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035 _a.b10265624
099 9 _aAIT Thesis no. 704
100 0 _aChuchat Bunnag
245 1 3 _aAn experimental investigation of strains caused by a vibrating footing on sand
260 _aBangkok :
_bAsian Institute of Technology,
_c1974
300 _a130 p.
490 1 _aThesis ;
_vno. 704
500 _aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering at the Asian Institute of Technology, Bangkok, Thailand.
502 _aThesis (M.Eng.) - Asian Institute of Technology, 1974
520 _aModel tests were performed under laboratory conditions in order to obtain a better understanding of the strain distribution in the soil under a circular footing undergoing steady-state vertical oscillations. Four sand beds having two different densities and moisture contents were used as elastic half-space models. The vertical and radial strain components were measured by means of soil strain sensors embedded within the sand along lines extending radially from the source of excitation and the axis of symmetry. In order to evaluate the dynamic properties of the soil, the vertical component of surface displacement along radial lines extending from the source was also measured using vertical velocity transducers. From the measured strain amplitude the stress distribution beneath the footing could be determined. The tests results showed that the variation of strain amplitude was consistent with the theory. Measured resonant frequencies agreed fairly well with predicted ones, and the maximum strain occured at a depth approximately equal to the radius of the footing. The tests also revealed that the presence of moisture decreased the strain amplitudes and increased the resonant frequency, due to enhancement of material damping. The results also showed that the vertical stress distribution beneath the footing exhibited a character intermediate between a "rigid base" type and a "parabolic" type distribution.
650 0 _aStrains and stresses
650 0 _aSoil mechanics
_xVibration
650 0 _aSand
700 1 _aMoh, Za-Chieh,
_eChairperson
700 1 _aBrenner, R.P.,
_eCo-Chairperson
700 1 _aNelson, John D.,
_eExamination Committee
700 1 _aRichardson, A.M.,
_eExamination Committee
710 2 _aGovernment of Japan,
_eScholarship Donor
810 2 _aAsian Institute of Technology.
_tThesis ;
_vno. 704
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B24224
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