By Iain Alasdair MacLeod
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Additional resources for Analytical modelling of structural systems : an entirely new approach with emphasis on behaviour of building structures
12. 46. Similarly, for surface foundation conditions (that is, β = 0 and m = 0), the ultimate bearing capacity of a continuous foundation can be given as qu = q′ + q′′ = c N c + q N q + ↑ (Eq. 69 ) ↑ (Eq. 72). 73 is presently used. 12. 4φ) Nγ = (Eq. 74. 84 GENERAL DISCUSSION ON THE RELATIONSHIPS OF BEARING CAPACITY FACTORS At this time, the general trend among geotechnical engineers is to accept the method of superposition as a suitable means to estimate the ultimate bearing capacity of shallow rough foundations.
Determine the following forces per unit length of the wedge at right angles to the cross section shown: (a) weight of wedge bcdf—W, and (b) Rankine passive force on the face df—Pp(R). 8. 71) where Ppγ = passive force due to γ and ϕ only Note that the line of action of Ppγ acting on the face bc is located at a distance of 2bc/ 3. 9. For given values of β, ϕ, and m, and by changing the location of point O (that is, the center of the log spiral), repeat steps 5 through 8 to obtain the minimum value of Ppγ.
Zone abc. This is a triangular elastic zone located immediately below the bottom of the foundation. The inclination of sides ac and bc of the wedge with the horizontal is α = ϕ (soil friction angle). 2. Zone bcf. This zone is the Prandtl’s radial shear zone. 3. Zone bfg. This zone is the Rankine passive zone. The slip lines in this zone make angles of ±(45 − ϕ/2) with the horizontal. 1. 1) Lines bf and fg are straight lines. Line fg actually extends up to the ground surface. Terzaghi assumed that the soil located above the bottom of the foundation could be replaced by a surcharge q = γDf.
Analytical modelling of structural systems : an entirely new approach with emphasis on behaviour of building structures by Iain Alasdair MacLeod