Technical Support – Foundation on Rock

This design example is based on a question asked by our customer, it is about strut-tie model of rock foundation supporting load in uplift. The geometrical shape of the foundation is shown in the following figure.

Foundation_on_Rock

This example requires two truss analyses to include main tension reinforcements in strut-tie model. The design procedure for this example is as follows.

Step 1 : Construct the strut-tie model excluding elements representing main tension reinforcements according to compressive principal stress flow.

Foundation01

Step 2 : After performing the truss analysis, find the vertical reactions at nodes 1 and 2.

Foundation02

Step 3 : After adding the element representing main tension reinforcements in the strut-tie model, the reactions determined in the above model are loaded.

Foundation03

Step 4 : After performing the analysis of modified strut-tie model, perform strength verification of struts, ties, and nodal zones.

Foundation04

Foundation05

Foundation06

Foundation07

Foundation08


 

Example File Downloads : Foundation_on_Rock.stm

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