TORSIONAL VIBRATION TESTS ON EMBEDDED FOOTINGS

With a view to supplement the scarce amount of experimental data available in the literature, a detailed steady-state field test program of embedded footings subjected to torsional vibration was taken up. Seven precast reinforced concrete footings of various sizes and shapes were embedded in silty sand with some clay. A Lazan type mechanical oscillator was used to generate pure torsional excitation. The results indicate a decrease in resonant amplitudes of rotation and an increase in the resonant frequencies of vibration with increasing embedment. An increase in mass ratio increases the resonant amplitudes and decreases the resonant frequencies for footings kept at the same dept. As the length to width ratio of the rectangular footing increases there is a slight increase in resonant frequencies and slight decrease in resonant amplitudes. However, the variation in the response with regard to the shape of the footing is not significant.

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  • Accession Number: 00314633
  • Record Type: Publication
  • Report/Paper Numbers: ASCE 15288
  • Files: TRIS
  • Created Date: Oct 8 1980 12:00AM