January/February 2001
Recent
Publications
Compiled
by Zac Ellis of FHWA's Office of Research and Technology Services
Below
are brief descriptions of reports recently published by the Federal
Highway Administration's (FHWA) Office of Research, Development, and
Technology. All of the publications are available from the National
Technical Information Service (NTIS). In some cases, limited copies
of the publication are available from the Research and Technology
(R&T) Report Center.
When ordering from NTIS, include the NTIS PB number (or publication
number) and the publication title. You may also visit the NTIS Web
site at www.ntis.gov to order publications
online. Call NTIS for current prices. For customers outside the United
States, Canada, and Mexico, the cost is usually double the listed
price. Address requests to:
National
Technical Information Service
5285 Port Royal Road
Springfield, VA 22161
Telephone: (703) 605-6000
Toll-free number: 1-800-553-NTIS (6847)
Expanded Sales Desk Hours: 8 a.m. to 8 p.m. EST, Mon.-Fri.
Requests
for items available from the R&T Report Center should be addressed
to:
R&T
Report Center, HRTS-03
Federal Highway Administration
9701 Philadelphia Court, Unit Q
Lanham, MD 20706
Telephone: (301) 577-0906
Fax: (301) 577-1421
For more
information on research and technology publications coming from FHWA,
visit the Turner-Fairbank Highway Research Center's (TFHRC) Web site
at www.tfhrc.gov,
FHWA's Web site at www.fhwa.dot.gov,
or the OneDOT information network at
http://dotlibrary.dot.gov/.
Magnetic-Based
NDE of Prestressed and Post-Tensioned Concrete Members The
MFL System Publication No. FHWA-RD-00-026 This
report describes all aspects of a study to develop a nondestructive
evaluation (NDE) system based on the concept of magnetic flux leakage
(MFL) to detect corrosion and fracture of prestressing steel in pretensioned
and post-tensioned concrete bridge members. The basic methodology is
based on introducing a direct-current magnetic field in close proximity
of the prestressing or post-tensioning steel and monitoring the variations
of the field due to loss of cross-sectional area of steel from corrosion
or fracture.
The NTIS publication number is PB2000-105941.
Development and Field Testing of Multiple Deployment Model Pile (MDMP)
Publication No. FHWA-RD-99-194
A model
pile is a calibrated tool equipped with instrumentation capable of
monitoring the pile/soil interaction over the pile history. Monitoring
includes the installation, pore pressure dissipation combined with
consolidation and soil pressure equalization, and, ultimately, the
pile behavior under loading and failure. The model pile installation
and soil structure interaction simulate the actual field conditions
of full-scale piles. As such, the obtained information can be used
directly (e.g., skin friction) or extrapolated (e.g., pore pressure
dissipation time) to predict the soil's response during full-scale
installation.
The Multiple Deployment Model Pile (MDMP) was developed as an in situ
tool for site investigations. The MDMP instrumentation is capable
of monitoring the pile/soil interaction throughout the life cycle
of a driven pile. Appendices to this report are on file at the Turner-Fairbank
Highway Research Center, McLean, Va.
The NTIS publication number is PB2000-107845.
User's
Primer for BRI-STARS (Bridge Stream Tube model for Alluvial River
Simulation)
Publication No. FHWA-RD-99-191
The BRI-STARS
(Bridge Stream Tube Model for Alluvial River Simulation) model is
a generalized semi-two-dimensional water and sediment routing model
with an integrated graphical interface for solving complicated river
engineering problems with limited data and resources. The model is
capable of computing alluvial scour/deposition through subcritical,
supercritical, and a combination of both flow conditions involving
hydraulic jumps. Unlike conventional water and sediment routing models,
it is also capable of simulating channel widening/narrowing phenomena,
as well as local scour caused by highway encroachments. It contains
a subset of FHWA's Water Surface Profile (WSPRO) computation method
subroutines for computing bridge hydraulics.
This user's primer provides a brief description of the BRI-STARS model,
installation and operations guidelines, the use of various utility
programs within the package, and an example application of the model.
Detailed instructions for the use of the utility programs included
in the BRI-STARS package, including their menu structures and their
operations, are given.
The NTIS publication number is PB2000-107371.
User's
Manual for BRI-STARS (Bridge Stream Tube Model for Alluvial River
Simulation)
Publication No. FHWA-RD-99-190
This
user's manual provides a theoretical background on the methodologies
used by the model as well as the formulations of governing flow and
sediment routing procedures. Various records needed for the operation
of the model, their description, format, and sequential positioning
within the data structure are given. Example applications, as well
as practical guidelines for the use of the model, are presented.
The NTIS publication number is PB2000-107372.
Temperature
Predictions and Adjustment Factors for Asphalt Pavement
Publication No. FHWA-RD-98-085
This
report presents the results of an analysis of the deflections and
backcalculated asphalt moduli response to the pavement temperature.
The study used deflection and temperature data from 40 sites monitored
in the Seasonal Monitoring Program of the Long Term Pavement Performance
(LTPP) program.
The report presents improved methods of estimating the temperature
within an asphalt pavement based on the measurement procedures used
for the LTPP program. The data necessary to estimate the temperature
within the asphalt included the surface temperature, time of day,
depth below the surface, and the average air temperature from the
previous day. Backcalculation of the asphalt modulus from the deflection
data of the 40 sites was related to pavement temperature, and a method
of estimating what the modulus of the asphalt would be at different
temperatures is presented. Deflection and deflection basin shape factor
response to temperature was also evaluated, resulting in relationships
for each of the items evaluated with pavement temperature.
Other
Articles in this Issue:
Learning
to Beat Snow and Ice
Safe
Plowing - Applying Intelligent Vehicle Technology
Improving
Roadside Safety by Computer Simulation
Using
the Computer and DYNA3D to save lives
LS-DYNA:
A Computer Modeling Success Story
Preservation
of Wetlands on the Federal-Aid Highway System
Internal
FHWA Partnership Leverages Technology and Innovation
New
Applications Make NDGPS More Pervasive
Center
for Excellence in Advanced Traffic and Logistics Algorithms and Systems
(ATLAS)
National
Work Zone Awareness Week (April 9 to 12) - Enhancing Safety and Mobility
in Work Zones