- --------- --------- -------- -------- ----- ----- ------ --------Pile cap (5 pile group) design by bending theory to BS 8110 Part 1 4.11.1991 - --------- --------- -------- -------- ----- ----- ------ --------Pile spacing from center to center should not exceed 3 times the pile diameter and BS 8110 Part 1 clause 3.11.4 should applied Project : Pilecap :
Hyatt Regency Hotel JB P5-450
Column ultimate axial load Total Total number number of piles piles Pile ultimate axial load Total load for 2 piles 1 Pile cap geometry - --------- -------Pile diamter, d = Pile spacing, s = Outstand, do = Outstand, bo = Pile cap length D = Pile cap breadth B = Pile cap depth H = Column length Column breadth Bottom cover Side cover
d = b = = =
22425 5 4485 8970
450 mm 3 x d 150 mm 150 mm 2659 mm 2659 mm 1650 mm mm mm mm mm
2 Pile cap material - --------- -------Concrete strength fcu = Steel strength fy =
kN No. kN/pile kN/pile Y | ------
--- + -- --------+ ^ | ### ### | | | ### ### | | | | ### | X - - B | ### | -- X | | | | ### ### | v | ### ### | --- + -- ---- ------ -----+ | <------- D -------> | Y
25 N/mm2 410 N/mm2
3 Reinforcement design - --------- --------- X direction --------- -Pile center to pile cap center distance = Pile center to column face distance = Bar diameter = 25 mm Ultimate design moment Mx = Eff. depth dx = K = Lever arm zx =
---
### 02:29 AM
= = = =
1200 300 100 75
---
### mm ### mm
7217.2 kNm 1537.5 mm mm 0.0459 1454.6 mm mm
Reinforcement required As req = 13910 mm2 No. of bar = 29 No. Bar spacing = 89 mm
Reinforcement provided As prov = 6872 mm2 No. of bar = 14 NOT Bar spacing = 191 NOT Max spacing = 116 mm mm
Design of Pile Cap to BS 8110
JPT Sdn Bhd
100As/bd
=
0.17
Design of Pile Cap to BS 8110
JPT Sdn Bhd
|:: Y direction --------- -Pile center to pile cap center distance = Pile center to column face distance = Bar diameter = 25 mm Ultimate design moment My = Eff. depth dy = K = Lever arm zy =
955 355
mm mm
3180.7 kNm 1512.5 mm 0.0209 1436.9 mm
Reinforcement required As req = 6206 mm2 No. of bar = 13 No. Bar spacing = 207 mm
Reinforcement provided As prov = 11781 mm2 No. of bar = 24 No. Bar spacing = 108 mm Max spacing = 325 mm 100As/bd = 0.29
4 Normal shear - --------- --X direction --------- -Vx = 8970.0 vx = 2.19 vc = 0.35 av = 669.6 Enhanced shear =
kN N/mm2 N/mm2 mm 1.60
N/mm2
Normal shear fail
Y direction --------- -Vy = 8970.0 vy = 2.23 vc = 0.42 av = 219.6 Enhanced shear =
kN N/mm2 N/mm2 mm 4.00
N/mm2
Normal shear O.K.
5 Punching shear - --------- ----Spacing of the piles should be less than or equal to 3 x diameter Allowable punching shear = Perimeter of column = Punching shear stress = 6 Bar anchorage - --------- ---fbu = 2.50
N/mm2
X direction --------- -Anchorage length required = Anchorage length available =
4.00 N/mm2 3000 mm 3.92 N/mm2
Punching shear O.K.
(deformed bar type 2)
1847 1741
mm mm
Anchorage fail
Design of Pile Cap to BS 8110
Y direction --------- -Anchorage length required = Anchorage length available =
