The effect of eccentricity on the strength characteristics of glued rods made of steel cable reinforcement in solid wood

Koshcheev, A. A.; Roshchina, Svetlana; Naichuk, A. Y.; Vatin, Nikolai Ivanovich

doi:10.1088/1757-899x/896/1/012059

Cited by 18 publications

(2 citation statements)

References 32 publications

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“…Each side of the roof truss was provided with internal and external node plates, each with a diameter of 20 mm large hexagonal head high-strength bolts 64 and a hole diameter of 22 mm. The bolt strength class was 10.9 S, and the bolt pretension ranged from 155-187 kN, the value of which was specified in Appendix B of the GB50205-2020 Steel Structure Engineering Construction Quality Acceptance Standard [31]. Here, the force of each member of the node was transferred through welded connections, such as the flange plate and bottom plate, and friction was provided by friction-type high-strength bolts [5].…”

Section: Fe Modellingmentioning

confidence: 99%

Application and Practice of Variable Axial Force Cable in Powerhouse Truss Reinforcement System

Shen

Hong

et al. 2023

Buildings

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Long-span steel structure trusses are widely used in factory buildings. However, with the increase in service time and dynamic load fatigue, transverse cracks at the bottom of the middle span and oblique deformation of the abdomen during the operation process may appear in a considerable part of long-span trusses with dynamic load. The U-shaped cracks at the bottom and belly, as well as the mid-span down deflection of the main truss, can also reduce the functionality of the factory building truss structure and limit the original crane load, thus affecting the normal safety and durability of the structure. Therefore, the principle of variable axial force cable system in the long-span factory building truss structure and 3D3S software modelling were applied. Analysing and studying the reinforcement method of large-span powerhouse trusses can provide practical experience for subsequent similar projects. In view of the above phenomenon, the large-span powerhouse trusses of Hongcheng Powerhouse No. 1 and No. 2, located in Tonglu, Zhejiang Province, were used as the research objects, and the variable axial force cable method was proposed to strengthen and lift the load. Considering the span of the powerhouse truss, a cable system with 22 m and a controlling force of 400 kN was proposed for Powerhouse 1, and a cable system with a variable axial force of 24 m was proposed for Powerhouse 2. The force model of large-span trusses was established by using the finite element method, which is commonly used to analyse the force of the truss. The influence of the reinforcement effect was analysed under two working conditions and compared from three aspects: stiffness, bearing capacity and stability. Furthermore, the phenomenon of uneven stress distribution was analysed. The stress distribution characteristics of each node were understood by simulating the most disadvantageous node plates with the greatest internal force before and after reinforcement.

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Section: Fe Modellingmentioning

confidence: 99%

Application and Practice of Variable Axial Force Cable in Powerhouse Truss Reinforcement System

Shen

Hong

et al. 2023

Buildings

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“…В работах [1,[13][14][15] рассмотрены режимы разрушений деревянных конструкций. используют различные способы их восстановления и усиления [8,20,21,23,24,27]. известны комплексные исследования по практическому применению полимерных композиций при восстановлении деревянных конструкций [4,6,25,37].…”

Section: Introductionunclassified

Numerical Study of the Stress-Strain State of a Modified Wooden Beam

Chibrikin¹,

Lukin²,

Lukina³

et al. 2022

Lesnoy Zhurnal (Forestry Journal)

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Preservation of wooden architecture monuments requires special attention since during their operation for 100 years and more wooden structures are exposed to environmental influences resulting in weakening their bearing capacity. The use of external reinforcement systems for buildings of historical value leads to a loss of architectural look. The proposed method of restoring the bearing capacity of the destructed wooden beams in the support zones is based on modification with a polymer composition. We have considered 3 types of pine beams: destructed, modified in the support zones; wooden, weakened by destruction; “healthy”. Numerical calculation of beams with a length of 6 m and a cross-section of 100×200 mm is performed in the Lira software package. The calculation model of the beams considered was created by adapting the initial data for the working environment of the software package used. The computational model is set as a three-dimensional body obtained by triangulation and “extrusion” of beam projection section. Shear stresses in the supporting zone, as well as vertical movements of the beams have been determined according to the developed method of calculation of wooden beams. The parameters of the modified beam and the reference “healthy” structure were compared. Shear stresses in the strengthened beam are 15–17 % higher than in the “healthy” beam. It was found that the strength of the destructed beam modified on supports increased by 16–18 % compared to the destructed beam. The boundary conditions for the modification of destructed wooden beams in the support zones to restore their bearing capacity have been determined on the basis of the obtained results. If the loss of bearing capacity is more than 35 %, then this method is not recommended due to the expediency of replacing such structures.

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