PSI - Issue 36

4

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

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

220

100 110 120 130 140 150

0.2Ммах 0.4Ммах 0.6Ммах 0.8Ммах Ммах

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

Fig. 4. Distribution of deformations on section height in a zone of a pure bend of a beam GB-A.

To prevent this process, it is logical to strengthen the compressed zone of the beams with a material with higher strength characteristics and a higher modulus of elasticity. Therefore, reinforcement of the compressed zone of board-glued beams with A500 reinforcing rods was used. On the other hand, as shown by the layered distribution of wood deformations and the location of the neutral line in the cross-section in the middle of the span of the GRB-12C beam at different loading modes (Fig. 5), these measures are not sufficient. Therefore, the GRB-12B beams and the GRB-16A beams were additionally reinforced with Sika CarboDur S-512 composite tape, which was glued to the outside of the stretched area.

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

Fig. 5. Distribution of deformations on section height in a zone of a pure bend of a beam GRB-12C.

Figure 6 shows the layer-by-layer distribution of wood deformations along the height of the calculated cross section and the location of the neutral line in the beam GRB-12B. From data in Fig. 6 it can be assumed that during the operation of such a combined reinforced beam at different load levels the neutral line will be above the main axis of the cross-section, at the level of 77-80 mm.