Research in Progress (RIP) https://rip.trb.org/ en-us Copyright © 2026. National Academy of Sciences. All rights reserved. http://blogs.law.harvard.edu/tech/rss tris-trb@nas.edu (Bill McLeod) tris-trb@nas.edu (Bill McLeod) Research in Progress (RIP) https://rip.trb.org/Images/PageHeader-wTitle-RIP.jpg https://rip.trb.org/ Development and Evaluation of Approach Guardrail Transition with Increased Span Length between Concrete bridge Rail and First Transition Post - Phase II https://rip.trb.org/View/2689395 Tue, 02 Jun 2026 12:25:41 GMT https://rip.trb.org/View/2689395 Ultra-high performance concrete composite decks for long-span coastal bridges (OSU) https://rip.trb.org/View/2663233 Sat, 31 Jan 2026 12:05:58 GMT https://rip.trb.org/View/2663233 Load Rating and Posting of Long-Span Bridges https://rip.trb.org/View/2296638 200 feet. Long-span bridges get special engineering analysis in the design phase, but methods for evaluating them in service are limited. To ensure public safety while sustaining commerce and preserving vital infrastructure, methods for rational load rating, permitting, and posting are essential. Research is needed to help state departments of transportation evaluate their long-span bridges. The objective of this research is to develop procedures for load rating, posting, and permitting of highway bridges with spans greater than 200 feet in length. It shall consider all applicable load effects.]]> Mon, 27 Nov 2023 19:28:48 GMT https://rip.trb.org/View/2296638 Developing Prestressed Concrete Girder Cross-Sections for Longer Spans and New Materials https://rip.trb.org/View/2221102 Sun, 30 Jul 2023 21:12:04 GMT https://rip.trb.org/View/2221102 Impact of Response Spectra Definitions and Direct Displacement-Based Design Simplification for Multi-Span Bridges https://rip.trb.org/View/1890614 Mon, 08 Nov 2021 13:49:07 GMT https://rip.trb.org/View/1890614 Wind Turbulence-Structure Interaction and Aeroelastic Instability for Long-Span Flexible Girder Systems https://rip.trb.org/View/1877211 Wed, 08 Sep 2021 17:17:36 GMT https://rip.trb.org/View/1877211 SPR-4431: A New Approach to Accelerated Fabrication of Steel Bridges: Design, Optimization, and Demonstration https://rip.trb.org/View/1646238 Fri, 16 Aug 2019 09:41:02 GMT https://rip.trb.org/View/1646238 Achieving Resilient Multi-Span Bridges by using Buckling-Restrained Braces https://rip.trb.org/View/1599222 Tue, 09 Apr 2019 10:38:44 GMT https://rip.trb.org/View/1599222 Pre-stressed Losses in Decked Bulb-tee Girders https://rip.trb.org/View/1466349 Thu, 04 May 2017 15:42:06 GMT https://rip.trb.org/View/1466349 Development of Validated Methods for Soil-Structure Interaction Analysis of Buried Structures https://rip.trb.org/View/1441854 Wed, 04 Jan 2017 10:54:37 GMT https://rip.trb.org/View/1441854 Use of 0.7-in. Diameter Strands in Precast Pretensioned Girders https://rip.trb.org/View/1364284 Thu, 06 Aug 2015 01:00:22 GMT https://rip.trb.org/View/1364284 Development of In-Service Monitoring Tools for Long-Span Bridges Using Advanced Sensor Networks https://rip.trb.org/View/1258892 Wed, 14 Aug 2013 01:01:03 GMT https://rip.trb.org/View/1258892 Performance Based Detailing for Bridge Columns https://rip.trb.org/View/1228384 Thu, 03 Jan 2013 13:20:01 GMT https://rip.trb.org/View/1228384