A large 20-story steel structure is planned for an office building the Denver Metropolitan. The exploration...

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Civil Engineering

A large 20-story steel structure is planned for an officebuilding the Denver Metropolitan. The exploration program revealedthat foundation soil comprises of 25-foot clay with undrained shearstrength of 1,000 psf overlying a thick stiff clay shale with theundrained shear strength of 3,000 psf. To avoid construction noise,the architect selected 3-ft diameter drilled shaft foundation. Thedrilled shafts are socketed 15 feet in the stiff clay shale.Calculate:
a. The ultimate capacity of the drilled shaft.
b. Estimate the total structural dead load.
c. Estimate the office building life load.
d. At a factor of safety of 2,5, how many drilled shafts wouldbe required?
Note: When you suspect some missing information, please makereasonable assumption(s) and process with your solution. Clearlyshow why assumption(s) is needed.

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3.7 Ratings (651 Votes)

Ans GivenThickness of clay layer 25 ftUndrained shear strength of overlying soil 1000 psfUndrained shear strength of below soil 3000 psfDiameter of drilled shaftd 3 ftLength of pileL 15 fta We knowUltimate capacity of pileQ Bearing capacity Skin frictionresistanceQ qb Ab qsAsQ C NcAb C See Answer

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