[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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Mechanics of wood and composites.

Tomasz Nowak – Cytowania w Google Scholar

Mielczarek, Budownictwo drewniane, Wydawnictwo Arkady, Warszawa, Eurokod 5 Projektowanie konstrukcji drewnianych. This paper uses ANSYS finite element program to do the nonlinear finite element analysis on steel reinforced concrete L-shaped short-shear walls.

Characteristic data of the employed carbon composites. This research has a great significance for controlling the fissure. The analysis of numerical calculations of the displacement confirms that the rigidity drewnine reinforced beams increases in comparison with the rigidity of the non-reinforced beams.

The results of numerical calculations of stress distributions are presented in Figures 7 and 8 as isolines of equivalent stresses. Determination of the extent to which the original cross-section of the component has been damaged during operation shallow or deep crack, shrinkage crack, damage of internal structure of the wood by insects and fungus, moisture allows to determine how much the strength properties of the wood component has been deteriorated.

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.

Their characteristic properties are budowwnictwo in Table 1 [9]. These materials are characterised by very good specific tensile strength ratio of the tensile strength to densityhigh elasticity modulus, deformation linearity practically up to destruction budownivtwo well as viscosity and resistance to chemical agents.

Therefore, it appears appropriate to carry nuhaus further experiments and investigations with the aim to determine the response of reinforced elements under long-term loads, taking into account the existence of different rheological properties of the structure of the component elements. Distribution of equivalent stresses at the 9 kN budownictwoo in the central cross sections of beams: 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].


Axis orientation of the adopted system budownictdo coordinates. Calculations of the geometric characteristics of cross sections of beams are presented in Table 2. This effect refers to the unification of mechanical properties in relation to wood defects, e.

In this way, it is possible to save good quality timber material and replace it by timber of poorer quality reinforced by modern composite materials.

Methods to Assess Load Capacity of the Old Wooden Building Components

Obliczenia statyczne i projektowanie [Timber structures. DR [mm 2 ]. Limiting the calculations to the linear elasticity and small displacements, the maximum deflections of the beam axis were expressed with the formula: The construction methods to control the fissure was proposed: Contemporary Problems in Architecture and Construction.

Sl, Budownictwo 93, [in Polish]. Advanced Materials Research Volume Application of concentrated forces of the beam model. Depending on the work conditions of construction the consumption manifest itself through: However, not all questions connected with the strength of the examined reinforced materials were answered. The different relative position between the two pre-existing flaws led to different levels of stress shielding effect under the axial force, and it is most likely to damage when the two pre-existing flaws are about overlap.

The elasticity constants for the domestic OSB board were adopted from literature data [1, 14, 15] and the appropriate standard — PN-EN Determination of strength properties of the component consist on establishing the type and kind of wood used in the construction and its class making it is possible to assign standardized permissible stress values and the modulus of elasticity. Sliding Joints from Traditional Asphalt Belts p. Distribution of reduced stresses in the composite. On the other hand, it was assumed that the shear strength of glue bonds was higher than the timber shear strength along fibres while maintaining the continuity of translocations at layer interfaces.


Based on the real construction technology, process and environment of Yuquanxi Bridge, the finite element method was applied in the research to make sure the crack mechanism and find out the impact of improper construction procedure on cracks of Block No.

Methods to Assess Load Capacity of the Old Wooden Building Components

However, these solutions have recently been facing some technological-practical as well as economical problems. The subsurface damage SSD generated in processing has great effect on the strength and performance of the substrates.

Table 3 presents results of deflections of all types of beam models in the central area both for analytical and numerical calculations. View of the solid model of the reinforced beam type ll S. After the discretisation, the beam model consisted of the following quantities of finite elements: The development process of cracks until the specimen damaged is enuhaus.

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The article depicted the methods of determining the rate of consumption of the construction and taking into account the effect of cracks, moisture, fungi and insects action on the load capacity of wooden components.

This number of finite elements resulted from the assumed quality parameters of generated mesh which were to minimise the possibility of the occurrence of peculiarities in the course of calculations. Identification of estimated points on the cross section. At last, the development process of crack distribution at different stages is studied.