The critical condition in machine foundation design is to avoid:
Choose the correct answer
High static loads
Resonance, where the natural frequency of the foundation-soil system matches the operating frequency of the machine (dynamic amplification -> excessive vibration)
Shallow foundation depth
Large foundation area
Correct Answer
B. Resonance, where the natural frequency of the foundation-soil system matches the operating frequency of the machine (dynamic amplification -> excessive vibration)
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Machine foundation: natural frequency fn = sqrt(k/m) / (2pi), where k = coefficient of elastic uniform compression x area, m = mass of foundation + machine. Design requirement: fn/fm (operating frequency ratio) < 0.6 or > 1.5 to avoid resonance zone. IS 2974 provides guidelines for different types of machines.
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