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1) Natural frequency of the system should not be within 20% of the operating frequency of machine2) The bearing pressure on the soil should be within 50% of the allowable value used for building foundation3) The weight of the foundation need to atleast 3.0 times the weight of machine to minimize vibration4) The minimum reinforcement In each direction: 0.18%5) Horsepower >=500, The foundation shall be designed for the expected dynamic forces as per the code6) Horsepower <500 & total weight < 30 kN, The foundation shall be designed for static checks only7) Minimum thickness of concrete foundation = Greater of((width/5, Length/10, 2ft) & (L/30+0.60m))8) Minimum width of footing = 1.0 to 1.5 times the vertical distance from base of footing to machine centerline9) Minimum size of rebar shall be 13mm10) Maximum allaowable eccentricity in both direction in plan shall be 5% of width or length respectively11) High tuned foundation = Operating frequency of machine is below natural frequency of system (SBC = 50% of Allowable)12) Low tuned foundation = Operating frequency of machine is above natural frequency of system (SBC = 75% of Allowable)13) If Rotor Wt of machine > 1/100( Weight of machine + foundation ) detail dynamic analysis should be performed14) If Dynamic force of machine > 1/1000( Weight of machine + foundation ) detail dynamic analysis should be performed
- Submitted By:
- montu (montupatel)
- Submitted On:
- 30 Nov 2014
- File Size:
- 187.00 Kb
- File Version:
- File Author: