Example C-1 · Bridge pier spread footing
Bridge pier spread footing. Example C-1 of Kimmerling (2002) solved in Rischio and compared with the source's answers.
SourceManual
Kimmerling, R. E. (2002). Geotechnical Engineering Circular No. 6: Shallow Foundations (FHWA-IF-02-054). Federal Highway Administration. Example C-1, p. C-13 to C-30.
ID fhwa-gec-6-c-1
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Source vs Rischio
| Source | Rischio | Difference | |
|---|---|---|---|
| Factored pressure on the effective area, q | 475 kPa | 475 kPa | +0.1 % |
| Eccentricity along the width, ey | 0.033 m | 0.033 m | −0.1 % |
| Eccentricity along the length, ez | 0.117 m | 0.117 m | −0.1 % |
The example, worked to AASHTO LRFD 1998, checks the eccentricity only under the minimum load factors, without the live load, and those are the values shown. Rischio checks every Strength I combination: the minimum dead load factor with the live load gives a larger eccentricity along the width, 0.104 m.