Consideration of the effect of embedment depth and lateral backfilling of machine foundations on the dynamic properties of their beds
Conclusions
1. Recommendations are given for consideration of the effect of embedment and lateral backfilling in determining the stiffness and damping coefficients of the beds of foundations concreted under pressure against the soil, or in forms with the condition that backfilling be carefully performed.
2. A method is proposed for the calculation of the horizontal-rotary oscillations of embedded machine foundations; this method makes it possible to use computational equations familiar for nonembedded foundations with varied initial data.
3. The developed computational methods are confirmed experimentally, indicating their applicability. The proposed method is most reliable for a set of predicted parameters of the horizontal-rotary and vertical oscillations of embedded foundations.
4. The developed computational methods are being incorporated in a reference manual on the design of machine foundations with dynamic loads, which is being prepared for publication.
Keywords
Civil Engineer Initial Data Dynamic Property Dynamic Load Structural FoundationPreview
Unable to display preview. Download preview PDF.
Literature cited
- 1.M. I. Zabylin, Design of Machine Foundations: Educational Manual [in Russian], Novosibirsk (1983).Google Scholar
- 2.G. Gazetas, "Analysis of machine foundations: state of the art," Int. J. Soil Dynam. Earthquake Eng.,2, No. 2, No. 1, 2–42 (1983).Google Scholar
- 3.Construction Rule And Regulation 2.02.05 87. Dynamically Loaded Machine Foundations [in Russian].Google Scholar
- 4.Design Guidelines for Dynamically Loaded Machine Foundations [in Russian], Stroiizdat, Moscow (1982).Google Scholar
- 5.M. L. Kholmyanskii, "Calculation of stiffness coefficients for inhomogeneous beds of dynamically loaded machine foundations," Tr. Vses. Nauch.-Issled. Inst. Osn. Podzem. Sooruzh., No. 87, 125–133 (1987).Google Scholar
- 6.M. L. Kholmyanskii, "Determination of the stiffness coefficients of the beds of embedded machine foundations by the method of boundary integral equations," Tr. Vses. Nauchn.-Issled. Inst. Osn. Podzem. Sooruzh., No. 86, 81–102 (1986).Google Scholar
- 7.M. N. Golubtsova and M. L. Kholmyanskii, "Experimental investigation of the oscillations of test foundations subjected to changes in their mass and depth of embedment," Moscow (1967) (deposited in the All-Union Scientific Institute for Construction Information on 15 July 1987, No. 8113).Google Scholar
- 8.V. A. Il'ichev and M. L. Kholmyanskii, "Allowance for embedment in determining the stiffness and damping coefficients of the beds of machine foundations," Dynamics of Beds, Foundations, And Underground Structures: Theses of Papers Submitted at the Seventh All-Union Conference [in Russian], Moscow (1989), pp. 31–32.Google Scholar
- 9.M. M. Klattso and A. D. Kondin, "Calculation and design of dynamically loaded machine foundations," Designers Handbook: Complex Beds And Foundations [in Russian], Stroiizdat, Moscow (1969), pp. 243–271.Google Scholar
- 10.Y. O. Beredugo and M. Novak, "Coupled horizontal and rocking vibration of embedded footings," Can. Geotechn. J.,9, No. 4, 477–497 (1972).Google Scholar
- 11.F. Elsabee, "Static stiffness coefficients for circular foundations embedded in an clastic medium," Master of Science thesis, Massachusetts Institute of Technology, Cambridge (1975).Google Scholar
- 12.S. K. Lapin, "Experimental investigations and refinement of methods of calculating the vertical oscillations of rigid foundations and their beds," Author's Abstract of Dissertation for Candidate of Technical Sciences, Leningrad (1982).Google Scholar
- 13.M. Novak and Y. O. Beredugo, "Vertical vibration of embedded footings," Proc. Am. Soc. Civ. Eng., 98, No. SM12, 1291–1310 (1972).Google Scholar
- 14.M. J. Kaldjian, "Discussion," Proc. Am. Soc. Civ. Eng.,95, No. SM1, 364–366 (1969).Google Scholar