A precast concrete pile 25cm X 25 cm is driven by a single acting ste…

Question

A precast concrete pile 25cm X 25 cm is driven by a single acting steam hammer. Estimate the allowable load using (a) Engineering News record Formula (F.S.=6) (b) Hiley Formula(F.S.=4). Use the following data:

i) maximum rated energy = 3500 kN-cm

v) coeff. Of restitution = 0.5

ii) weight of hammer = 35 kN

vi) weight of pile = 3 kN

iii) length of pile= 15m

vii) no. of blows for last 25.4 mm = 6

iv) efficiency of hammer= 0.8

viii) modulus of elasticity of concrete = 2 X 10⁷ kN/m²

assume any other missing data, if required. Take the weight of pile as 73.5 kN.