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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>A Direct Design Method of Hybrid High Strength Steel Web Tapered Members</title>
      <link>https://rip.trb.org/View/1890628</link>
      <description><![CDATA[The objectives of the present project are to investigate the ductility and ultimate strength of HSS hybrid web-tapered members subjected to bending and combined bending and axial compression to propose a direct design method based on slenderness. An experimentally verified numerical model will be developed and nonlinear buckling analysis will be conducted. Four (4) different high 
strength steel grades ranging from 690 to 1100 MPA will be employed to study the buckling behavior and rotation capacity of members with various local and overall slenderness ratios. A comprehensive parametric study consists of 450 models will be generated based on the most influential design variables and correlation between the parameters will be presented.
]]></description>
      <pubDate>Mon, 08 Nov 2021 15:05:34 GMT</pubDate>
      <guid>https://rip.trb.org/View/1890628</guid>
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      <title>Performance of Fiber-Reinforced Self-Consolidating Concrete for Repair of Bridge Sub-Structures and Fiber-Reinforced Super-Workable Concrete for Infrastructure Construction</title>
      <link>https://rip.trb.org/View/1402199</link>
      <description><![CDATA[The proposed study seeks to investigate key engineering and structural properties of fiber-reinforced self-consolidating concrete (FR-SCC) and fiber-reinforced super workable concrete (FR-SWC) for infrastructure repair and construction. FR-SCC is targeted for repair of sub-structure elements, while the FR-SWC is targeted for construction operations. The FR-SWC requires some consolidation and can be used in less congested structural elements where this consolidation with SCC or FR-SCC is not required. The FR-SWC is easier to produce than FR-SCC and is more cost-effective for use in infrastructure construction. However, the FR-SWC is not adequate for repair applications that often involve casting concrete in restricted spacing necessitating self-consolidation characteristics. FR-SWC can be used in precast as well as cast-in-place girders, cast-in-place piers and piles, and other bridge elements, including abutment walls.  In this investigation, several types of fibers will be investigated to select FR-SCC and FR-SWC that can yield superior performance. The expected result from this study will be guidelines and performance-based specifications for the evaluation, selection, and specification of FR-SCC for infrastructure repair of bridge sub-structures and FR-SWC for the construction of bridge substructure and superstructure elements.]]></description>
      <pubDate>Wed, 30 Mar 2016 01:00:24 GMT</pubDate>
      <guid>https://rip.trb.org/View/1402199</guid>
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      <title>Evaluation of the Orientation of 90° and 180° Reinforcing Bar Hooks in Wide Members</title>
      <link>https://rip.trb.org/View/1234470</link>
      <description><![CDATA[Longitudinal reinforcing steel in concrete flexural elements is often developed at the end of a concrete member by a 90° or 180° standard hook that is usually oriented such that the hook is in the vertical direction. In some instances, such as the case of a shallow member that is heavily-reinforced with reinforcing bars of large diameter, the standard hook height in plus concrete cover above and below the bar may exceed the thickness of the concrete member. To address this issue, sometimes it is suggested that the hook may tilted from vertical to maintain the required clear cover. The limits of this tilt, however, are not defined or known. To address this issue, the overall goal of the proposed project is to study the influence of tilt angle on the development of standard reinforcing bar hooks and determine determine the limits of reinforcing steel hook tilt, if any, so ultimate performance of the member is not compromised. Design recommendations developed as part of this study will provide clarification to engineers and building code officials regarding limits of tilt of hooked reinforcing bars so that the original intent of hooked bar development is met.]]></description>
      <pubDate>Thu, 03 Jan 2013 15:12:59 GMT</pubDate>
      <guid>https://rip.trb.org/View/1234470</guid>
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      <title>Design of FRP Systems for Strengthening Concrete Girders in Shear: Phase I</title>
      <link>https://rip.trb.org/View/1231035</link>
      <description><![CDATA[FRP systems have been used on a project-specific basis for the last two decades. They are now becoming a widely accepted method of strengthening concrete structures. The acceptance and utilization of these new strengthening techniques depend on the availability of clear design guidelines, installation procedures and construction specifications. Standard specifications exist for all commonly used traditional materials in civil engineering structures. At this time, design specifications for FRP use are still under development. The results of several experimental investigations have shown that FRP systems can be effective for increasing ductility and strength to structural members such as columns and girders. As most of the research focused on strengthening of axial members of flexural members, there are less experimental and analytical data on the use of FRP systems for shear strengthening of girders. Shear strengthening with FRP is still under investigation and the results obtained thus far are scarce and sometimes controversial. Even in traditional reinforced concrete members without FRP, the shear design is a complex challenge and uses more empirical methods as compared to axial and flexural design methods. Adding FRP to the equation, with its specific design issues, would bring another level of complication in the design. These FRP-related shear design issues and lack of comprehensive analytical and experimental models are the main motivation for this research project. Thus, a thorough understanding of the shear design problem along with the development of an AASHTO design method for FRP shear strengthening of concrete girders are needed. As such, the objective of this project is to develop design methods, specifications, and examples for design of FRP systems for strengthening concrete girders in shear. The proposed specifications will be in LRFD format and will be suitable for recommendation to the AASHTO Highway Subcommittee on Bridges and Structures for adoption.]]></description>
      <pubDate>Thu, 03 Jan 2013 14:10:53 GMT</pubDate>
      <guid>https://rip.trb.org/View/1231035</guid>
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