Combined Pile-Raft Foundations

The “Combined Pile-Raft Foundations” program is used to analyze and design combined pile-raft foundations (CPRF) taking into account the elastic support of the raft and the pile-pile and pile-raft interactions. Alternatively, pile groups can be analyzed using a load-distributing head plate. Taking into account the load transfer via the plate, the load is distributed to the piles and the required pile length is determined.

To the editions

Only available in FRILO Geotechnic Professional und FRILO Geotechnic Ultimate

Performance characteristics

Input Design Standards Output options Interfaces

Material

Reinforced concrete with selectable concrete and steel grades

Structural system

Rectangular, circular, or polygonal plate
Selectable pile types: bored piles, displacement piles (driven piles) and micro piles (grouted piles)
As compression piles or tension piles
Vertical or with an inclination
Pile group with a load-distributing head plate without elastic support, the pile-pile and pile-plate interactions are not considered
Combined pile-raft foundation (CPRF) with consideration of the pile-pile and pile-raft interactions

Soil

Variable soil stratification with specification of the characteristic parameters: skin friction, peak pressure and stiffness modulus for the foundation
The characteristic values for the skin friction and the peak pressure specified by DIN 1054, ÖNORM B 1997 and the EA Recommendations are available for cohesive and non-cohesive soils and rock
User-defined default settings for all relevant layer parameters
Parameter suggestions for standard soils
Optional definition of soil stratification using individual borehole points to account for inhomogeneous layer thicknesses
Automatic interaction of inhomogeneous layer thicknesses when multiple borehole points and their local layer profiles are known

Terrain

Assumption of horizontal terrain in the vicinity of the pile grate

Groundwater

Optional specification of a constant groundwater horizon
Automatic interaction of an inhomogeneous groundwater horizon if several borehole points and their groundwater levels are known

Loads

Multiple load cases with vertical and horizontal concentrated loads and line loads as well as concentrated moments and line moments, area loads
Automatic generation of the load case combinations with the combination coefficients psi

Vertifications

Analysis and representation of the pile internal forces, the pile settlements incl. interactions, the soil pressure and the deformations as well as of the raft internal forces
Analysis of the plate and the bearing effect of the piles (FEM analysis with isoparametric quadrangular elements)
Analysis of the elastic support of the raft taking into account the bearing effect on the piles (FEM analysis with isoparametric quadrangular elements)
Analysis of a bedded raft without piles is possible
Analysis of the CPRF taking into account the influence of the piles on the other piles and the raft and vice versa in accordance with El Gendy, Hanisch, Kany

Reinforced concrete design

Design of the piles and the raft, analysis of the required reinforcement and, if necessary, a punching shear analysis at the pile heads

Geotechnical vertifications

Analysis of the load distribution on the piles and the required pile lengths
Automatic iteration to find the state where the raft foundation and the pile settlement are in equilibrium

Output

Detailed output of the individual load cases as text and graphics
Detailed output of the required and selected reinforcement for the limit states of load-bearing capacity
Detailed output of all relevant geotechnical verifications with utilization rates

File formats

PDF
Printer

Export options

RTF export to MS Word
Graphic export in JPG format
DXF export

Geotechnical standards

EN 1997-1
DIN EN 1997-1
ÖNORM B 1997-1-1
NF EN 1997-1
BS EN 1997-1
UNI EN 1997-1 with NTC 2018
UNE EN 1997-1
DIN 1054
DIN EN 1536
BS 8004
SIA 267
ÖNORM B 4440
Recommendation of the Pile Work Group EA-Pfähle

Reinforced concrete

EN 1992
DIN EN 1992
ÖNORM B 1992
NF EN 1992
BS EN 1992
UNI EN 1992
DIN 1045
SIA 262
ÖNORM B 4700
BS 8110

Steel

EN 1993
DIN EN 1993
ÖNORM B 1993
NF EN 1993
BS EN 1993
UNI EN 1993
SIA 263
BS 5950

Support resources

Video tutorials

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