Papers by Habib Tabatabai
Transportation Research Board eBooks, Feb 7, 2005
Systematic, well-designed research provides the most effective approach to the solution of many p... more Systematic, well-designed research provides the most effective approach to the solution of many problems facing highway administrators and engineers. Often, highway problems are of local interest and can best be studied by highway departments individually or in cooperation with their state universities and others. However, the accelerating growth of highway transportation develops increasingly complex problems of wide interest to highway authorities. These problems are best studied through a coordinated program of cooperative research. In recognition of these needs, the highway administrators of the American Association of State Highway and Transportation Officials initiated in 1962 an objective national highway research program employing modern scientific techniques. This program is supported on a continuing basis by funds from participating member states of the Association and it receives the full cooperation and support of the Federal Highway Administration, United States Department of Transportation. The Transportation Research Board of the National Academies was requested by the Association to administer the research program because of the Board's recognized objectivity and understanding of modern research practices. The Board is uniquely suited for this purpose as it maintains an extensive committee structure from which authorities on any highway transportation subject may be drawn; it possesses avenues of communications and cooperation with federal, state, and local governmental agencies, universities, and industry; its relationship to the National Research Council is an insurance of objectivity; it maintains a full-time research correlation staff of specialists in highway transportation matters to bring the findings of research directly to those who are in a position to use them. The program is developed on the basis of research needs identified by chief administrators of the highway and transportation departments and by committees of AASHTO.
BMC Bioinformatics, Jun 15, 2021
Following the publication of the original article [1], the authors identified an error in the equ... more Following the publication of the original article [1], the authors identified an error in the equation. The correct equation is given below. The incorrect equation: The correct equation: The original article [1] has been corrected.
Field Implementation of Tuned Mass Dampers for Suppression of Stay Cable Vibration
NCHRP-IDEA Program Project Final Report, 2003
This Innovations Deserving Exploratory Analysis (IDEA) project is a follow-on activity for an ear... more This Innovations Deserving Exploratory Analysis (IDEA) project is a follow-on activity for an earlier IDEA project (NCHRP-50) to demonstrate the effectiveness of tuned mass dampers (TMDs) in minimizing stay cable vibrations in a full-scale field trial on an actual highway bridge. Several visco-elastic materials and model configurations were investigated to identify models that could be considered for full-scale prototype adaptation. Simultaneous to experimenting with various models, analytical investigations were conducted to calculate required properties and dimensions of the full-scale versions of the models. The analytical evaluation identified a problem in adapting the scaled models to full-scale sizes due to low frequency vibrations of the actual bridge stay cables. This problem was addressed by using a hybrid of impact and tuned damper. Laboratory tests, conducted on model cables using two types of tuned impact dampers (TIDs), showed the TID to be more effective than the TMD. ...
Damage Detection Using Precursor Transformation Method
In this paper, a new concept for damage detection and health monitoring of structures is presente... more In this paper, a new concept for damage detection and health monitoring of structures is presented. The Precursor Transformation Method (PTM) is based on determining the causes (precursors) of change in the measured state of the structure under non-variable loading conditions. In this method, the measured changes in the state of a structure are related to damage precursors through a transformation matrix. This matrix is formed by determining the patterns of change in the state of structure associated with externally imposed strains or displacements representing possible damage scenarios.
Analytical and Experimental Evaluation of Repairs to Continuous PC Girder Bridge
Journal of Performance of Constructed Facilities, 2020
AbstractThe Wanjiang Bridge, completed in 1976, is the first continuous prestressed concrete (PC)... more AbstractThe Wanjiang Bridge, completed in 1976, is the first continuous prestressed concrete (PC) girder bridge erected using the incremental launching method in China. The bridge consists of prism...
Construction and Building Materials, 2018
Properties of polyester resin blended with FGD gypsum were studied. Ambient mechanical properties... more Properties of polyester resin blended with FGD gypsum were studied. Ambient mechanical properties were markedly enhanced with up to 50% gypsum content. TGA results showed major improvement in mass retention with higher gypsum contents. FGD gypsum can form an exterior barrier protecting the interior areas from fire. FGD gypsum can potentially be a low-cost additive for fire resistance in polymers.
Short-term environment-dependent creep and shrinkage of mature concrete
Magazine of Concrete Research, 2017
The objective of this research was to experimentally assess the relative significance of short-te... more The objective of this research was to experimentally assess the relative significance of short-term environment-dependent creep and shrinkage strains on the relief of temperature-induced restraint stresses in bridges. Although substantial theoretical and experimental works have been performed on long-term creep and shrinkage effects under varying environmental conditions, controlled experimental works on short-term creep and shrinkage effects under realistic outdoor ambient conditions are lacking. In this study, multiple short-duration tests were performed on concrete cylinders (in Chicago, IL, USA) to evaluate the short-term environment-dependent creep and shrinkage of mature concrete caused by outdoor environmental variations. The results indicate that short-term environment-dependent creep and shrinkage of concrete are each limited to a maximum of approximately 15% of the corresponding changes in temperature strains. However, the values of short-term environment-dependent creep a...
Monte Carlo simulation of cable fatigue stresses in two cable-stayed bridges
Bridge Structures, 2006
ABSTRACT
Analysis of Permit Vehicle Loads in Wisconsin
This study evaluated the impact of the 250-kip Wisconsin Standard Permit Vehicle against the over... more This study evaluated the impact of the 250-kip Wisconsin Standard Permit Vehicle against the overloaded vehicles operating on Wisconsin roads in recent years. The evaluation was conducted using three sets of data: 1) overloaded vehicle records within weigh-in-motion data collected in 2007; 2) the single-trip permit application records from 2004 to 2007; and 3) overloaded vehicles in neighboring states, including Minnesota, Iowa, Michigan, and Illinois. Descriptive statistical analyses were conducted for the collected overloaded vehicle data, and model vehicles that represent heavies 5% of the overloaded vehicles were created. The maximum moment/shear in simply supported, 2-span and 3-span continuous girders by the representative vehicles were calculated and compared with the impact of Wis-SPV. The study indicates Wis-SPV envelopes almost all single-unit trucks with less than 9 axles, which attributes 80% of the total permit records. The analysis of WIM records shows that about 0.035% of total overloaded vehicles (records) may exceed the impact of the 250-kip Wis-SPV. A 5-axle short truck was proposed to supplement Wis-SPV for possible use in the WisDOT Bridge Manual.
The Effect of Crack Development and Propagation on the Maintenance Requirements of Precast Deck Bridges
Precast Panel Composite Bridge Decks
ABSTRACT
Combined Effects of Sag and Bending Stiffness on Cable Vibrations
ABSTRACT
Evaluation of stay cable tension using a non-destructive vibration technique
ABSTRACT
Tuned Dampers and Cable Fillers for Suppression of Bridge Stay Cable Vibrations
ABSTRACT
Evaluation of Continuity in Prestressed Concrete Jointless Bridges
ABSTRACT
Methods of Corrosion Prevention and Control in Concrete Bridges
Aesthetic Coatings for Steel Bridge Components
The effectiveness of aesthetic coating systems for steel bridges was studied. Twelve 2-coat, 3-co... more The effectiveness of aesthetic coating systems for steel bridges was studied. Twelve 2-coat, 3-coat, and duplex coating systems were selected and subjected to a series of accelerated weathering and mechanical tests to determine their performance. The performance evaluation was made by considering gloss and color retention, coating discontinuities, rust creepage, and coating adhesion. Surface preparation and coating application procedures were given significant consideration. The best color and gloss retention was achieved by the 3-coat fluoropolymer systems, but they required higher materials cost. One of the two 2-coat systems performed nearly the same as the 3-coat polyurethane coating systems and the other showed a poor performance with significant color fading. Duplex polyurethane systems showed comparable performance to that of the 3-coat fluoropolymer systems but they performed better than the 3-coat polyurethane systems. This was primarily due to the added corrosion protectio...
Water Absorption Tests for Measuring Permeability of Field Concrete
The research results from CFIRE Project 04-06 were communicated to engineers and researchers in t... more The research results from CFIRE Project 04-06 were communicated to engineers and researchers in this project. Specifically, the water absorption of concrete samples (i.e., 2-in. thick, 4-in. diameter discs cut from concrete cylinders) was found strongly related to the chloride permeability of the samples. A test procedure was proposed based on the comments from the engineers and researchers in the related areas, and the ASTM standards. Tests are needed following this procedure to facilitate the acceptance of the generated data and the comparison with the related data in the literature.
Evaluation of Various Damping Treatments for Stay Cables, #362
Large-amplitude rain-wind induced cable vibrations is a source of concern for cable-stayed bridge... more Large-amplitude rain-wind induced cable vibrations is a source of concern for cable-stayed bridges in the United States and worldwide. Enhanced cable damping is a crucial factor in the control of stay cable vibrations including the rain-wind vibration phenomenon. In a research project sponsored by the National Cooperative Highway Research Program (NCHRP), the effectiveness of a number of internal and external methods for damping improvements in stay cables was investigated. Experimental work was based on comparative assessments performed on two one-seventh-scale models of a representative stay cable. Each cable model was approximately 45 ft long. The methods investigated included conventional and damping grout fillers, conventional neoprene rings (washers), polyurethane filled guide pipes, damping tapes, and external tuned mass dampers. In this paper, a discussion of different damping treatments and their effectiveness is presented. The degrees of effectiveness varied considerably for the various treatments. Of the methods tested, the tuned mass damper for stay cables was found to be the most effective method.
Continuity Considerations in Prestressed Concrete Jointless Bridges
Structures 2004, 2004
Jointless bridges, which have been constructed by several states, promote reduced maintenance cos... more Jointless bridges, which have been constructed by several states, promote reduced maintenance costs, improved riding quality, lower impact loads, reduced snowplow damage to decks and approaches, and improved seismic resistance. In spite of many of these recognized benefits, the behavior of such structures is not yet fully understood, and nationally adopted criteria for their design are still lacking. This paper presents the results of an experimental and analytical research program, funded by the Federal Highway Administration, on the behavior of jointless and integral abutment bridges. The experimental work included testing and monitoring of bridge models and a bridge structure under construction, tests of bridge components; and a field survey of fifteen jointless bridges. Experimental results have resolved many questions regarding environmental effects, long-term and time dependent loading in combination with live and dead load effects. Results indicated that the live load continuity of the bridge can be reduced significantly with long-term and time dependent loading effects. In the analytical phase, the response of a jointless bridge was evaluated with respect to various design parameters. The research indicated that analysis procedures can be used to adequately quantify the structural response if accurate material and environmental parameters are known. However, in lieu of complex analyses, simplified design procedures are recommended.
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Papers by Habib Tabatabai