Author: Noya, L ARRB Group Ltd Priestly, N Lake, N ARRB Group Ltd | Size: 9.58 MB | Format:PDF | Quality:Original preprint | Publisher: Austroads | Year: 2012 | pages: 122
The Washington State Department of Transportation (WSDOT) frequently employs deep pile or caisson bridge foundations for its bridge structures. Deep pile and drilled shaft foundations are increasingly important for seismic design in Washington state, because of increased seismic design load demands in bridge design specifications. A common caisson is a reinforced concrete filled tube caisson. Although these types of foundation elements are common, there are few guidelines on their design. As a result, current WSDOT design methods are conservative and neglect the many benefits provided by composite action of the concrete and the steel tube, which may result in increased cost and size of the foundation. Recent research on composite concrete filled steel tubes (CFT) shows significant benefit for applications using CFT elements, in particular that CFT elements can develop more lateral resistance and greater inelastic deformation capacity with less deterioration of resistance than reinforced concrete elements of the same weight and diameter. Hence the use of this composite action permits smaller diameter and shorter caisson foundations resulting in cost savings associated with a smaller piles and drilled shafts, less material and reduced construction time and cost. This research involves consideration of the composite properties of CFT members with internal reinforcement, and this special case of internally reinforced CFT is identified as RCFT in this report. The research study used analytical tools verified using past experimental and analytical research on CFT members and foundation connections without internal reinforcement. The research included comprehensive review of past research results including experiments and analysis of CFT and RCFT elements and connections. Design models were evaluated and compared to prior test results to determine their accuracy and reliability. A comprehensive analytical study was performed to extend this prior research to current WSDOT RCFT applications. The analytical studies were calibrated to past experimental results to document their accuracy, and the analysis included development of basic design models, fiber or section based analysis, and detailed continuum based models. No experiments were included in this initial study, but observations from prior experimental research were to be used to support the work. The goals of this preliminary study were to develop initial answers to uncertainly in the design process of these components and their connections to permit the WSDOT to begin to employ the benefits of composite action for these sub-structural systems. To that end, specific design recommendations from this preliminary research study are provided. Finally, an overview of the additional research needed to further develop the deep foundation system is provided.
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Initial Investigation of Reinforced Concrete Filled Tubes for Use in Bridge Foundations
Author: Roeder, Charles Lehman, Dawn | Size: 3.01 MB | Format:PDF | Quality:Original preprint | Publisher: Washington State Department of Transportation | Year: 2012 | pages: 129
The Washington State Department of Transportation (WSDOT) frequently employs deep pile or caisson bridge foundations for its bridge structures. Deep pile and drilled shaft foundations are increasingly important for seismic design in Washington state, because of increased seismic design load demands in bridge design specifications. A common caisson is a reinforced concrete filled tube caisson. Although these types of foundation elements are common, there are few guidelines on their design. As a result, current WSDOT design methods are conservative and neglect the many benefits provided by composite action of the concrete and the steel tube, which may result in increased cost and size of the foundation. Recent research on composite concrete filled steel tubes (CFT) shows significant benefit for applications using CFT elements, in particular that CFT elements can develop more lateral resistance and greater inelastic deformation capacity with less deterioration of resistance than reinforced concrete elements of the same weight and diameter. Hence the use of this composite action permits smaller diameter and shorter caisson foundations resulting in cost savings associated with a smaller piles and drilled shafts, less material and reduced construction time and cost. This research involves consideration of the composite properties of CFT members with internal reinforcement, and this special case of internally reinforced CFT is identified as RCFT in this report. The research study used analytical tools verified using past experimental and analytical research on CFT members and foundation connections without internal reinforcement. The research included comprehensive review of past research results including experiments and analysis of CFT and RCFT elements and connections. Design models were evaluated and compared to prior test results to determine their accuracy and reliability. A comprehensive analytical study was performed to extend this prior research to current WSDOT RCFT applications. The analytical studies were calibrated to past experimental results to document their accuracy, and the analysis included development of basic design models, fiber or section based analysis, and detailed continuum based models. No experiments were included in this initial study, but observations from prior experimental research were to be used to support the work. The goals of this preliminary study were to develop initial answers to uncertainly in the design process of these components and their connections to permit the WSDOT to begin to employ the benefits of composite action for these sub-structural systems. To that end, specific design recommendations from this preliminary research study are provided. Finally, an overview of the additional research needed to further develop the deep foundation system is provided.
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This electronic circular, published as a supplement to Transportation Research Circular E-C049, contains two papers presented at the 9th International Bridge Management Conference. The objective of the conference was to provide a forum for the exchange of information about the state of the practice and state of the art in bridge management systems between practitioners and researchers in all levels of the public and private sectors.
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This report, prepared under the sponsorship of the Transportation Research Board (TRB) Task Force on Accelerating Innovation in the Highway Industry (A5T60), summarizes three workshops held, respectively, in Washington, D.C. on November 16-17, 2000; in Indianapolis, Indiana on March 18-19, 2002; and in Pittsburgh, Pennsylvania on April 10-12, 2002. The objective of this workshop series was to provide a forum for the exchange of new ideas and developments in the field of accelerated construction. All three workshops were sponsored by the TRB Task Force A5T60. The workshops in Indianapolis and Pittsburgh were presented in cooperation with the Federal Highway Administration and the American Association of State Highway and Transportation Officials. Significant observations from the workshop series are presented in the following areas: management; technology transfer; corridor analysis; secondary disciplines (e.g., geotechnology); constructability; innovative (nontraditional) financing; roles and responsibilities; utilities and railroads; accelerated project partnering; incentives; specification language and rapid testing; value engineering; project consolidation; statistics and the customers; prefabrication and modular technologies; work zones improvement and its usage in construction; national research; and Accelerated Construction Technology Team (ACTT) workshops and national resources.
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This circular includes a series of papers that examine practical and reliable laboratory tests that could be considered for ranking the rutting potential of hot-mix asphalt paving mixtures. The circular also includes a literature review of performance tests. Each paper is entered separately in the TRIS database.
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With the advent of limit states design methodology in North American design specifications, there has been increasing demand to obtain statistical data to assess the reliability of structural and geotechnical designs. Reliability depends on load and resistance factors that are determined through calibration procedures using available statistical data. This Circular describes methodologies that can be used to determine load and resistance factors for geotechnical and structural design. The Circular begins with basic reliability concepts, continues with detailed procedures that can be used to characterize data to develop the statistics and functions needed for reliability analysis, presents detailed step-by-step examples, and concludes with practical considerations when statistical data are limited. Closed-form solutions for estimating load and resistance factors that can be used for simple cases, as well as more rigorous probabilistic analysis methods such as the Monte Carlo method, are discussed in detail. Procedures are provided for situations where either single or multiple loads must be considered. An example is also provided that demonstrates the effect of considering only the variability of the input parameters for a given design methodology versus considering the overall variability of the design method. Such an approach can also be used to assess the effect of variability of a given design parameter on the reliability of the design. This Circular is written to educate users of AASHTO, or similar Load and Resistance Factor Design (LRFD) specifications, on how load and resistance factors are developed. Furthermore, there are some cases when new load and/or resistance factors must be developed, or when current load or resistance factors are not directly applicable due to project- or region-specific issues. The information provided herein can be used to estimate load and resistance factors where adjustment of these factors is justified based on local experience and data. Criteria for documentation of calibration input and results are also provided. This Circular has been written with the assumption that the reader has some familiarity with basic statistical concepts and tools. However, for the convenience of those lacking that familiarity, a brief summary of basic statistical concepts is provided in an appendix.
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The objective of this circular is to provide information on practices that agencies have found to be successful and provide a reasonable degree of uniformity and standardization in the evaluation of chemical stabilizers used in soil stabilization. The circular is intended to provide the potential user of any chemical stabilizer with important points to consider in evaluating whether or not the stabilizer is suitable for the intended use. Agencies have found that test results from either laboratory tests or field evaluation tests need to be presented in comparison with those performed on untreated soils under the same environmental and loading conditions. For the untreated soils (control specimens), experience has shown that all mixing and mechanical manipulations of the in-place soil should be similar to those performed on the treated soils. The use of the procedures outlined in this circular can assist in achieving a more uniform approach to the evaluation of chemical stabilizers. However, engineers who are thoroughly familiar with chemical stabilizers or those who are seeking specific performance criteria from the stabilized soil may prefer to use a modified performance testing technique that would be more applicable to the intended use of the product. In such cases, the procedures outlined in this circular may be considered as a norm for judging whether the results obtained using modified techniques are sufficiently different to warrant a departure from the approach described in this circular.
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Rehabilitation of existing pavements is a top pavement priority facing transportation agencies. Hot-mix asphalt (HMA) overlays on asphalt pavements is an accepted option by all transportation agencies for restoring rideability, improving functional pavement performance, and increasing the structural capacity of the existing pavement system. HMA overlays can also be considered for application to an existing, deteriorated portland cement concrete (PCC) pavement providing measures are taken to eliminate reflection cracking emanating from the cracks and joints in the PCC pavement through the HMA overlay. One such measure is to rubblize the existing PCC pavement. This process was discussed in a two-part session on rubblization of portland cement concrete pavements at the 2005 Annual Meeting of the Transportation Research Board. The papers in this document were written following the session and are based on the presentations.
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This circular includes an introduction containing highlights from a roundtable discussion and four papers that were presented during the 2005 Transportation Research Board 84th Annual Meeting at the Context-Sensitive Design Workshop. The papers explore street design in small European towns; context-sensitive design aspects of arterial streets in Berlin, Germany; and issues relative to historic sites such as Stonehenge in the United Kingdom.
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Bituminous emulsions were discussed in a technical session at the 84th Annual Meeting of the Transportation Research Board in January 2005. The papers in this document were written following the session and are based on the presentations. These four papers serve as an overview of the chemistry, production, quality assurance testing, and application of bituminous emulsions.
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