PSI - Issue 36

5

Gomon S. et al./ Structural Integrity Procedia 00 (2021) 000 – 000

Svyatoslav S. Gomon et al. / Procedia Structural Integrity 36 (2022) 217–222

221

100 110 120 130 140 150

0.2М max 0.4Mmax 0.6Mmax 0.8Mmax Mmax

0 10 20 30 40 50 60 70 80 90

Beam height, (mm)

u d ∙10

-4

-40 -30 -20 -10 0 10 20 30 40

Fig. 6. Distribution of deformations on section height in a zone of a pure bend of a beam GRB- 12В .

The compressed zone of the reinforced bending element from glued wood in the GRB-16B beam (Fig. 7) was strengthened even more than in the GRB- 12В due to an increase in diameter of reinforcing bars: the neutral line in cross-section of the GRB-16B beam under load rose even higher and was at a height of 78-83 mm. From Figs. 4-7 it is seen that with each procedure of improvement of the element at the maximum moment, the relative deformations in the farthest fiber from the neutral section line of the compressed area decreased from u d =43 · 10 -4 in the beam GB-A to u d = 36 · 10 -4 in the GRB-16B beam. The maximum bending moment is taken to be equal to the value (0.95-0.97) M from the fracture one.

100 110 120 130 140 150

0.2Mmax 0.4Mmax 0.6Mmax 0.8Mmax M мах

0 10 20 30 40 50 60 70 80 90

Beam height, (mm)

u d ∙10

-4

-50 -40 -30 -20 -10 0 10 20 30 40 50 60

Fig. 7. Distribution of deformations on section height in a zone of a pure bend of a beam GRB-16 В .

As can be seen from Table, the load-bearing capacity (strength) of normal sections in comparison with the least strong glued wood beam GB-B among studied reinforced beams has increased. Thus, for single reinforced beams with GRB-12C it increased by only 4%, while for beams with double combined reinforcement bearing capacity increased: for GRB-12A by 20%; for GRB-12B by 33%; for GRB-16A by 45%; for GRB-16B by 53%.