parabolic curve deflected more or less depending on the parameters of the carbon fibre. The obtained results were presented in the form of fields of combined states of stresses buodwnictwo deformations in individual beam elements.


By comparing the numerical results with actual cracks condition, the impact of improper construction procedure on cracks of Block No. During the discretisation process, model component elements were positioned in such a way that their axes agreed with the anatomical wood directions.

DR [mm 2 ] Equivalent moment of inertia J equiv. Characteristic data drewiane the employed carbon composites. However, the disadvantages of these materials include: The reinforcement effect was achieved by combining, with the assistance of the gluing technique, of a CFRP type carbon composite with wooden elements drewnians the beam.

Tomasz Nowak – Cytowania w Google Scholar

Maximum stresses occur in the pure bending zone and they reach the values close to the limiting normal stresses for timber the mean value for softwood along fibres amounts to about 90 MPa [4]. In this paper, the surface and subsurface damage caused by saw cutting, rough lapping and fine lapping of MgO substrates were studied by cross-section of microscopy and SEM.

It should be mentioned that, because the glue bond connecting the component elements of the construction was very thin, its impact was disregarded during the modelling process. I,II — axial moments of inertia of composite straps. Analysis of the strength and stiffness of timber beams reinforced with carbon fiber and glass fiber. Equivalent moment of inertia J equiv.

The type of the examined beams as well as the boundary conditions and loading type are presented in Figure 1.

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