- --------- --------- -------- -------- ----- ----- ------ --------Pile cap (4 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 :
Mix Development Taman Batu Berendam, Melaka P4-150
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 = = =
= = = =
1160 4 290 580
150 mm 3.0 x d 150 mm 150 mm 900 mm 900 mm 550 mm 175 350 100 75
mm mm mm mm
2 Pile cap material - --------- -------Concrete strength fcu = Steel strength fy =
---
### 02:49 AM
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 = 15.5 mm Ultimate design moment Mx = Eff. depth dx = K = Lever arm zx =
---
225 mm 50 mm
29.0 kNm 442.3 mm 0.0066 420.1 mm mm
Reinforcement required As req = 644 mm2 No. of bar = 4 No. Bar spacing = 245 mm
Reinforcement provided As prov = 943 mm2 No. of bar = 5 No. Bar spacing = 184 mm Max spacing = 284 mm mm
Design of Pile Cap to BS 8110
JPT Sdn Bhd
100As/bd
=
0.24
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 = 15.5 mm Ultimate design moment My = Eff. depth dy = K = Lever arm zy =
225 138
mm mm
79.8 kNm 426.8 mm 0.0195 405.4 mm
Reinforcement required As req = 644 mm2 No. of bar = 4 No. Bar spacing = 245 mm
Reinforcement provided As prov = 943 mm2 No. of bar = 5 No. Bar spacing = 184 mm Max spacing = 284 mm 100As/bd = 0.25
4 Normal shear - --------- --X direction --------- -Vx = 580.0 vx = 1.46 vc = 0.39 av = 5 Enhanced shear =
kN N/mm2 N/mm2 mm 4.00
N/mm2
Normal shear O.K.
Y direction --------- -Vy = 580.0 vy = 1.51 vc = 0.40 av = 92.5 Enhanced shear =
kN N/mm2 N/mm2 mm 3.65
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 1050 mm 2.54 N/mm2
Punching shear O.K.
(deformed bar type 2)
442 504
mm mm
Anchorage O.K.
Design of Pile Cap to BS 8110
Y direction --------- -Anchorage length required = Anchorage length available =
