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Chapter 12.5, Problem BYGV
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Explain the meaning of the terms duty cycle, foot candle, efficacy, CRI, CFL and LED.

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It proposed to provide pile foundation for a heavy column; the pile group consisting of 4 piles. placed at 2.0 m centre to centre, forming a square pattern. The under-ground soil is clay, having cu at surface as 60 kN/m², and at depth 10 m, as 100 kN/m². Compute the allowable column load on the pile cap with factor of safety of 3.0, if the piles are circular having diameters 0.5 m each and length as 10 m.
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