Projects

A. Construction, Management and Renewal of Transportation Infrastructure

A.1 Title: Long Term Monitoring of Mechanical Properties of FRP Repair Materials

Sponsor: Colorado Department of Transportation and Mountain-Plains Consortium, USDOT Regional Transportation Center

Description/Objectives: The long term performance of FRP materials in field environments is not well understood. This project consisted of a field component to evaluate the condition of the FRP placed on the Castlewood Canyon Bridge in 2003, and a laboratory component considering the effect of deicing agents on the FRP/concrete bond.

A.2 Title: Quantifying Uncertainty in Nondestructive Bridge Inspection Methods for use in Performance Based Inspection

Sponsor: Mountain-Plains Consortium, USDOT Regional Transportation Center

Description/Objectives: A risk or performance based approach to bridge management would allow for the more efficient allocation of inspection resources and enhanced knowledge about bridge condition. In order to move in this direction it is necessary to characterize the accuracy and reliability of common NDE methods.

A.3 Title: Simple-Made-Continuous Steel Bridge Girders Analytical and Experimental Study

Sponsor: Colorado Department of Transportation and Mountain-Plains Consortium, USDOT Regional Transportation Center

Description/Objectives: Simple-made-continuous construction of steel bridge girders is one means of helping steel compete with pre-stressed concrete as an economical means of bridge construction. The connection of these girders to each other at the pier is critical to the bridge performance. This study considers this connection region both analytically and experimentally.

B. Transportation infrastructure safety and sustainability

B.1 Title: Reliability-based analysis and design loads for slender cable-supported bridges subjected to cable loss

Sponsor: National Science Foundation

Description/Objectives: The project will pursue research in response, safety and reliability of cable supported long-span bridges in case of a sudden loss of one or more cables. The cable loss causes dynamic loads on the bridge which can have catastrophic consequences since cable-stayed bridges depend on cables as the main supporting element. A variety of scenario of cable failure and moving traffic on the bridge will be developed to encompass realistic situations. Non-linear analytical simulation will be developed for limit state situation which will be validated with scale model experiment in wind tunnel. The ultimate goal of the project is to provide consistent reliability to long-span cable supported bridges under various realistic load and accident conditions.

B.2 Title: Performance-based interaction analysis of damage on bridge deck and heavy traffic

Sponsor: Mountain-Plains Consortium, USDOT Regional Transportation Center

Description/Objectives: As an important step toward tackling the accelerating damage problem of bridge deck and expansion joints, the objective of this study would be to characterize the basic interactions between the passing traffic and the deteriorating joints by developing a rational model.

B.3 Title: Investigation of optimal seismic design of typical bridges in Colorado

Sponsor: Colorado Department of Transportation

Description/Objectives: This study looks into the seismic design issues of vulnerable bridges, such as curved and skewed bridges in moderate seismic zone like Colorado. Some design practices are assessed and recommendations will be made.

B.4 Title: Reliability-based analysis and design loads for slender long-span bridges

Sponsor: National Science Foundation

Description/objectives: This study develops (1) advanced stochastic traffic load simulation on long-span bridges; (2) experimental wind tunnel test of bridge decks with traffic; and (3) simulation methodology of slender long-span bridges subjected to wind and stochastic traffic flow based on reliability theory. The lifetime performance of critical slender long-span bridges can be assessed and some important findings are made toward future design loads for slender long-span bridges, which are not available.

B.5 Title: Seismic vulnerability analysis of bridges in mountainous states

Sponsor: Mountain-Plains Consortium, USDOT Regional Transportation Center

Description/objectives: This project investigates the vulnerability of a typical highway bridge in mountainous state subjected to seismic and other hazardous conditions. Complex bridge modeling and multi-hazard study will be carried out.

B.6 Title: Feasibility study of mobile scanning technology for fast damage detection of rural bridge using wireless sensors

Sponsor: Mountain-Plains Consortium, USDOT Regional Transportation Center

Description/objectives: This study looked into the feasibility of conducting fast damage detection with mobile sensors. Both simulation and preliminary experimental work have been conducted.

B.7 Title: Seismic Behavior of Steel Bridges with Fatigue-prone Details

Sponsor: Mountain-Plains Consortium, USDOT Regional Transportation Center

Description/objectives: The study included an analytical assessment of low and ultra-low cycle fatigue life of steel bridge details when subjected to earthquake events. The outcome of the study is the development of practical guidelines for retrofitting existing fatigue prone details to withstand seismic demand.

B.8 Title: Fatigue Strength of CFRP-repaired Reinforced Concrete Bridge Girders under Service Temperature

Sponsor: Mountain-Plains Consortium, USDOT Regional Transportation Center

Description/objectives: The project focused on assessing fatigue crack growth in the reinforcements and the concrete in RC girders as influenced by temperature and axle loads. The work is conducted through experimental and numerical simulations and is aimed for evaluating the effectiveness of CFRP repair on slowing down the propagation rate of the cracked girders as a function of the applied axle load and temperature load.

B.9 Title: Seismic Behavior of Highway Embankments

Sponsor: Mountain-Plains Consortium, USDOT Regional Transportation Center

Description/objectives: The project developed an approach for assessing the performance of embankments under seismic loads. Observed failures in highway embankments are highlighted through finite element simulations of highway embankments. The results of the analysis are compared against specific performance levels.

C. Traffic safety in adverse driving conditions

C.1 Title: Investigation of interactions between traffic law enforcement, crash and driving behavior on rural highways in Colorado

Sponsor: Mountain-Plains Consortium, USDOT Regional Transportation Center

Description/objectives: This project studies the interactions between traffic crashes, law enforcement practices and associated driving behavior change.

C.2 Title: Investigation of traffic crash, injury and law enforcement on Colorado highways

Sponsor: Colorado State Patrol

Description/objectives: This project conducts comprehensive investigation of historical traffic crash and injury across highways in Colorado. Advanced refined-scale traffic crash prediction models will be developed.

C.3 Title: GIS-based rollover crash risk map of large trucks on I-70 mountain corridor

Sponsor: Mountain & Plain Education and Research Center, ERC of CDC NIOSH

Description/objectives: Rollover risk of typical trucks on I-70 has been investigated under various adverse driving conditions. The GIS-based interactive map is developed and demonstrated to reflect the varying risk under different conditions.

C.4 Title: Reliability-based safety risk and cost prediction of large trucks on rural highways

Sponsor: Mountain-Plains Consortium, USDOT Regional Transportation Center

Description/objectives: Reliability-based safety risk model for trucks has been developed based on simulation-based model.

C.5 Title: Investigation of speed limits on the I-70 mountain corridor in Colorado

Sponsor: Colorado Department of Transportation

Description/objectives: This study evaluated the current variable speed limits for trucks on I-70 from both traffic safety and efficiency perspectives.

C.6 Title: Risk-based advisory prevention system for commercial trucks and hazardous conditions

Sponsor: Mountain-Plains Consortium, USDOT Regional Transportation Center

Description/objectives: This study investigates appropriate advisory driving speeds for large trucks subjected to different adverse driving conditions in order to maintain acceptable safety risk. This study is based on the reliability-based traffic safety model developed by the same group of researchers.

C.7 Title: Traffic safety vulnerability information platform (TS-VIP) for highways in mountainous areas using geospatial multimedia technology

Sponsor: Mountain-Plains Consortium, USDOT Regional Transportation Center

Description/objectives: This project developed a new driving information collection technique using mobile sensors and GPS-guided multimedia techniques with a test vehicle. The validity of the approach and also the accuracy of the data have been evaluated using field test and also wind tunnel laboratory test.