Bridge and Structures

Bridge and Structures

Review of Past MnDOT Barrier Types

Many Minnesota bridges have older barriers or parapets that met the design code at the time of original construction but no longer meet current standards. Document the use of post & beam, type G, type J, and type F barriers on MnDOT bridges. How many years was each used? How many bridges have each type? What is the capacity of each barrier type? Develop guidance and criteria for determining when an existing barrier ...more »

Submitted by (@paul.rowekamp)

Idea Submitted by : MnDOT Bridge Office

List your MnDOT Office,District,City, County, Univ. or Other : MnDOT Bridge Office

Idea Champion - Who at MnDOT/LRRB? : Paul Rowekamp

Project Type - MnDOT or LRRB / Research, Implementation or TRS : Joint MnDOT/LRRB Research

Idea Status (this will be updated by the moderator) : Need Statement #491

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Bridge and Structures

Service Life and Performance Assessment of Bridge Decks with Corrosion-Resistant Reinforcement

MnDOT is in the initial phases of designing and constructing a pair of side-by-side bridges on I-35, one with GFRP and the other with conventional steel deck reinforcement. Because these two bridges will be exposed to the same environmental conditions, very similar traffic, and will be constructed within the same timeframe, a unique opportunity exists to identify and evaluate differences in performance between them. Thus, ...more »

Submitted by (@behrouz.shafei)

Idea Submitted by : Behrouz Shafei and Brent Phares

List your MnDOT Office,District,City, County, Univ. or Other : Iowa State University

Idea Champion - Who at MnDOT/LRRB? : Paul Rowekamp

Why is this a priority and what are the benefits for the State/County/City? :

Degradation of bridge decks is mainly due to the corrosion of steel reinforcing bars embedded in the deck concrete. Considering the significant time and labor investment needed to repair or replace bridge decks prior to the end of their design service life, the outcome of this project is expected to be an important step forward to implement non-conventional, corrosion-resistant reinforcement, which will improve the durability and performance of bridges, while reducing direct maintenance costs. This will also minimize the indirect costs originated from bridge closure, disruption in traffic, and impact on surrounding environment.

Project Type - MnDOT or LRRB / Research, Implementation or TRS : MnDOT Research

Idea Status (this will be updated by the moderator) : Need Statement #498

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Bridge and Structures

Synthesis regarding performance of slipformed barriers and parapets

MnDOT has allowed contractors to use the slipform method of barrier and parapet construction for many years with seemingly good long performance. However, some other surrounding states prohibit the use of slipformed barriers and parapets due to some performance issues, such as local cracks. Water accumulated inside the cracks can cause potential chloride corrosion to the barrier reinforcement. There is also a concern ...more »

Submitted by (@anchen)

Idea Submitted by : An Chen

List your MnDOT Office,District,City, County, Univ. or Other : Iowa State University

Idea Champion - Who at MnDOT/LRRB? : Paul Rowekamp

Why is this a priority and what are the benefits for the State/County/City? :

Barriers and parapets are typically replaced at the same time as the replacement of bridge deck. Premature cracking and failure of the barriers and parapets may require their replacement before the replacement of bridge deck, which incurs additional cost. In addition, barriers and parapets are a critical part of roadway safety. Damaged barriers and parapets can cause safety issue. This study can eliminate potential problems and improve the long-term performance of slipformed barriers and parapets in Minnesota. It has several benefits, including cost savings, increased safety and durability of these structures.

Project Type - MnDOT or LRRB / Research, Implementation or TRS : MnDOT Research

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Bridge and Structures

Low-Cost Portable Device for Welding Quality Monitoring

Welding is commonly used for connecting metal components in these bridges during fabrication and/or construction. Welding processes require high heating input while various factors, such as shrinkage of weld/parent metal or overheating of joint, vulnerably lead to cracks and other defects on the surface. These defects not only could result in severe cracks and corrosion, but also may ultimately lead to malfunction and ...more »

Submitted by (@zhibin)

Idea Submitted by : Drs. Zhibin Lin, Mijia Wang, Jinhui Wang and Na Gong

Idea Champion - Who at MnDOT/LRRB? : Paul Rowekamp, Jihshya Lin

Why is this a priority and what are the benefits for the State/County/City? :

The proposed technology will address the need for an effective and rapid method for timely welding inspection and maintenance of steel bridges in Minnesota State, and introduce an efficient tool for MnDOT that reduces cost, man hours and human risk. Furthermore, the end product may provide practical tools for steel bridge fabricators, construction and in-service welding inspectors, local and state bridge owners in MnDOT to assist in identifying welding quality in critical locations to meet their needs and to assist in decision making.

Project Type - MnDOT or LRRB / Research, Implementation or TRS : MnDOT Research

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Bridge and Structures

Detect nondocumented pile length of sign structures and highmast poles

MnDOT districts have concerns of the pile capacity for some sign structures and high mast poles due to undocumented details of underground piles used. This has caused safety concerns as these structures may fail. As an engineering solution, some districts have adopted the dynamic pile testing methods for detection of actual pile length used, which uses an impact hammer for vibration excitation and a geophone for signal ...more »

Submitted by (@ndsumijia)

Idea Submitted by : Mijia Yang

List your MnDOT Office,District,City, County, Univ. or Other : North Dakota State University

Idea Champion - Who at MnDOT/LRRB? : Paul Rowekamp

Why is this a priority and what are the benefits for the State/County/City? :

Several safety issues have been reported with respect to these sign structures and high mast poles in Duluth regions. The success of this project will ensure the uninterrupted service of these undocumented sign structures and high mast poles.

Project Type - MnDOT or LRRB / Research, Implementation or TRS : MnDOT Research

Idea Status (this will be updated by the moderator) : Need Statement #490

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