Can we check an allowable bearing pressure against serviceability loads in Tekla Structural Designer?

Tekla Structural Designer
2021
Tekla Structural Designer
2020
Tekla Structural Designer
2019i
Tekla Structural Designer
2019
Tekla Structural Designer
2018i
Tekla Structural Designer
2022
Tekla Structural Designer
2023
Tekla Structural Designer
Allowable bearing pressure
Design by prescriptive measures
Bearing capacity
Environment
Eurocode

Question


We often receive Soil Investigation Reports with allowable bearing pressures for use with pad / strip footing design which can be used in accordance with BS EN 1997 CL 2.5 "Design by prescriptive measures".

This capability is available in Tekla Tedds, where the allowable bearing pressure is checked against the serviceability loads applied.

Image
image7.png


Is a similar option available within Tekla Structural Designer as it would appear it will only check bearing capacity based upon the ULS design bearing pressure against the net ultimate bearing capacity?

Image
image3.png



Image
image4.png

 

Answer


Tekla Structural Designer can undertake foundation bearing capacity checks on pad bases and strip footings using two alternative methods allowed in BS EN 1997-1
  1. Ultimate Bearing Pressure (default)
  2. Presumed Bearing Resistance


The choice of method is controlled via the user setting Foundation ribbon tab > Options > Concrete > Foundations > Isolated Foundations > General Parameters > “Use presumed bearing capacity check (EN1997-1 cl.6.5.2.4)" setting.

Image
image2.png


By default this is unchecked so method 1 “Ultimate Bearing Pressure” is adopted as shown in the calculation results above.

If this option is checked, method 2 “Presumed Bearing Resistance” is adopted.

Note that the Pad base or Strip footing properties will need reviewing as this settings change requires a Presumed bearing resistance to be specified.

Image
image5.png


Following a design you will see a Service loads - Applied Loads Summary. The bearing capacity check is then based upon this sls pad base pressure checked against the Presumed bearing resistance.



Image
image6.png



Image
image1.png
Was this helpful?