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In Situ Assessment Of Concrete Bridge Decks And Pavements Using Stress Wave Based Methods
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Book Synopsis In-situ Assessment of Concrete Bridge Decks and Pavements Using Stress-wave Based Methods by : Mengxing Li
Download or read book In-situ Assessment of Concrete Bridge Decks and Pavements Using Stress-wave Based Methods written by Mengxing Li and published by . This book was released on 2017 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Concrete infrastructure of United States is aging and deteriorating. Accurate assessment the condition of concrete infrastructure is critical for its maintenance and rehabilitation. Stress-wave based methods, including ultrasonic surface wave (USW) and impact echo (IE), are becoming popular for characterizing defects and mechanical properties of concrete infrastructures. In this dissertation, a comprehensive literature review of seismic wave theory and common types of defects identified in concrete infrastructures, as well as stress-wave based methods used for concrete infrastructure monitoring and characterizing on a selected concrete bridge deck and two concrete pavement segments are present. The utility and reliability of both methods were carefully evaluated and validated based on the comparison analysis with other destructive or non-destructive testing (NDT) methods carried out in the field or laboratory for the same bridge decks and pavement segments, such as the concrete hydro-demolition, drilling, static modulus of elasticity of concrete specimens in compression and ground penetrating radar (GPR). Detailed investigation of the sensitivity and limitation of stress-wave based methods for different types of defects identified in concrete bridge decks and pavements has been performed and presented. The outcome of this study is to expand the knowledge of stress-wave based methods, to better understand their strengths and limitations, to evaluate the reliability and utility of both the USW and IE test results in characterizing and monitoring defects and mechanical properties of concrete infrastructures. The result of this study is most beneficial for transportation agencies and researchers to use stress-wave based methods properly and effectively for further feasibility studies or monitoring of concrete infrastructures"--Abstract, page iv.
Book Synopsis Application of Seismic Surface-waves in Concrete Bridge-deck Evaluation by : Farhad Fetrat
Download or read book Application of Seismic Surface-waves in Concrete Bridge-deck Evaluation written by Farhad Fetrat and published by . This book was released on 2016 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accurate and timely condition assessment of bridge decks is essential for economic management of aging highway bridges. The ability to evaluate concrete modulus profile in a bridge deck can help the detection of early signs of deterioration and optimize the bridge maintenance procedures. This study presents a new method for modulus profiling of concrete bridge decks. The stiffness matrix method is used to simulate wave propagation in a layered media. The results are compared to numerical finite element models. Dispersion analysis is done using the multi-channel analysis of surface waves (MASW) and phase-shift methods. The characteristics of dispersion surface are analyzed and the effects of model parameters on dispersion surface are examined through a series of parametric studies. An inversion technique is proposed for a fast inversion of surface-wave data collected on bridge decks. This technique utilizes a database of pre-calculated dispersion surfaces and takes advantage of the observed patterns in the parametric study as a priori information for the inversion process.
Book Synopsis Evaluation of Bridge Deck Delamination Investigation Methods by : Henrique L. M. dos Reis
Download or read book Evaluation of Bridge Deck Delamination Investigation Methods written by Henrique L. M. dos Reis and published by . This book was released on 1998 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: An objective view of the relative advantages and limitations of the nondestructive testing and evaluation methods that are currently used in the inspection of bridge decks is presented and discussed. The three main nondestructive testing technologies that were evaluated are impact-echo, ground penetrating radar, and infrared thermography. Nondestructive testing and evaluation procedures, including methodology and equipment to evaluate concrete bridge decks with asphalt overlays, are also presented and discussed. Current results indicate that a combination of ground penetrating radar and infrared thermography would provide the best methodology for evaluating the structural integrity, e.g., delaminations, of concrete bridge decks with overlays. Furthermore, current results also indicate that the impact-echo method shows promising future development towards the nondestructive evaluation of bridge superstructures.
Book Synopsis Handbook on Nondestructive Testing of Concrete by : V. M. Malhotra
Download or read book Handbook on Nondestructive Testing of Concrete written by V. M. Malhotra and published by CRC Press. This book was released on 2004 with total page 389 pages. Available in PDF, EPUB and Kindle. Book excerpt: Civil engineers will value this resource that examines the tools and techniques used to estimate the in-place strength on concrete, permeation properties that relate to potential durability, and the methods used to assess the internal condition of concrete and the corrosion activity of steel reinforcement.
Book Synopsis Non-Destructive Assessment of Concrete Structures: Reliability and Limits of Single and Combined Techniques by : Denys Breysse
Download or read book Non-Destructive Assessment of Concrete Structures: Reliability and Limits of Single and Combined Techniques written by Denys Breysse and published by Springer Science & Business Media. This book was released on 2012-01-20 with total page 389 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gives information on non destructive techniques for assessment of concrete structures. It synthesizes the best of international knowledge about what techniques can be used for assessing material properties (strength) and structural properties (geometry, defects...). It describes how the techniques can be used so as to answer a series of usual questions, highlighting their capabilities and limits, and providing advices for a better use of techniques. It also focuses on possible combinations of techniques so as to improve the assessment. It is based on many illustrative examples and give in each case references to standards and guidelines.
Book Synopsis Intelligent Structures by : K.P. Chong
Download or read book Intelligent Structures written by K.P. Chong and published by CRC Press. This book was released on 2003-10-04 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the International Workshop on Intelligent Structures, Taipei, Taiwan, 23-26 July 1990.
Book Synopsis Condition Assessment of Concrete Bridge Decks Using Ground Penetrating Radar by : Kien Dinh
Download or read book Condition Assessment of Concrete Bridge Decks Using Ground Penetrating Radar written by Kien Dinh and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis In Situ/ Nondestructive Testing of Concrete by :
Download or read book In Situ/ Nondestructive Testing of Concrete written by and published by . This book was released on 1984 with total page 844 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seventh Symposium on the Nondestructive Testing of Wood Proceedings by :
Download or read book Seventh Symposium on the Nondestructive Testing of Wood Proceedings written by and published by . This book was released on 1990 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bridge Deck Evaluation Using Portable Seismic Pavement Analyzer (PSPA) by : Nenad Gucunski
Download or read book Bridge Deck Evaluation Using Portable Seismic Pavement Analyzer (PSPA) written by Nenad Gucunski and published by . This book was released on 2000 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Waterproofing Membranes for Concrete Bridge Decks by : David G. Manning
Download or read book Waterproofing Membranes for Concrete Bridge Decks written by David G. Manning and published by Transportation Research Board. This book was released on 1995 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: This synthesis will be of interest to research, specifications, materials, design, and construction engineers; contract and specification administrators; agency project managers and staff; and concrete bridge deck construction contractors. This synthesis describes the state of the practice with respect to the development and present status of waterproofing membranes for concrete bridge decks. This report of the Transportation Research Board describes the use of waterproofing systems applied to new bridge decks and the rehabilitation of deteriorated concrete bridge decks. In addition, this synthesis describes current practice with regard to methods for assessing the effectiveness of membranes, criteria for use, installation practices, and factors that affect the performance of waterproofing systems in new construction and rehabilitation. Suggestions for future research are also included.
Book Synopsis Active Acoustic Sensing Technologies for Practical Uav-Based Condition Assessment of Underside Bridge Decks by : Damien Garland
Download or read book Active Acoustic Sensing Technologies for Practical Uav-Based Condition Assessment of Underside Bridge Decks written by Damien Garland and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reinforced concrete bridge decks are high performance structural elements that must survive decades of harsh mechanical and environmental loads. The structural health monitoring of bridges is a primary enabler of safe and cost-effective performance, relying on frequent inspections and repairs as needed. The undersides of concrete bridge decks are oft-overlooked areas of inspection, owing to a hard to reach and difficult location to access. Exacerbating factors to the degradation of concrete bridge decks are the freeze-thaw cycle and salt water related corrosion common in the world's Northern climates. As concrete weathers, it decays. Corrosion induced cracking and delamination are primary damage modes.Moreover, budgets are forced to contend with the seasonal roadway damage from frost-heaves and snowplows, which can lead to delays in the inspection and repair of the undersides of bridge decks. Years of neglect have led to a growing need for assessment and repair. Despite this need, the inspection of the undersides of bridge decks is laborious and costly, requiring the shutdown of roadways, the use of specialized equipment, and an above-average operator risk. Ironically, while the cost of early detection of subsurface cracks is prohibitive, the cost of repair rises when early detection is not feasible. The key is knowing where the defects are, and how extensive the damage. In recent decades, numerous methodologies for concrete crack and delamination detection have become commercially available, however the undersides of bridge decks continue to pose a challenge. Often, detection is not financially feasible until cracks have reached the surface, or concrete has fallen off the structure. Reports of vehicles struck by falling concrete are not uncommon, demonstrating the need for an affordable robust early detection methodology for failing concrete. In this thesis, a technology down-select is performed to determine the optimal solution to detecting subsurface delaminations in the underside of concrete bridge decks. The solution alighted upon is an active acoustic sensor (AAS) mounted on an unmanned arial vehicle (UAV) platform to tap and listen to the underside of bridge decks. A mechanical tapping mechanism is developed to acquire the tap data remotely using a high frequency acoustic sensor. Embedded void concrete samples of 12" and 24" form factors are used as test beds in laboratory conditions. Subsequent post-processing using the Fast Fourier Transform (FFT) and the Welch Power Spectral Density (PSD) and Hilbert-Huang Transform (HHT) are used to differentiate a solid slab from one with a void. This research has shown the methodology to be feasible, and has laid the groundwork for additional effort to refine the design and bring it to a readiness level robust enough for in-situ testing in the field.
Book Synopsis Evaluation of Concrete Bridge Decks and Pavements with and Without Asphalt Overlay Using Ground Penetrating Radar by : ManiKumar Allu
Download or read book Evaluation of Concrete Bridge Decks and Pavements with and Without Asphalt Overlay Using Ground Penetrating Radar written by ManiKumar Allu and published by . This book was released on 1996 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Statistical Modeling of United States Highway Concrete Bridge Decks by : Omar Ghonima
Download or read book Statistical Modeling of United States Highway Concrete Bridge Decks written by Omar Ghonima and published by . This book was released on 2017 with total page 261 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the backbone of the US transportation system, bridges are also its most visible part. There are over 600,000 bridges across all US states ensuring network continuity. In order to optimize such activities and use the available monies most effectively, a solid understanding of the parameters that affect the performance of concrete bridge decks is critical. The National Bridge Inventory (NBI), perhaps the single-most comprehensive source of bridge information, gathers data on more than 600,000 bridges in all fifty states, the District of Columbia, and the Commonwealth of Puerto Rico. Recently there has been a growing interest in analyzing the NBI database. The NBI uses visual inspection, a commonly practiced damage detection method, to rate bridge decks. Focusing on concrete highway bridge deck performance, the present study developed a nationwide database based on NBI data and other critical parameters, such as bridge age, deck area, climatic regions, and distance from seawater. Additionally, two new performance parameters were computed from the available concrete bridge deck condition ratings (CR): Time-in-condition rating (TICR) and deterioration rate (DR). Following the aggregation of all these parameters to form a nationwide database, filtering and processing were performed. Approaches to dealing with inconsistencies and missing data are proposed as well. After developing the nationwide database this research presents network-level, one-way statistical relationships to get a better understanding of the parameters. ☐ Next, a data mining technique on the nationwide database was used to analyze the data. Data mining is a discovery procedure to explore and visualize useful but less-than-obvious information or patterns embedded in large collections of data. Given the amount and variety of parameter types in a large data set such as that of the nationwide database, using traditional clustering techniques for discovery is impractical. As a consequence, this research has applied a novel data discovery tool called two-step cluster analysis to visualize associations between concrete bridge deck design parameters and bridge deck condition ratings. Two-step cluster analysis is a powerful knowledge discovery tool that can handle categorical and interval data simultaneously and is capable of reducing dimensions for large data sets. The two-step cluster analysis is a useful tool for bridge owners and agencies to visualize general trends in their concrete bridge deck condition data and support them in their decision-making processes to effectively allocate constrained funds for maintenance, repair, and design of bridge decks. ☐ Understanding the attributes of bridge deck performance is central to asset management. This research attempts to characterize how various environmental and structural parameters affect bridge deck performance by employing a binary logistic regression. The logistic model shows the relationship between a dependent variable (lowest vs. highest bridge deck deterioration) and the relative importance of a number of independent variables selected for this study (predictor variables). Observations of extreme bridge deck deterioration taken from the nationwide database were used in the model. Bridge deck deterioration was computed as the decrease in CR over time. Maintenance responsibility fulfillment, functional classification of inventory route, design and construction type, average daily truck traffic, climatic regions, and distance to seawater, were all used as independent variables. Our application of a binary logistic regression model for bridge deck deterioration provides practical insight regarding how certain parameters influence bridge deck performance. ☐ A leading factor in structural decline of highway bridges is the deterioration of concrete decks. Thus, a method to forecast bridge deck performance is vital for transportation agencies to allocate future repair and rehabilitation funds. The objective of this study was the development of a nationwide CR deterioration model based on the nationwide database through the use of a Bayesian statistical approach that predicts probability of CR decrease. In addition to CR data, the impact of other governing factors on CR decrease are shown in the paper, such as average daily truck traffic (ADTT), maintenance responsibility fulfillment, deck structure type, and regional climate effect. One singular advantage of this method is that it can be continually updated as additional NBI information becomes available. Moreover, the results of this model can be used as prior data in future Bayesian studies. The results presented in this study, by providing a better idea of how US concrete bridge decks are performing based on the NBI data, are intended to furnish a progressive bridge management system. ☐ Results yielded by each of the analysis above will encourage future researchers to add other crucial parameters not contained in the nationwide database such as structural design characteristics (e.g., minimum deck thickness), construction practices (e.g., curing practices), specifications (e.g., water-to-cement ratio), and other notable factors (e.g., application of deicing salts). Furthermore, analyze the nationwide database in various statistical application areas leading to more accurate understating of the factors affecting bridge deck deterioration and enhanced deck deterioration prediction models.
Book Synopsis Structural Engineering Handbook, Fifth Edition by : Mustafa Mahamid
Download or read book Structural Engineering Handbook, Fifth Edition written by Mustafa Mahamid and published by McGraw Hill Professional. This book was released on 2020-04-17 with total page 957 pages. Available in PDF, EPUB and Kindle. Book excerpt: Publisher's Note: Products purchased from Third Party sellers are not guaranteed by the publisher for quality, authenticity, or access to any online entitlements included with the product. The industry-standard guide to structural engineering—fully updated for the latest advances and regulations For 50 years, this internationally renowned handbook has been the go-to reference for structural engineering specifications, codes, technologies, and procedures. Featuring contributions from a variety of experts, the book has been revised to align with the codes that govern structural design and materials, including IBC, ASCE 7, ASCE 37, ACI, AISC, AASHTO, NDS, and TMS. Concise, practical, and user-friendly, this one-of-a-kind resource contains real-world examples and detailed descriptions of today’s design methods. Structural Engineering Handbook, Fifth Edition, covers: • Computer applications in structural engineering • Earthquake engineering • Fatigue, brittle fracture, and lamellar tearing • Soil mechanics and foundations • Design of steel structural and composite members • Plastic design of steel frames • Design of cold-formed steel structural members • Design of aluminum structural members • Design of reinforced- and prestressed-concrete structural members • Masonry construction and timber structures • Arches and rigid frames • Bridges and girder boxes • Building design and considerations • Industrial and tall buildings • Thin-shell concrete structures • Special structures and nonbuilding structures
Book Synopsis Inspection of Concrete Bridge Decks with Asphalt Overlays by : Matthew Daniel Baright
Download or read book Inspection of Concrete Bridge Decks with Asphalt Overlays written by Matthew Daniel Baright and published by . This book was released on 1998 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1985 with total page 1148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
