UNR Research Projects

On-Going Projects

3rd-Cycle Projects (2016-grant)

  • Quantitative Assessment of Soil-Structure Interaction Effects on Seismic Performance of Bridges with ABC Connections [ABC-UTC-2016-C3-UNR01]: In this project, we propose a quantitative assessment of soil-structure interaction effects on seismic performance of bridges with accelerated bridge construction (ABC) connections. To define the project testbed, we use the outcome of a recently completed ABC-UTC project on a two-span bridge system with six ABC connection types.
  • Investigating the Potential Applications of Elastomeric Polymers (such as Polyuria And Polyurethane) for Accelerated Bridge Construction and Retrofit [ABC-UTC-2016-C3-UNR02]: This project takes the first step of a long-term research vision to examine and investigate the innovative applications of elastomeric polymers and specifically polyurea coating in accelerated bridge construction. This project focuses on the flexural and shear strength of polyurea coated RC beams. This simple step is taken to start gaining experience and knowledge on this relatively new material, and incrementally examine other aspects of the applications and other potential applications through future efforts.
  • Application of Methacrylate Polymers for Seismic ABC Connections [ABC-UTC-2016-C3-UNR03]: Previous research has demonstrated the validity and effectiveness of grouted ducts filled with proprietary and non-proprietary UHPC for seismic ABC column-to-footing and column-to-cap beam connections. However, there is a need for more alternatives in case of temporary market changes such as domestic steel fibers availability as related to UHPC. Polymer-based materials can provide a good candidate for this application. This project will explore polymer-based alternatives for grouted ducts connections and provide large-scale validation testing.

2nd-Cycle Projects (2016-grant)

1st-Cycle Projects (2016-grant)

Completed Projects

3rd-Cycle Projects (2013-grant)

  • Durable UHPC Columns with High-Strength Steel [ABC-UTC-2013-C3-UNR01]: This study aims at providing the basic knowledge needed to optimize the design of full prefabricated bridge columns using UHPC and high-strength steel under combined axial and lateral loading. Large-scale tests will be conducted to verify the seismic performance of the novel UHPC columns.
  • Analytical Investigations and Design Implications of Seismic Response of a Two-Span ABC Bridge System [ABC-UTC-2013-C3-UNR02]: Extensive computer simulation of the seismic behavior of a 2-span bridge model is conducted to first determine the analytical modeling method that best replicates the shake test results.  The model is then utilized to determine important parameters and develop ABC seismic design guidelines based on the findings.

2nd-Cycle Projects (2013-grant)

  • Shake Table Studies of a Bridge System with ABC Connections [ABC-UTC-2013-C2-UNR01]:  ABC connections for prefabricated members are particularly critical in moderate and high seismic zones because earthquake forces place high demand on inelastic deformation of adjoining columns. Structural integrity of the bridge has to be maintained by capacity-protected connections that experience little or no damage. The overall objective of the proposed study is to investigate the seismic performance of a large-scale bridge system that integrates some of the more promising ABC connections that have been proof tested as individual components.

1st-Cycle Projects (2013-grant)

  • Evaluation of Seismic Performance of Bridge Columns with Couplers and Development of Design Guidelines [ABC-UTC-2013-C1-UNR01]: The overall objective of this study was to compile and interpret data on seismic performance of different types of couplers and establish characteristic column plastic hinge behavior for different coupler types. The study further categorized the couplers with respect to their seismic performance. The results of the study were transformed into draft design guidelines for possible adoption by AASHTO.
  • Behavior and Design of Precast Bridge Cap Beams with Pocket Connections [ABC-UTC-2013-C1-UNR02]: The main objective of this study was to compile and interpret data on seismic performance of cap beams with pocket connections and identify behavior, design, detailing, and construction considerations for successful implementation of this category of connections. The results of the study were transformed into design guidelines for possible adoption by AASHTO.
  • Development and Seismic Evaluation of Pier Systems with Pocket Connections and UHPC Columns [ABC-UTC-2013-C1-UNR03]: The overall objective of this study was to develop and evaluate resilient bridge piers consisting of prefabricated columns and cap beams subjected to simulated earthquake loading on shake tables. The post-earthquake damage is minimized by using prestressing CFRP tendons to control residual displacements and plastic hinge damage by using ECC and UHPC.