PSI - Issue 72

Denys Mykhailovskyi et al. / Procedia Structural Integrity 72 (2025) 315–322

318

Forces existing in a wooden bending element:

     0; ,

    wt M M M N N , wc , wc i

(2)

0.

, wt

On Fig. 3, a comparison of the wood, metal fittings, carbon fiber-reinforced, basalt fiber-reinforced, glass fiber reinforced deformation diagrams are shown. Such materials, as metal and carbon have a high MOE. So, metal and carbon reinforcement are the best reinforcement. Therefore, the main task of study was to develop a basis for calculating and modelling the work of structures reinforced with metal and carbon rods or tapes. At the same time, the elastic-plastic model of wood deformation, stresses and the features of the deformation of reinforcing materials should be consider for the calculation.

Fig. 3 Combined stress-deformation diagrams of various materials that can be used in reinforced glued beams

The internal forces should be taken into account in the stress-strain diagrams of wood. Then the equation can be written:

f u c wc c ,

1

  

u ( ) , w c

N b y wc ,

du

;

(3)

u

c

0

u

t

1

N b y f u    t wt , wt ,

wt ( ) ,

du

;

(4)

u

t

0

u

u

c

0 

2

w c ( ) ,

f

u du

M b y wc ,  

w c ,

;

(5)

wc ,

c

2

u

c