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Nemetschek Frilo GmbH - Applications for structural calculation and design

Product details www.frilo.com As of: 14/11/2012

FDB

Pad Foundation

The FDB application allows youto design block foundations.

Block foundations are cast witha bucket.

They are characterized by atoothed connection betweenthe bucket wall and the columnbase. This connection has thesame effect as if the columnwas fitted with a monolithicfoundation.

The design of the block founda-

tion is performed separately foraxial force and moment.

Standards

DIN EN 1992 NORM EN 1992

BS EN 1992

NEN EN 1992 EN 1992

DIN 1045/1045-1

Norm B4700

Soil standard:DIN EN 1997-1 in conjunc-tion with DIN 1054:2010.NORM EN1997-1DIN 1054:1976/2005.

Design for axial force

In contrast to isolated founda-tions, the design for axial forceacting on the block foundationis performed for the sectionalong the column edge. Thebending design resulting from

the axial force is performed inaccordance with leaflet 240, P.2.10. The values are put outseparately for the x and y direc-tion.

Design for moment

The design for the moment isperformed on the equivalentbeam.

The width of the equivalentbeam is as follows for each ofthe loading directions:

b= cx + hm or b = cy + hm.In this equation, cx and cy referto the dimensions of the columnand hm to the effective height.

The reinforcement resultingfrom the design is distributedover half the width of theequivalent beam and runs up-wards at the correspondingside of the bucket serving as aconnecting reinforcement.

The punching shear analysis is

performed in the state of as-sembly as well as in the finalstate in accordance withDIN 1045, Paragraph 22.5 orDAfStb1, Booklet 240, Para-graph 2.5. The decisive re-duced shear force Qred is cal-culated by reducing the existingcolumn load by the reactionforce of the soil pressure por-tion attributed to the base sur-face of the punching cone.

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In addition, the compressionsare determined in accordancewith DIN 1054 and the locationof the gaping joint is assessed.You can define result loadcases and superposition load

cases.

Result load cases(design)

Loads for result load casesmust be entered with consid-eration to the safety factor.Result load cases have beenproduced in the calculation ofanother component. Undernormal conditions, they resultfrom a superposition Result

load cases are not superim-posed.

Superposition load cases

In addition to result load cases,the application is also familiarwith superposition load cases.A permanent or variable actionwas assigned to these loadcases.You must enter the 1.0-foldvalue for these loads.The application superimposes

these load cases.This means that they do notinclude any second-orderloads.In accordance with DIN 1045 -1, the design is performed forthe decisive superpositioncombination whereby the appli-cation includes the decisivevariable load case with 1.0 Gamma.You can include the followingload types in the calculation:

Vertical concentrated load Vapplying at the point ax/ay,

Horizontal loads Hxand Hy

External moments Mxand My

Earth top load and additionaluniformly distributed loadacting on the foundation sur-face and additional verticalconcentrated loads applyingat freely selectable points.

"Block foundations forpoles...." option

Restrained block foundationsfor poles, signs, signal boardsand noise-protection walls areblock foundations embedded in

the ground. The loading is ap-plied via a moment in the firstplace. Their stability is ensuredby the earth resistance.

The serviceability analysis ofthese foundations is performedin accordance with the sub-grade reaction modulus methodpublished by Sulzberger inSwitzerland in 1945.

The stability analysis of these

foundations in performed inaccordance with an article pub-lished by Sebastian Steckner inthe magazine Bautechnik(66/1989). In this article, hecorrects the discrepancies inSulzberger's theory and makesclear what happens in the tran-sition area when the base fric-tion is overcome. Furthermore,he enhances Sulzberger'smethod in regard to slopedground surfaces and estab-

lishes a relation between the

subgrade reaction modulus andthe earth pressure coefficient.These improvements are im-plemented in the software ap-plication.

Interface to the soil failureanalysis GBR

If the soil failure application(GBR) is installed, you cantransfer data from the founda-tion application to it and viceversa.

1German Committee for Rein-forced Concrete