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100% UR for tension even when i reduce the load.

Posted by Laurenceabout 4 years ago
100% UR for tension even when i reduce the load.

100% UR for tension even when i reduce the load. Yet it still appears green and print out states checks are OK. 100.1% is not okay obviously. So i feel uneasy specifying fixings with 100% UR. But reducing the load should reduce the UR, no?

100% utilisation ratio,tension in anchor
1 Reply
Posted by Ask HILTI Teamabout 4 years ago

Thanks for your question. The utilisation rate at 100% is perfectly acceptable, I assume you have applied your load partial safety factors against your input. The product will also have material safety factors applied as per it’s ETA to establish the Design Resistance.

The difference of the 0.1% I suspect will just be a rounding issue and based upon the partial safety factors applied, it would be reasonable to take an engineering view that it isn’t an issue. 

Regarding reducing the utilisation, I suspect you have selected the embedment depth optimisation option in the calculation functionality. The software will then look to give you the most efficient design based upon your inputs, reducing the load could also still lead to the same level of utilisation.

2 comments on this reply
Posted by Ask HILTI Teamabout 4 years ago
Hi, in the software you have two options in relation to your load input. The default being Design Loads. In this case you are correct with the ULS / factored load where you have already applied your partial load safety factors. The second option is Characteristic Load (Unfactored / working load) where the software applies the default load partial safety factors against inputted values.
Posted by Laurenceabout 4 years ago
Thank you . So the load input table requires factored ULS loads to be inputed? You other response regarding embedment depth optimization option is what has occurred. Thank you.