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    <title>Transport Research International Documentation (TRID)</title>
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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
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    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>Transport Research International Documentation (TRID)</title>
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      <link>https://trid.trb.org/</link>
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    <item>
      <title>THE UPLIFT CAPACITY OF SHALLOW FOUNDATIONS</title>
      <link>https://trid.trb.org/View/121867</link>
      <description><![CDATA[THE RESISTANCE OF SOILS TO UPLIFT LOADS WAS STUDIED AS AN AID TO THE DESIGN OF TRANSMISSION-TOWER FOUNDATIONS. A REVIEW OF PREVIOUS THEORIES AND OF EXPERIENCE WITHIN ONTARIO HYDRO HAD SHOWN A LACK OF ANY GENERALLY ACCEPTED THEORY. SIMPLE MODEL TESTS WERE CARRIED OUT BOTH IN SAND AND IN CLAY, FOR VARIOUS ANCHOR DEPTH-TO-WIDTH RATIOS. IN SAND THE FAILURE MECHANISM WAS FOUND TO BE SIGNIFICANTLY INFLUENCED BY THE SURFACE BOUNDARY AND THE RELATIVE DENSITY OF THE SOIL. IN CLAYS, NEGATIVE PORE-WATER PRESSURES WERE OBSERVED WHICH ACCOUNTED FOR A LARGE REDUCTION IN UPLIFT RESISTANCE UNDER SUSTAINED LOADING. SIMPLE DESIGN RELATIONS BOTH FOR SAND AND FOR CLAY WERE PRODUCED FROM THE MODEL TESTS. VALUES CALCULATED FROM THESE RELATIONS SHOWED REASONABLE AGGREEMENT WITH THE RESULTS OF A NUMBER OF FULL-SCALE TESTS ON AUGERED CONCRETE FOOTINGS. THE RELATIONS HAVE BEEN USEFUL IN ESTIMATING THE UPLIFT CAPACITY OF SUCH FOOTINGS. MORE RIGOROUS SOLUTIONS ARE NEEDED, HOWEVER, TO ENABLE ESTIMATION OF FOOTING MOVEMENTS BOTH UNDER VERTICAL AND UNDER LATERAL LOADS. /AUTHOR/]]></description>
      <pubDate>Sun, 15 Aug 2004 02:41:08 GMT</pubDate>
      <guid>https://trid.trb.org/View/121867</guid>
    </item>
    <item>
      <title>ENGINEERING PROPERTIES OF GLACIAL-LAKE CLAYS NEAR SARNIA, ONTARIO</title>
      <link>https://trid.trb.org/View/121047</link>
      <description><![CDATA[VARIOUS FEATURES OF THE POST-GLACIAL CLAY STRATUM AT THE SITE OF ONTARIO HYDROS LAMBTON GENERATING STATION ALONG THE ST. CLAIR RIVER NEAR SARNIA ARE INTERESTING AND SIGNIFICANT. THESE CLAYS, WHICH ARE UP TO 150 FEET IN THICKNESS, HAVE A COMPLEX PLACEMENT AND SUBSEQUENT LOADING HISTORY, RESULTING IN OVER-CONSOLIDATION AND DESICCATION OF THE UPPER LAYERS. THE INDEX AND STRENGTH PROPERTIES OF THE CLAY VARY BOTH IN ELEVATION AND IN PLAN. GENERALLY THE NATURAL MOISTURE CONTENTS ARE LOWEST IN AREAS COVERED BY A THICK DESICCATED CRUST'  THE CORRESPONDING SHEAR STRENGTHS ARE HIGHEST IN THESE AREAS. THE PLAN VARIATIONS IN ENGINEERING PROPERTIES OF THE SOIL CAN BE RELATED TO THE SURFACE CRUST VARIATIONS WHICH IN TURN ARE BELIEVED TO HAVE RESULTED FROM VARIATIONS THAT EXISTED IN THE VEGETATION COVER DURING THE HISTORY OF THE SITE. CONSIDERABLE SAMPLING DIFFICULTY AT DEPTH WAS EXPERIENCED. FIELD AND LABORATORY TEST DATA ARE PRESENTED IN TYPICAL TREND DIAGRAMS. THE PRACTICAL SIGNIFICANCE OF THE FINDINGS IS DISCUSSED AND ASPECTS REQUIRING MORE DETAILED STUDY ARE INDICATED. BY THIS APPROACH, IN THE OVER-ALL STUDY AND INTERPRETATION OF A LARGE VOLUME OF DATA, SOME ORDER HAS BEEN ASSIGNED TO THE VARIABLES CHARACTERIZING THIS COMPLEX SOIL STRATUM. /AUTHOR/]]></description>
      <pubDate>Sun, 15 Aug 2004 02:37:50 GMT</pubDate>
      <guid>https://trid.trb.org/View/121047</guid>
    </item>
    <item>
      <title>EFFECTS OF AGGREGATES ON SHEAR RESISTANCE OF CONCRETE</title>
      <link>https://trid.trb.org/View/95340</link>
      <description><![CDATA[LABORATORY TESTS ON THREE CONCRETES HAVING DIFFERENT AGGREGATES /CRUSHED STONE, GRAVEL, ILMENITE/ ARE REPORTED. SHEAR STRENGTHS ARE TABULATED AND DIAGRAMS ILLUSTRATE SHEAR FAILURE PATTERNS AND RELATIONS BETWEEN SHEAR STRESS AT FAILURE AND COMPRESSIVE AND TENSILE STRENGTHS. THE LIMITED TEST RESULTS CONFIRMED THAT SHEAR STRESS OF CONCRETE IS PROPORTIONAL TO THE SQUARE ROOT OF THE COMPRESSIVE STRENGTH AND THAT THIS RELATION DEPENDS ON THE TYPE OF AGGREGATE. THE INFLUENCE OF THE AGGREGATE WAS LESS PRONOUNCED IN THE RELATION BETWEEN SHEAR STRESS AND TENSILE STRENGTH. THE INDIRECT TENSILE TEST THEREFORE APPEARS TO BE BETTER THAN THE COMPRESSIVE STRENGTH TEST AS A CRITERION OF SHEAR RESISTANCE. /RRL/]]></description>
      <pubDate>Mon, 12 Dec 1994 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/95340</guid>
    </item>
    <item>
      <title>BACTERIAL CORROSION OF UNDERGROUND METALS</title>
      <link>https://trid.trb.org/View/106546</link>
      <description><![CDATA[AN OCCURENCE OF UNUSUAL UNDERGROUND-METAL CORROSION WAS FOUND, IN WHICH THE SEVERELY CORRODED AREAS OF A STEEL GROUND ROD EXHIBITED A SHINY BLACK COATING CHARACTERISTICS OF FERROUS SULPHIDE. USUALLY, CORROSION OF STEEL IS TYPIFIED BY THE FAMILIAR REDDISH-BROWN COATING OF COMMON RUST. A LABORATORY STUDY REVEALED THAT THE CORROSION SOURCE WAS ANAEROBIC SULPHATE-REDUCING BACTERIA KNOWN AS SPOROVIBRIO DESULPHURICANS. THE LIFE PROCESSES OF SUCH BACTERIA ARE DISCUSSED IN SOME DETAIL, AND THEIR INTERACTION WITH METAL, PARTICULARLY WITH IRON OR STEEL, IN SOILS HAVING CONDITIONS SUITABLE FOR THEIR METABOLISM, IS EXPLAINED. VARIOUS ASPECTS BACTERIAL CORROSION ARE CONSIDERED IN RELATION TO ONTARIO HYDROS INTERESTS IN THE SUBJECT. ALSO, BRIEF MENTION IS MADE OF THE INFLUENCE ON UNDERGROUND CORROSION, OF OTHER BACTERIA TYPES OF LESS CONCERN.]]></description>
      <pubDate>Thu, 28 Jul 1994 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/106546</guid>
    </item>
    <item>
      <title>NEW EQUIPMENT FOR HIGH-PRESSURE TRIAXIAL SHEAR TESTING OF SOIL SAMPLES</title>
      <link>https://trid.trb.org/View/123623</link>
      <description><![CDATA[A NEW HIGH-PRESSURE TRIAXIAL SHEAR TEST SYSTEM, DEVELOPED IN ORDER THAT ESTIMATED STRESSES IN SOIL IN PLACE COULD BE BETTER REPRODUCED IN LABORATORY SPECIMENS, IS DESCRIBED. A BRIEF REVIEW OF THE PRINCIPLE OF THE TRIAXIAL TEST IS FOLLOWED BY A DESCRIPTION OF THE COMPONENTS AND OPERATION OF THE NEW SYSTEM. /AUTH/]]></description>
      <pubDate>Tue, 15 Feb 1994 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/123623</guid>
    </item>
    <item>
      <title>BIOTITE GNEISSES OF THE CANADIAN SHIELD AS COARSE AGGREGATE FOR CONCRETE</title>
      <link>https://trid.trb.org/View/107027</link>
      <description><![CDATA[THE GENERAL CHARACTERISTICS OF GNEISSES AS CONCRETE AGGREGATES ARE DISCUSSED, WITH PARTICULAR ATTENTION TO THE BIOTITE GNEISSES THAT OCCUR IN THE CANADIAN SHIELD OUTSIDE THE GEOLOGICAL GRENVILLE PROVINCE. TESTS INDICATED THAT ALTHOUGH THEIR USE CAN CAUSE SOME PROBLEMS THEY CAN BE GENERALLY SATISFACTORY. /CGRA/]]></description>
      <pubDate>Wed, 02 Feb 1994 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/107027</guid>
    </item>
    <item>
      <title>LOAD TESTING OF PRESTRESSED CONCRETE TRANSMISSION POLE AND ITS CONCRETE FOOTING</title>
      <link>https://trid.trb.org/View/71986</link>
      <description><![CDATA[Full-scale load tests on a centrifugally spun, prestressed concrete pole installed in a reinforced concrete footing indicated that this structure can be used for transmission lines if some dimensional changes are made to increase the torsional capacity of the pole to withstand broken-conductor loading conditions.  The reuslts also showed that the strength and behaviour of the pole can be predicted analytically if the actual dimensions and properties of the materials are known.  Strains in the reinforced concrete footing were very low and, in this case, indicated no need for reinforcing steel to resist stresses due to exterior loading.  Where reinforcement is required for the control of cracks due to temperature and shrinkage, it need be included only in the upper part of the footing.  /Author/]]></description>
      <pubDate>Wed, 26 Apr 1978 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/71986</guid>
    </item>
    <item>
      <title>UPLIFT CAPACITY OF FOOTINGS AND ANCHORS FOR TRANSMISSION TOWERS</title>
      <link>https://trid.trb.org/View/71987</link>
      <description><![CDATA[Research and development by Ontario Hydro as regards the uplift capacity of footings and anchors is reviewed.  The work centered largely on augered concrete footings, and on grouted soil anchors, helix anchors and rock anchors. Approximate theories developed from full-scale tests to evaluate the ultimate uplift capacity of the foundation units are described.  The uplift capacity of footings and anchors in clay was shown to be much lower under sustained loading than under short-term loading, depending on depth. Grouped anchors in clay showed only a slight decrease in efficiency whereas for rock anchors at fairly shallow depth the loss in efficiency was high.  The modes of failure of single and grouped anchors grouted in soft and medium-strength rocks are discussed.  /Author/]]></description>
      <pubDate>Wed, 26 Apr 1978 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/71987</guid>
    </item>
    <item>
      <title>PLANT GROWTH OVER AN UNDERGROUND POWER TRANSMISSION PROTOTYPE</title>
      <link>https://trid.trb.org/View/53694</link>
      <description><![CDATA[Field tests have indicated that common agronomic crops, turf grasses and shrubs can be established in soil heated by Damut--a ducted, air-insulated, high-voltage underground transmission prototype.  During a two-year test period the quality and yield of agronomic crops was lower in heated duct areas than in unheated control areas.  Turf grasses and shrubs appeared to be most tolerant of the heated conditions.  Growth and winter dormancy of shrubs were not affected by the thermal stress. /Author/]]></description>
      <pubDate>Tue, 27 Dec 1977 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/53694</guid>
    </item>
    <item>
      <title>EFFICIENCY IN ENERGY USE</title>
      <link>https://trid.trb.org/View/140614</link>
      <description><![CDATA[This issue of the Ontario Hydro Research Quarterly features an article dealing with the mounting demands on energy and means by which to insure its efficient use.  First it discusses the distribution of energy by source and use, then the efficiency of its consumption in generation of electricity, transportation, space heating, appliances, and industry.  Measures to increase energy conservation are suggested, and conclusions are presented.]]></description>
      <pubDate>Wed, 29 Jan 1975 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/140614</guid>
    </item>
    <item>
      <title>IMPORTANCE OF PETROGRAPHIC IDENTIFICATION OF NATURAL AGGREGATES</title>
      <link>https://trid.trb.org/View/121518</link>
      <description><![CDATA[NATURAL AGGREGATES SHOULD BE PETROGRAPHICALLY IDENTIFIED IN ORDER TO DETERMINE THE ROCKS AND MINERALS PRESENT, TO SINGLE OUT THE HARMFUL CONSTITUTENTS, TO CORRELATE THE AGGREGATE CONSTITUENTS WITH THE STANDARD-ACCEPTANCE-TEST RESULTS USED IN EVALUATION OF THE AGGREGATES, AND TO COMPARE THE AGGREGATES WITH THOSE OF A KNOWN BEHAVIOR. PETROGRAPHIC ASSESSMENT OF AN AGGREGATE IS USUALLY NOT FINAL, BUT IT IS AN ESSENTIAL CONTRIBUTION TO THE EVALUATION. THE FINAL DECISION OF WHETHER OR NOT TO USE A PARTICULAR SOURCE OF AGGREGATE IS MADE ON THE BASIS OF BOTH ACCEPTANCE TESTS AND PETROGRAPHIC EXAMINATION IN ACCORDANCE WITH SPECIFICATIONS FOR THE PARTICULAR STRUCTURE AND ON THE BASIS OF ECONOMIC CONSIDERATIONS. /AUTHOR/]]></description>
      <pubDate>Mon, 23 Nov 1970 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/121518</guid>
    </item>
    <item>
      <title>LOCKING METHODS FOR FITTINGS ON REINFORCING RODS</title>
      <link>https://trid.trb.org/View/97225</link>
      <description><![CDATA[A NEW TYPE HIGH-STRENGTH DEFORMED-STEEL REINFORCING ROD HAS BECOME AVAILABLE UNDER THE TRADE NAME DYWIDAG. THE BAR DEFORMATIONS ARE ROLLED IN SUCH A MANNER THAT THEY CAN BE EMPLOYED AS A THREAD AND EXTEND THE ENTIRE LENGTH OF THE BAR. THE BARS WERE DESIGNED AS A MEANS OF POST-TENSIONING CONCRETE, AND THE BASIC PURPOSE OF THE DEFORMATIONS IS TO PROVICE BONDING. A DEVICE IS REQUIRED FOR LOCKING THE FITTING ONTO THE ROD AT THE DESIRED POINT. LOCKING METHODS TESTED BY ONTARIO HYDRO ARE SUMMARIZED: THREAD STAKING, METAL WEDGES, WIRE WRAPPING, DRIVE SCREWS, LOCK NUT, STEEL DOWEL AND SET SCREW. THE LAST THREE METHODS GIVE GOOD RESULTS, BUT THE SET SCREW HAS THE ADVANTAGE OF BEING EASIER TO MANUFACTURE.]]></description>
      <pubDate>Tue, 21 Jul 1970 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/97225</guid>
    </item>
    <item>
      <title>PERMEABILITY OF CONCRETE TO AIR</title>
      <link>https://trid.trb.org/View/95843</link>
      <description><![CDATA[A PROCEDURE FOR MEASUREMENT OF THE AIR PERMEABILITY OF CONCRETE IS DESCRIBED, AND THE RESULTS OF SEVERAL TESTS ON CONCRETE SPECIMENS AT VARIOUS MOISTURE CONTENTS ARE PRESENTED. THE RESULTS SHOW THAT THE RATES OF AIR FLOW THROUGH THE SPECIMENS WERE MINIMAL, THEREBY ENABLING ECONOMIES TO BE MADE IN THE DESIGN OF THE LARGE VACUUM CONTAINMENT SYSTEM FOR THE NUCLEAR-ELECTRIC PICKERING GENERATING STATION. /LCPC/A/]]></description>
      <pubDate>Tue, 19 May 1970 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/95843</guid>
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