analisis pondasi pbrs

8/15/2019 ANALISIS PONDASI PBRS

1/9

ANALISIS PONDASI

Desain Pondasi Cerucuk

Tipe Pondasi :1) Tipe A ( 1,4,13,16)) Tipe ! (,3,",#,$,1,14,1")3) Tipe C (6,%,1&,11)

Dari 'asi oupu *oin reaksi

diperoe' :

Pondasi Tipe A

Kedalamaan tiang (df ) = 3,4 m

Hasil Data sondir :

Nilai qc = 4D di!a"a# tiang, $arena dipancang sedalam

tana# $eras ma$a diam!il qc pada $edalaman pancang

Niai +c1 (4D dia-a' ian. )

Kedalaman

(m)

Nilai $on%s (&)

($g'cm) 3,4

/enis P (k.) 0(k.2)

0(k.2)

A *++,*3

43-,*

3-,

. /-,3

4+-,/3

4**,4+

& +,+

4**, 4/,-


2/9

0ata 1 rata nilai

$on%s

Nilai qc = + 2 D = + 2 + = *4 cm

Tae 1&2 Niai +c (#D diaas ian. )

Kedalaman

(m)

Nilai $on%s (&)

($g'cm)3,4 3, 3 +

,+ 4* -

0ata 1 rata nilai$on%s /

Nilai qc (qc qc)' = *3,- $g'cm

Nilai 5HP = $g'cm

Diameter tiang pancang (D) = + cm

6%as tiang = 7 8 34 8 D

= -*-4 cm

Keliling tiang pancang (K) = 3,4 2 D

= 3,4 2 + = -,3 cm

.erat tiang = 6%as 8 d 8 γ

= -,*-4 cm 8 3,4 cm 8

$g'cm3

= /, $g

As%msi !erat poer plat ( 9) = 8 *4+/3 $g

= *4+,/3 $g

Ptotal = P .erat tiang .erat poer

plat

= (*++,*3 /,

*+,+*) $g

= /-3-,* $g

= /-,3-* ton


3/9

a) Per'iun.an daa dukun. pondasi sau ian.K%at End Bearing ' %%ng tiang (;P)

;% =(0,25× π × D2 )×(qc )

3 8

K x JHP5

=(0,25×π ×82 )×(163,5)

3 x 25,13 x200

5=¿ 3/44,//

$g = 3,/4- ton

) Per'iun.an kapasias ian. .rup

Data 1 data perencanaan tiang gr%p

Direncana$an tiang gr%p dengan $oneng#it%ng !e!an ma$sim%m tiang pada $elompo$ tiang

Pma8 =

P

n

My x X max

n y x X 2

Mx x y max

n x x y2


4/9

8ma8 = ,- m

?ma8 = ,3 m

Σ 8 = (4 8 8 ,-) (4 8 8 ,3) (4 8 8 ,) = ,+ m

Σ ? = (* 8 8 ,3) (* 8 8 ,) = ,4 m

P = /-, 3-* $g

>8 = 4,3-* tonm

>? = 3,-3 tonm

Pma8 = P

n My x X max

n y x X 2

Mx x y max

n x x y2

Pma8 =75,0356

24 4,3526 x0,5

4 x2,8 3,9539 x 0,3

6 x 1,4

Pma8 = 3,4-+ ton

.e!an ?ang diterima tiang ma$sim%m = 3,4-+ ton @ da?a

d%$%ng tiang

;%lt = n 8 ;iin 8


5/9

>enent%$an Te!al Poer Plat- As%msi te!al poer plat (#t) = mm- Te!al efe$tif poer plat (d) = #t 1 d

= 1 /-= - mm

->enent%$an $eliling penampang $ritis (!o):!o = 4 (#c d)

= 4 ( 4 -)= -3

- A$si geser d%a ara#:

>enent%$an nilai ФVc :

!c =hc

bc =

400

400=1

• c =1

6

(1+

2

bc

)√ f c

' . bo . d

=1

6 (1+ 21 )√ 25 5300 -= -*,- $N

• c =1

12 ( α . dbo +2)√ f c'

.bo . d

Dimana E= 3

=1

12 ( 30 x 9255300 +2)√ 25 5300 -= 4/+,/3 $N

• c3= 0,33√ f c' .bo .d

= 0,33√ 25 5300 -

= ++,- $N

Diam!il nilai c ter$ecil = ++,- $N

ФVc : = ,* 8 ++,- = 4+-3,4/- $N


6/9

>enent%$an T%langan Pile &ap Ara# F:

>omen

d8 = #t 1 ds 1 G Dt

= 1 /- G -

= ,- mm

= ,- m

d8 1 ,- !c d

,- 1 ,-4 - mm

/,- mm - mm

>% = 3- Nmm

>omen Nominal

>n = M u

Ф =39529100

0,8=¿ 443/- Nmm

3 0asio T%langan >inim%m

ρmin=1,4

fy =

1,4

270=¿ ,-

4 0asio T%langan ma$sim%m ρmaks = ,/- ρb

ρmaks

= ,/-

+⋅

⋅⋅

)600(

600'85,0 1

fy fy

fc β

= ,34*

- Koefesien $eta#anan

Rn = Mn

b .d2=

49411375

1200 x 9252 = ,4+ N'mm

* 0asio t%langan perl%

)f 0,85.

21(1

'.85,0'

c

n

perlu

R

fy

fc−−= ρ

= ,/+44

perl u ρ

@ ρmin

ma$a dipa$ai ρ=0,0052


7/9

/ 6%as T%langan perl% (As)

As = I!d8

=,- ,-

= -/--,--* mm

Dico!a t%langan D = - mm

%mla# t%langan ?ang dipa$ai:

n = s !"#$u

s%u$

=5755,556

490,8734=12 !%a#

s %u$an&an = n (

s %u$¿

= -+,4+ mm

J?arat : s %u$an&an s !"#$u

-+,4+3 mm -/--,--* mm CCC

Aman

+ 5ara$ t%langan %tama(s)

s =

s%u$ .

s !"#$u

=490,8734 .1200

5755,556

= 3,/ mm

Diam!il ara$ t%langan J = mm

ce$ ara$ antar t%langan:

J @ - mm

@ - mm CC Aman


8/9

Ta!el P total

TipePondasi

As%msiPoer plat

($g)

P total(ton)

A *+,+*3/-,3-

-+

. /,-3,3

+

& +,//,

-+

Ta!el Kapasitas

TipePondasi

P total 5%mla

#tiang

Pma$s

; %lt Ket

Tipe A/-,3-

-+4 3,4-+

+,+/4*

L$

Tipe . ,3+

3 3,* ,3433

L$

Tipe &,

-+3* 3,--/

34,+

L$

Ta!el Dimensi pilecap

TipePondasi p(m) l (m)

A , ,+

. , & , ,

Ta!el Titi$ pondasi

TipePondasi

.an?a$titi$

P >8 >?


9/9

A 4*++,

*343-,

*3-,

. +/-,

34+-,

/34**,

4+

& 4+

,+

4**,

4/,

-

Ta!el Hasil per#it%ngan Pen%langan Pilecap

Tipe Pondasi Te!alPilecap

T%langandipa$ai

A D-

. D-

& D-

analisis pondasi pbrs

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