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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>
    <docs>http://blogs.law.harvard.edu/tech/rss</docs>
    <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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      <title>Experimental study on monotonic and fatigue behaviour of polypropylene fibre-reinforced roller-compacted concrete with fly ash</title>
      <link>https://trid.trb.org/View/1605608</link>
      <description><![CDATA[This study investigates the monotonic and fatigue behaviour of triangular polypropylene fibre (TPF)-reinforced roller-compacted concrete (ROCC) with fly ash. An experimental programme to investigate the response of square model slabs was tested for static loading at the centre, edge and corner on two types of modulus of subgrade reaction. The TPF used was 0.25%, 0.50% and 0.75% with 15%, 30% and 45% FA per 1 m3 of ROCC. Embedded strain gauge in slab and deflection profile measurement showed that fibres assisted crack bridging, cracks resistance and load redistribution and were compared with FEM analysis. The fatigue studies were carried out to get the fatigue life and energy consumed for fibre-reinforced ROCC with different stress ratios. The fatigue failures of concrete roads due to repetitive loading are smaller than the loads that can cause failure in a single application. The result shows that the ideal amount of TPF and fly ash (FA) has enhanced the collapsible load of slabs, fatigue life, flexural and tensile strength of ROCC for pavements.]]></description>
      <pubDate>Tue, 21 May 2019 11:06:25 GMT</pubDate>
      <guid>https://trid.trb.org/View/1605608</guid>
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    <item>
      <title>Intelligent Decision Aiding in Transportation and Logistics</title>
      <link>https://trid.trb.org/View/1133793</link>
      <description><![CDATA[Decision aiding in transportation and logistics usually concerns a set of alternatives (solutions, options, actions, etc.) evaluated from multiple points of view considered relevant by a Decision Maker (DM). The aim is to select a subset of best alternatives or to rank alternatives from the best to the worst. As the points of view, called criteria, are usually in conflict, the only objective information that stems from the decision problem formulation is a dominance relation in the set of alternatives (alternative a dominates alternative b if a is at least as good as b on all considered criteria). While dominance relation permits to eliminate many irrelevant (i.e. dominated) alternatives, it does not compare completely all of them, resulting in a situation where many alternatives remain incomparable. This situation may be addressed by taking into account preferences of a DM. This paper will focus on decision aiding methods based on intelligent construction of DM’s preferences. Comparing to traditional decision aiding methods, intelligent decision aiding does not require from the DM a difficult to elicit preference information, like exhaustive pairwise comparisons, criteria weights or trade-offs, but it constructs the DM’s preference model from decision examples. As model building from decision examples is typical for Artificial Intelligence, the author calls this approach intelligent decision aiding. In case of choice and ranking, decision examples provided by a DM have the form of pairwise comparison of selected alternatives. A preference model should be able to reconstruct the provided pairwise comparisons. In general, the model construction follows logical induction. In case of real function models, this induction translates into ordinal regression. This paper will show construction techniques for three kinds of preference models: a set of value (utility) functions, a set of outranking relations, and a set of “if…, then…” monotonic decision rules. An important feature of all these techniques is identification of all instances of the preference model that are compatible with (i.e. reconstruct) the input preference information – this permits to draw robust conclusions regarding DM’s preferences when any of these models is applied on the whole set of considered alternatives. Finally, the paper will show how these construction techniques can be applied to real world problems from the area of transportation, where alternatives are evaluated on subsets of criteria structured into technical, functional and strategic levels.]]></description>
      <pubDate>Tue, 20 Mar 2012 12:16:41 GMT</pubDate>
      <guid>https://trid.trb.org/View/1133793</guid>
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    <item>
      <title>Non Monotonicity of Path Travel Time in Dynamic Traffic Assignment: Implications for Solution Existence and Practical Algorithms</title>
      <link>https://trid.trb.org/View/911417</link>
      <description><![CDATA[As dynamic traffic assignment tools and applications become more widespread, it is important to better understand the mathematical properties of these models and the implications for solution methods and their real-world application.  Existence of an interior equilibrium solution to dynamic assignment problems and convergence to such a solution has been predicated on the assumption of the monotonicity of the path travel time function—considered to be a mild assumption though not formally challenged or tested in the literature.  This paper shows that most realistic representations of traffic dynamics in a traffic assignment model are likely to result in violations of the monotonicity assumption.  This is done first through a simple example in an idealized network, intended to show the traffic mechanism that leads to such violations in a general network.   Next, numerical experiments are conducted on three real world networks.  The study shows that non monotonicity of path travel time is quite likely in realistic models of general urban networks.   Implications for algorithm development and practical application are discussed.]]></description>
      <pubDate>Fri, 23 Apr 2010 08:26:49 GMT</pubDate>
      <guid>https://trid.trb.org/View/911417</guid>
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    <item>
      <title>A Revised Methodology to Minimize Bias in Determining the Porosity and Void Tensor of Particulate Media</title>
      <link>https://trid.trb.org/View/815021</link>
      <description><![CDATA[Increased recognition of the importance of fabric in the observed response particulate media under monotonic and cyclic loading has led to the development of new procedures to quantify this role. This paper will review an experimental based methodology that uses classical sterology principles to experimentally determine the porosity and void tensor from microscopic observations. These quantities can then be used, for example, in constitutive relationships that attempt to predict material behavior. The potential for measurement bias with the current methodology is illustrated and a revised technique involving the subtraction of images while considering the representative element circle concept is presented. Measurements with the existing and proposed methodologies are compared.]]></description>
      <pubDate>Mon, 27 Aug 2007 07:42:24 GMT</pubDate>
      <guid>https://trid.trb.org/View/815021</guid>
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    <item>
      <title>Analytical Performance of Reinforced Concrete Columns using Various Confinement Models</title>
      <link>https://trid.trb.org/View/795946</link>
      <description><![CDATA[Accuracy of various stress-strain relationship models for concrete confined by lateral steel reinforcement in prediction of the moment-curvature response of a section under various loading patterns was investigated.  Fiber model was implemented in a computer program developed for flexural analysis of reinforced concrete columns.  Both monotonic and hysteretic analysis were performed.  Each confined concrete model was used in the analysis for several loading cases on a circular, and a loading case on a rectangular section, keeping all other parameters fixed.  Results were compared to each other and also validated against experimental data from six large-scale reinforced concrete circular columns and a rectangular section tested under the analyzed loading cases.  In general, analysis underestimated the moment and overestimated the curvature capacities under a high level of axial load regardless of the model used, and there was a better agreement between analysis and test for low level or no axial load.  Results from various models were close to each other, though different from test results, for cases with a constant or proportionally variable axial load.  For a monotonic curvature with non-proportionally variable axial load, predictions by some recent models had a better agreement with experimental data.  Evidently the level of axial load, and in turn the depth of compression zone, is related to the degree of confinement-utilization, and affects the confined concrete behavior.  This is rarely addressed by the models.]]></description>
      <pubDate>Tue, 30 Jan 2007 13:29:21 GMT</pubDate>
      <guid>https://trid.trb.org/View/795946</guid>
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    <item>
      <title>UNBONDED POSTTENSIONED CONCRETE BRIDGE PIERS. I: MONOTONIC AND CYCLIC ANALYSES</title>
      <link>https://trid.trb.org/View/734594</link>
      <description><![CDATA[The monotonic and cyclic behavior of a proposed unbonded, posttensioned concrete bridge pier system is studied using finite-element analyses. A procedure to evaluate seismic capacities based on results from the monotonic and cyclic analyses is described in the framework of a two-level approach considering functional- and survival-performance limits. A set of criteria to define functional- and survival-level displacement capacities for the system is developed. The proposed criteria represent improvements over existing criteria in that they are applicable to both conventional reinforced concrete structures and unbonded posttensioned structures. The monotonic and cyclic behavior of prototype single-column pier and two-column bent designs is presented. Monotonic analyses are performed to characterize the stiffness, strength, ductility, and limit-state behavior of these systems. Cyclic analyses are carried out to estimate energy dissipation capacity, residual displacements, and general hysteretic behavior. The influence of the degree of unbonded posttensioning on bridge pier behavior is examined. Using the finite-element results and the proposed criteria, seismic capacities of the prototype bridge pier systems are established.]]></description>
      <pubDate>Wed, 05 Mar 2003 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/734594</guid>
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