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TOWER CRANE FOUNDATION CALCULATION
1.0 GENE RAL NOTES The purpose of this document is to provide the structural analysis and design for the footing related to the tower crane. The Reference and Code of Standards used in the design are as follows: BS 8110
Structural use of Concrete - Code of Practice for Design and Construction
BS 8004
Code of Practice for Foundations
BS 449
Steel for the Reinforc ement of Concrete
Material Properties Concrete Compressive Strength @28 days: Fc := 40MPa Steel Bars of yield strength not less than 420MPa to be used for longitudinal & transeverse bars. Fy := 420MPa Soil Bearing Capacity SBC := 300
kN 2
m
2.0 DE S IG N CALCULATI ONS As per manufacturer data sheet, the most critical design loads were considered as follows: Moment (Overturning)
M := 70000kg g 4.5m M
Horizontal Force (Sliding)
=
3089 kN m
H := 63000kg g H = 618 kN
Gravity Load
V := 125000kg g V
=
1226 kN
Loading Combinations The given loads are mixed of dead loads, wind loads, and live loads. However, a 1.5 ultimate factor can be considered as conservative load factor for concree design. Geometry of Crane Legs The Crane have a base dimension with a square shape of 1.70m s ide length. The fixing leg of 1.30m length s hould be embedded with 1.0m inside the footing. This means that the footing should have a minimum thickness of 1.40m
Overturning Stability c alculations
Assume
h := 1.50m
Overturning Moment
Mo := M
Footing Weight
L
+
H ( h)
=
4016 kN m 4016kN m
W
=
Fw := 25 h L W Fw Stability Moment
1.5
Mst =
Mo
;
=
2
25 h L
L 2
Mst
=
V
Mst
=
613L + 19L
3
613L + 19L
+
Fw
L 2
3
−
4016 ( 1.5)
=
0
L := 8.5m
=
4016000000 N mm
Check Sliding and Soil Capacity Sliding: Sliding Coefficient:
δ :=
Sliding Force:
H := 618kN
Check Resisting Force
(V
+
0.50
)
Fw δ
1226
+
(V
+
( 25 1.50 8.502)
0.5 = 1968 > H = 618 kN
OK
Soil Capacity: Soil Stress:
f
=
)
Fw
+
Af
Mo L
3
6
f
1226
2709
+
=
+
2
3
8.5 f := 94
8.5
kN m
4016 6
<
2
SBC
=
300
kN 2
OK
m
Check Punching The fixing leg consists of several steel plates welded to the main shaft. The maximum force acting for punching is considered for case where the moments is diagonal on the footing.
