00 Contents - Hilti Svenska AB
00 Contents - Hilti Svenska AB
00 Contents - Hilti Svenska AB
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Steel base material<br />
Compressive stress in the steel<br />
Compressive stress in the base steel has no influence on pullout strength of the fastener.<br />
This was demonstrated by placing fasteners in unstressed 15 mm [0.59"] thick steel plates<br />
having a yield strength of 259.3 MPa [37.6 ksi] and extracting them while the plates were<br />
compressed in a testing machine.<br />
The minimal variation in pullout load is simply random variation experienced in testing.<br />
Pullout Load (kN)<br />
25<br />
20<br />
15<br />
10<br />
5<br />
0<br />
0 20 40 60 80 1<strong>00</strong> 120<br />
Stress in steel (% of yield)<br />
5 ki ps<br />
4<br />
3<br />
2<br />
1<br />
5.3 Suitability of the steel for fastening<br />
There are three main factors determining the suitability of a construction grade steel member<br />
for DX fastening:<br />
• Steel thickness<br />
• Ultimate tensile strength<br />
• Flexibility of the base steel member<br />
11 / 2<strong>00</strong>7 1.41
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