PSI - Issue 73

Přemysl Pařenica et al. / Procedia Structural Integrity 73 (2025) 125 – 129 Přemysl Pařenica and Petr Lehner / Structural Integrity Procedia 00 (2025) 000–000

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Fig. 4. Graphs of force-displacement diagram obtained from numerical models - span 5.0 m.

The results in the graphs show a significant effect of the reinforcing clip on the overall load carrying capacity of the detail of the high thin-walled purlins. The connection of the purlins using a bolted rack to clip with the web offset from the structure has a lower load capacity compared to the connection where the web is bolted to the structure. These results show that the effect of additional bolting of the web of tall thin-walled purlins in the connection detail to the structure has a positive effect on the overall load capacity. A percentual comparison of the load capacity of the different models is given in Table 1 and Table 2.

Table 1. Maximum load capacity results and comparison between models for a span of 3.1 m.

Model mark

Type of connections

Maximum force

Comparison to Model (A)

Model (a) Model (b) Model (c)

No clip

81.08 kN 135.65 kN 161.24 kN

100 % 167 % 199 %

Clip, purlins without bolt Clip, purlins with bolt

Table 2. Maximum load capacity results and comparison between models for a span of 5.0 m.

Model mark

Type of connections

Maximum force

Comparison to Model (A)

Model (a) Model (b) Model (c)

No clip

68.35 kN 88.18 kN 97.90 kN

100 % 129 % 143 %

Clip, purlins without bolt Clip, purlins with bolt

For a span of 3.1 m, the increase in load capacity for the model with clip but no attached purlin was approximately 67% compared to the model without clip, which is a significant value. The model with clip and attached purlins was a further 32% more load bearing, but as noted in earlier studies there is a problem with buckling and local buckling. For the 5.0 m span, the strength of model (b) shows a 29% increase over the baseline and model (c) shows a further improvement of about 14%. The overall values of the maximum forces achieved are smaller against the smaller span, which is expected in terms of force distribution. 4. Conclusions This study focused on numerical verification of different variants of high thin-walled purling connections, specifically on the effect of using a reinforcing clip and additional bolting of the purlin web to the supporting structure.