8.4. Products 3: welded sections

Castellated beams IPE/HEA/HEB

Fig. 8.9 Non-residential buidlings. Castellated beams can be built by cutting a H or I section in one cut without loss of material. Round holes are also possible, but are less economical due to material losses and extra cutting.

Table 8.8 Dimensions of castellated beams.

Type	Size	\(h\) (mm)	\(b\) (mm)
IPE	180 - 600	270 - 900	91 - 220
HEA	180 - 1000	257 - 1485	180 - 300
HEB	180 - 1000	270 - 1500	180 - 300

Applications: Large, light spans with possibilities to incorporate building services in the structural height. Strength increases only slightly. Stiffness of the sections increases despite the increased shear deformations. Castellated beams are very sensitive to lateral torsion buckling and have reduced shear capacity.

Top hat beams

Fig. 8.10 Welded integrated beams (top hat beams)

Applications: Top hat beams are very useful in combination with prefab concrete floors such as hollow core slabs or composite floors. (see cb 6 and cb 7). By integrating the beam in the floor, the total structural height is reduced and fire resistance increased.