004 design and checking of the foundation

8/17/2019 004 Design and Checking of the Foundation

1/8

“Gh. Asachi” Technical University of Iasi

Faculty of Civil and Building Equi!ent Engineering

DESIGN AND CHECKING OF

THE FOUNDATION

"


2/8



DESIGN AND CHECKING OF

THE FOUNDATION

For the foundation design it is necessary the !a#ing of a geotechnical study.

Geotechnical study has the urose to identify the tye$ status and !echanic

features of the layers %hich co!ose the foundation terrain on active &one of the 'uilding$

and also hreatic level and su'terrain %ater characteristic in sight of esta'lishing the

conditions of foundation for the 'uilding.

Function of the follo%ed urose it has 'een esta'lished a volu!e of terrain

surveys consisting of drillings$ %ith the ossi'ility of 'ea#ing(off the layers on all the

active &one of the foundation .The sa!les of soil ta#en fro! the drillings %ill 'e analy&ed

in la'oratory.

Also there %ill 'e consulted end the geotechnical study reviously !ade in &one

and in surrounding.

In the studied &one it is designed the 'uilding %ith the follo%ing characteristics)

( regi!e of height * +,+-E

( strength structure fro! reinforced concrete fra!es !onolith + sla's !onolith + closings

of B.C.A.

( foundation syste!) isolated foundation fro! lain concrete and elastic ele!ent of /.C.

under fra!e colu!ns

After the interretation of the geotechnical value resulted fro! din la'oratory

analysis of the sa!les ta#en fro! the drillings 'ut also fro! consulting the geotechnical

value fro! unitary rofile of stratification$ on e!lace!ent result the follo%ing

stratification)

0 1ayer I ( argillaceous sandy silt and has the follo%ing characteristic)

h" 2 3.3 !

4 2 "5.65 789!:

; 2


3/8



; 2


4/8



II.Determination o "earing ca#acity o oundation terrain.

, l 2 !c 4 8" + q8

33.>2

l

'2

1

B

c

c B 2 1

Af 2 B 1 B 2 3:.- B D


5/8



III. Determination o t!e oundation c!aracteristics.

0 foundation %eight)

Gf 2 1 B f 4 ' >.53 2 ?"H 2 :56 78

,eff.!aM 2 ," 2 -:>.3 N ".< , l 2 -6:.< 789!<

,eff.!aM 2f

tot

A

82


6/8



The elastic ele!ent %ill 'e reinforced at inferior art %ith a 'ar net %hich are

arallel %ith the ele!ent lines. For the !o!!ents calculus necessary for the

reinforce!ent$ %e ta#e fro! the colu!ns 'ase corners$ straight lines inclined at -3= fro!

the foundation aMes. It is considered that the four o'tained surfaces are constrained in

colu!n and are loaded %ith a reactive ressure fro! the 'otto! elastic ele!ent.

0 Ac 2 lc ( 'c 2 ".< 2 ".--!<

0 Rc 2 'c lc.33H9< 2 >.:


7/8



y2 F H F H>:

:

&

>"

<

yc + E

6

l( (.:3 P >.>.:& 2 hoy P >.>" 2 >.:.>" 2 >.:"3 !

Re use C [email protected]$ %hich has / c 2 @> da89c!5:.>2B> 2 >.>@

> 2 >..>3

Aa& 2 <cy>y

c!55.52">>

"E3.:"E2

">>

'EhE 5;"< Aa&

eff 2 ?.>3 c!<

$I. Esta"lis!ing t!e dimensions o t!e oundation "loc&.

In the case of rigid foundation it has to 'e resected so!e value of the rigidity

angle.

l" 2 !6>.>2<

." P ->.<2

<

l P l c

"l

hO".:

6>.>

hO ".:> h 2 >.5> !

The 'loc# %ill 'e reali&ed in t%o stes h" 2 >.-> ! si h.-> !

$II. T!e 'eriication to local #ressure under t!e elastic element.

@


8/8



l< 2!6>.>2

<

>> 2 "3??@ 78

$III. T!e c!ec&ing o rigidity angle.

( on V(V direction) tgW" 26>.>

004 design and checking of the foundation

Documents