/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. Engineering, 22, 5, pp. 849-860, 1995-10-01 Effects of tire -pavement contact pressure distributions on the response of asphalt concrete pavements Yue, Z. Q.; Svec, O. J. Canadian Journal of Civilhttp://www.nrc-cnrc.gc.ca/irc Effe c t s of t ire -pa ve m e nt c ont a c t pre ssure dist ribut ions on t he re sponse of a spha lt c onc re t e pa ve m e nt s NRCC-38864Yue, Z.Q.; Svec, O.J. October 1995A version of this document is published in / Une version de ce document se trouve dans:Canadian Journal of Civil Engineering, 22, (5), pp. 849-860, October 01, 1995 The material in this document is covered by the provisions of the Copyright Act, by Canadian laws, policies, regulations and international agreements. Such provisions serve to identify the information source and, in specific instances, to prohibit reproduction of materials without written permission. For more information visit http://laws.justice.gc.ca/en/showtdm/cs/C-42Les renseignements dans ce document sont protégés par la Loi sur le droit d'auteur, par les lois, les politiques et les règlements du Canada et des accords internationaux. Ces dispositions permettent d'identifier la source de l'information et, dans certains cas, d'interdire la copie de documents sans permission écrite. Pour obtenir de plus amples renseignements : http://lois.justice.gc.ca/fr/showtdm/cs/C-42 849Effects of tire -pavement contact pressure distributions on the response of asphalt concrete pavements Zhong Qi Vue and Otto J. Svec Abstract: The paper presents the development of a computer program VIEM for the elastic analysis of multilayered elastic pavements under the action of arbitrary tire-pavement contact pressure distributions. The techniques adapted in VIEM primarily involves the use of a two-dimensional numerical integration to integrate point load solutions over the distributed pressure after discretizing the contact area into a finite number of triangular or quadrilateral elements. Values of contact pressure are inputted at the node points of discretized area. Numerical verification of VIEM indicates that numerical solution of high accuracy caD be efficiently calculated for the elastic response of multilayered asphalt pavements.As a result, the determination of displacements and stresses (strains) can be achieved using a personal computer. With the use of VIEM, a theoretical investigation is further perfonned to illustrate the effects of tire-pavement contact pressure distributions...

/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur.Energy Research, 7, 3, pp. 265-278, 1983 Heat transfer characteristics of in-ground heat exchangers Svec, O. J.; Goodrich, L. E.; Palmer, J. H. L.

This paper presents explicit formulae for the deflection of the surface of an elastic half-space due to a continuous pressure represented by a cubic polynomial distributed over a triangular area.

/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. Research, 11, 4, pp. 573-581, 1987 Potential of ground heat source systems Svec, O. J. International Journal of Energy SUMMARYThis paper presents a historical background of ground source heat pump technology, followed by a review of its current shortcomings. Based on these observations the author assesses the R&D needs and recommendations for future research.

/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. Science and Technology, 16, 3, pp. 271-279, 1989-07-01 A new concept of frost-heave characteristics of soils Svec, O. J. Cold Regions INTRODUCTIONThe classification of soils according to their frostsusceptibility has been used in the design of roads and airfields to minimize damage occurring due to frost action. To determine the frost-susceptibility index to a satisfactory level of confidence, additional freezing tests are often required.Problems with commercial tests stem from requirements that the tests must be simple, of short duration and inexpensive. On the other hand, it is very difficult to handle a complex problem by simple means. In fact, such an approach could often lead to erroneous and misleading results. BACKGROUNDA comprehensive survey of transportation departments throughout the world by Chamberlain ( 198 1 ) revealed that most agencies are using their own unique frost-susceptibility criteria. In addition, freezing tests employed for this purpose are poorly designed and executed; only frost heave or thaw weakening, rather than both, are considered. As a result, the frost-susceptibility index does not represent the actual heaving or thaw-weakening potential, particularly for marginally frost-susceptible soils. Recognizing this problem, Chamberlain (1987), of the Cold Regions Research and Engineering Laboratory (CRREL), developed and proposed a new five-day freezing test. Its main feature, other than improved equipment and data acquisition and control, is that it requires two freeze-thaw cycles and the California Bearing Ratio (CBR) test. The frost-susceptibility index is then defined as the heave rate at the end of the first eight hours of each two-day freeze-thaw cycle. The repetition of the freeze-thaw cycle accounts for the changes in susceptibility to frost heave in frost virgin material. The CBR test, which is performed after the second thaw, yields the thaw-weakening index. The important feature of this new test is that the results of both tests are then used to determine the frost-heave potential. NEEDS AND OBJECTIVESThe drawback of all tests used today is that the thermal boundary conditions are chosen not because they reflect the freezing conditions in the ground as they occur in nature, but rather to provide a convenient testing procedure. For example, the temperature gradient used in the newest CRREL freezing tests is 0.4 "C cm-'. Such high gradients do not occur in nature frequently and, moreover, ...