PSI - Issue 81

Mykola Pidgurskyi et al. / Procedia Structural Integrity 81 (2026) 539–546

543

Fig. 5. Finite element model of perforated beams with haunches: a) double-pitched beam; b) eaves joint of the arched beam; c) apex joint of the arched beam.

3. Research Results and Discussion 3.1. Deflection Analysis

According to national standards (DBN V.2.6-198:2014, 2014; DSTU B V.1.2-3:2006) and international standards (EN 1993 1-1:2006, Eurocode 3, 2005), serviceability limit states impose restrictions on the maximum deflection of steel roof beams. For a 24-m span, the permissible deflection is limited to 1/250 of the span, i.e. 96 mm. In this study, design load combinations were applied; however, even under these load values all beams exhibited deflections below the allowable limit and therefore satisfy the serviceability limit state requirements. The results of maximum deflections for all beam types with and without haunches are presented in Table 1, while the deflection distributions along the beam length are shown in Fig. 6.

Fig. 6. Deformed shapes of: a) horizontal beam; b) double-pitched beam; c) arched beam; d) deflection distribution along the beam length.

Table 1. Maximum deflection values for beams with and without haunches.

Horizontal

Double-pitched

Arched

Parameters

Without haunch

With haunch

Without haunch

With haunch

Without haunch

With haunch

Weight, kg

1459.3

1776.1 52.136

1471.8 33.577

1787.4 21.959

1472.5 29.394

1793.2 23.066

Deflection, mm 80.467