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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>Research in Progress (RIP)</title>
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      <title>SEAHIVE® solutions to mitigate bridge scour – Phase II</title>
      <link>https://rip.trb.org/View/2422950</link>
      <description><![CDATA[This one-year proposal is for Phase II of the three-phase project conducted in partnership with Texas State University. Specifically, this study will investigate the performance of the SEAHIVE® system in mitigating bridge scour. SEAHIVE® is a modular engineered protection system composed of concrete perforated hexagonal prisms. Perforations on the side faces of the elements provide passage for water flow dissipating the energy within the system while also adding structural complexity which improves its potential for habitat creation.
This Phase II will focus on the production of internally prestressed units using conventional precast beds currently available for producing 30-inch square piles. Using this technique, it will be possible to increase production efficiency and, as importantly, manufacture units of lengths up to 24 ft. that could be necessary for scouring applications in marine and riverine environments. The units produced with this technology will be fully characterized and their behavior compared to others produced by wet-cast (no prestressing) and externally- prestressed. This latter objective will be accomplished through laboratory testing in compression and bending of units designed aiming to the same structural performance.
In order to guarantee the durability of the precast elements subjected to harsh wet-and-dry conditions, the prestressing tendons will be made of #3 (3/8 in.-diameter) glass fiber reinforced polymer (GFRP) bars shipped to the precast plant in coils. In fact, no steel reinforcement will be used to avoid corrosion. The anchors for tensioning will be conventionally split-wedges and sleeves used for 0.375 in. seven-wire steel strands. It is expected that these units will perform in flexure as partially prestressed longitudinal members. In addition to being cost-effective, this method of construction also enables greater distress to be observed for load conditions above the Service Limit State through the prevalence of transverse cracking without any concerns for corrosion due to the inert prestressing tendons.
The project has the potential to create a consortium-wide effort for implementing the SEAHIVE® system into practice providing a novel efficient and ecofriendly solution for scour mitigation in bridge foundations.
]]></description>
      <pubDate>Thu, 29 Aug 2024 17:14:29 GMT</pubDate>
      <guid>https://rip.trb.org/View/2422950</guid>
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      <title>Role Of Grout And GFRP Slip Liner On The Circumferential Behaviour Of Retrofitted Corroded Metal Culverts </title>
      <link>https://rip.trb.org/View/2404267</link>
      <description><![CDATA[For any aging infrastructure, its probability of failure increases with time. There are a multitude of ways to repair and rehabilitate deteriorating pipes, and as the infrastructure system continues to age, it is important to understand and promote the use of effective and durable materials for retrofit. Fiber reinforced polymer (FRP) composites have shown to offer an attractive alternative to replace the deteriorating steel in structural corrugated metal pipes (CMPs). FRP composites have significantly improved durability characteristics compared to steel, which will reduce maintenance costs and improve lifecycle costs. Other materials such as HDPE slip liners for retrofit are in existence but their durability and improvement to load carrying capacities is under question. Past experimental work has shown GFRP to be a suitable material for developing composite action with corroded steel using a polymer grout. Longitudinal testing of corroded CMP with glass fiber reinforced polymer (GFRP) slip liners has garnered interest of the New Mexico DOT. However, field conditions are more circumferential dominant behaviors, and no data exist on this performance measure for CMPs with GFRP slip liners. The proposed work will help evaluate the parameters obtained from circumferential bending necessary to develop design for field implementation using GFRP slip liners with different grouts for corroded culvert retrofit. ]]></description>
      <pubDate>Sun, 21 Jul 2024 14:59:54 GMT</pubDate>
      <guid>https://rip.trb.org/View/2404267</guid>
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      <title>Impact Test of GFRP Reinforced Concrete Bridge Barriers</title>
      <link>https://rip.trb.org/View/1945929</link>
      <description><![CDATA[The aim of this proposal is to provide test and evaluation of glass fiber reinforced polymer (GFRP) bars for concrete bridge barriers. The “steel-free” concrete bridge structure concepts have gained wider acceptance in current practice due to reduced material cost and validated field performance from the past research. However, on-site bending is still not possible for GFRP bars, which causes increase in the number of GFRP bars used in construction. Alternatively, headed end GFRP bars may address this problem. Existing research has conducted that both experimental and numerical modeling investigations to achieve an optimum design for GFRP reinforcement in concrete structures, especially railings. It was suggested that the headed-end GFRP bars can provide sufficient resistance, however, with an added cost. Therefore, anchorage GFRP bars with modified bending radius has also been suggested to achieve same resistance with lower cost. Considering the on-going effort in seeking the optimized GFRP configurations for concrete bridge railings, the preliminary design and validation is critical in finding the best design prior to the field implementation of GFRP bars for concrete bridge railings in the state of Missouri.

The research team from Missouri S&T along with industrial partners and Missouri Department of Transportation (MoDOT) engineers has an on-going research project on the preliminary design and numerical evaluation of the GFRP reinforced concrete barriers. From the preliminary findings, the two-piece GFRP designs were selected and moved into numerical investigation stage. The preliminary numerical results indicate the existing design can withstand the Manual for Assessing Safety Hardware (MASH) specifications. However, the dynamic impact test is needed for validation. Considering the high cost in full-scale vehicle impact test, the team is considering alternative testing method which has significantly higher cost-effectiveness. The pendulum impact test is proposed for this MATC proposal.]]></description>
      <pubDate>Sat, 30 Apr 2022 11:44:56 GMT</pubDate>
      <guid>https://rip.trb.org/View/1945929</guid>
    </item>
    <item>
      <title>Design and Numerical Evaluation of GFRP Reinforcement for Concrete Bridge Railing</title>
      <link>https://rip.trb.org/View/1762372</link>
      <description><![CDATA[The aim of this proposal is to provide design and numerical evaluation of glass fiber reinforced polymer (GFRP) bars for concrete bridge railing. The “steel-free” concrete bridge structure concepts have gained wider acceptance in current practice due to reduced material cost and validated field performance from the past researches. However, on-site bending is still not possible for GFRP bars, which causes increase in the number of GFRP bars used in construction. Alternatively, headed end GFRP bars may address this problem. Existing researches have conducted both experimental and numerical modeling investigations to achieve an optimum design for GFRP reinforcement in concrete structures, especially railings. It was suggested that the headed-end GFRP bars can provide sufficient resistance, however, with an added cost. Therefore, anchorage GFRP bars with modified bending radius has also been suggested to achieve same resistance with lower cost. Considering the on-going effort in seeking the optimized GFRP configurations for concrete bridge railings, the preliminary design and numerical validation is critical in finding the best design prior to the field implementation of GFRP bars for concrete bridge railings in the state of Missouri.]]></description>
      <pubDate>Thu, 07 Jan 2021 14:02:10 GMT</pubDate>
      <guid>https://rip.trb.org/View/1762372</guid>
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