VMT for Air Quality Purposes
This paper addresses VMT as one of the important parameters in air quality analysis. It covers three main topics: (1) The context in which VMT should be viewed as one parameter for measuring...
Generating Detailed Emissions Forecasts Using Regional Transportation Models: Current Capabilities and Issues
Mobile source emission estimates have long been calculated using composite emission factors (expressed as grams of emissions per mile) and estimates of vehicle-miles travelled. Techniques...
Laboratory Tests of Modal Emissions and Off-Cycle Corrections to FTP-75
The modeling of emissions from on-road mobile sources is an on-going process. Two broad topics which are currently under study are the evaluation of driving cycles and the development...
In-Use Emissions with Today's Closed-Loop Systems
Closed-loop emission control systems were adopted by most motor vehicle manufacturers on a wide-spread basis in model year 1981, in order to meet the 1981 and later Federal exhaust emission...
Characteristics of MOBILE4 and EMFAC7E Models
Several recent studies (e.g., Lawson et al., 1990; Ingalls, 1989) have indicated that the EPA and ARB vehicle emission factor models MOBILE4 and EMFAC7E underpredict in-use vehicle emission...
Controlled Braking on Uneven Roads
The braking process of a passenger car may be influenced by a large number of variables relating to driver, vehicle, brake system, tire-road interaction and ambient conditions. Because...
Truck Loading Data for a Probabilistic Bridge Live Load Model
The University of Colorado at Boulder completed a major bridge testing and analysis program for the Federal Highway Administration (FHWA). According to FHWA, this study has produced the...
Soil/Structure Seismic Investigation of Safety-Related Structures
This paper promotes an improved understanding of the type of earthquake motions felt at V.C. Summery, Perry and Krsko nuclear power plants. An analytical investigation is performed to...
Bridge Overloading Criteria
Considerable concern is being expressed by the public and government agencies over the deteriorating state of the country's infrastructure. At the same time, there is a general feedling...
Live Load Models Based on WIM Data
The objective of the paper is to present the results of weigh-in-motion (WIM) measurements carried out in Michigan. Selected bridges were instrumented and truck weights and axle configurations...
Road and Airport Pavement Response Monitoring Systems
This proceedings,
Expert Systems: Ready to Hit the Road?
Expert systems, programs that take the rules a person uses to solve a problem and encodes them into a computer, are starting to get serious examination from DOTs around the country. The...
Port of Portland's Berth 601 Floating Dock
The Port of Portland's facilities, being located on the Columbia and Willamette Rivers, are subjected to extreme water level fluctuations. Over the years, the Port has used floating docks...
Batter Piles and the Seismic Performance of Pile-Supported Wharves
This paper discusses the role of batter piles in the seismic performance of wharves, based on the results of a nonlinear soil-structure interaction analysis of a pile-supported wharf with...
Non-Intrusive Rayleigh Wave Measurement System for Soil Profiling in Ports
Accurate shear wave velocity profiles have been long recognized as essential data to evaluate the dynamic response of soil deposits and soil-structure interaction under earthquake and...
Terminal Asphalt Patching: An Innovative Approach
Asphaltic concrete has dominated the terminal industry as the pavement of choice for years. It is readily available and economical to install but requires considerable maintenance expense....
Use of Interactive Simulation Environments for Evaluation of Water Supply Reliability
This paper investigates physical performance measures and their practical application to a regional water resource system for western Washington. Specific criteria for characterizing the...
International Air Transportation
A New International Airport
This proceedings,
Durability Failure of a Concrete Block Port Pavement
A concrete block port pavement began showing distress after 7.5 years of use. Initial repair attempts found extensive areas of deterioration. The concrete blocks were cracking, spalling,...
Investigation of a Concrete Blistering Failure
During construction of a concrete pavement at a military airfield, numerous small blisters formed on the concrete surface behind the slipform paver and were filled by the contractor using...
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