Engineering manuals for GEO5 programs - Part 1www.finesoftware.eu 1 Chapter 10. Design of geometry of spread footing In this chapter, we are going to show you how to design spread footing easily and effectively. Assignment: Using EN 1997-1 (EC 7-1, DA1) standards, design the dimensions of a concentric spread footing. Forces from columns act on the top o f foundation. Input forces are: y x y x MMHHN, , , , . The terrain behind the structure is horizontal; foundation soil consists of S-F – Sand with trace of fines, medium dense soil. At 6,0 m is Slightly weathered slate. The GWT is also at a depth of 6,0 m. The depth of foundation is 2,5 m below the original terrain. Scheme of the assignment – analysis of bearing capacity of spread footing Solution For solving this problem, we will use the GEO5 program – Spread footing. Firstly, we input all the data in each frame, except “Geometry”. In the Geometry frame, we will then design the spread footing. Basic input In the frame “Settings”, click on “Select” and then choose nr. 3 – “Standard – EN 1997 – DA1”.
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Engineering manuals for GEO5 programs - Part 1 www.finesoftware.eu
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Dialog window „Foundation dimensions design“
Note: Design of centric and eccentric spread footing is always performed such that that the dimensionsof foundation are as small as they can be and still maintain an adequate vertical bearing capacity. The
option “Input” designs the dimensions of a spread footing based on the entered bearing capacity of the
foundation soil.
We can verify the design in the frame “Bearing cap.”.
Frame „Bearing capacity“
Vertical bearing capacity: 97,7 % 59.53222.545 =>= σ d R [kPa]
SATISFACTORY .
Conclusion:
The bearing capacity of designed foundation (2,0x2,0 m) is satisfactory.