Download or read book Field Testing of Horizontally Curved Steel Girder Bridges written by Robert J. Kissane and published by . This book was released on 1972 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Field testing of horizontally curved steel girder bridges written by and published by . This book was released on 1975 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Development of LRFD Specifications for Horizontally Curved Steel Girder Bridges written by J. M. Kulicki and published by Transportation Research Board. This book was released on 2006 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report contains the findings of research performed to develop design specifications for horizontally curved steel girder bridges.

Download or read book Improved Design Specifications for Horizontally Curved Steel Girder Highway Bridges written by Dann H. Hall and published by Transportation Research Board. This book was released on 1999 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Behavior Design and Construction of Horizontally Curved Composite Steel Box Girder Bridges microform written by Muayad Whyib Aldoori and published by Library and Archives Canada = Bibliothèque et Archives Canada. This book was released on 2004 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt: Horizontally curved girder bridges have been used considerably in recent years in highly congested urban areas. However, although significant research on physical testing and advanced analysis has been underway for the past decade, the practical employment of many recommendations has not been achieved by the engineering community nor have standards reflecting this work been brought into practice. The design process of curved composite bridges involves tracking the stresses and the potential failure change in the girders during erection, construction and service loading stages. For structural safety and serviceability, the designer estimates the stresses induced within the bridge and assure that they do not exceed the applicable specified limit state as required in bridge design standards. However, the designer may be concerned about the level of approximation that is used in his estimate or even the applicability of the underlying theory. To answer this question and provide the designer with more insight into the behavior of the curved bridges, the field testing during construction and service loading of a curved bridge located near Baltimore, Maryland is re-examined here using linear elastic three-dimensional finite element modeling. Comparisons are made between the finite element results and the measured results. Finally, to facilitate the finite element modeling effort for use by a designer, ANSYS Parametric Design Language (APDL) capabilities are used here to develop an analysis/design tool for "Bath-Tub" style curved steel girder bridges. This tool is then used to evaluate the effects of several important design variables on the response and behavior of the girders during the construction phase. This study demonstrates the ability of finite element modeling to assess the stiffness, serviceability performance, buckling behavior and ultimate strength of curved bridges during construction and it is a major step towards a performance based approach to design for stability. The level of safety or reliability that would be available during the erection and the construction processes of horizontally curved girder bridges represents another major concern for the designer. A three span continuous curved box girder bridge in Houston, Texas is used in this study as an example reflecting current detailing and fabricating practice and it is chosen for a detailed evaluation of the structural safety/reliability during the erection and construction process. This task involves simulating the girder erection and concrete slab placement sequence of the bridge using comprehensive nonlinear three dimensional finite element modeling.

Download or read book Guidelines for Analysis Methods and Construction Engineering of Curved and Skewed Steel Girder Bridges written by and published by Transportation Research Board. This book was released on 2012 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: "TRB's National Cooperative Highway Research Program (NCHRP) Report 725: Guidelines for Analysis Methods and Construction Engineering of Curved and Skewed Steel Girder Bridges offers guidance on the appropriate level of analysis needed to determine the constructability and constructed geometry of curved and skewed steel girder bridges. When appropriate in lieu of a 3D analysis, the guidelines also introduce improvements to 1D and 2D analyses that require little additional computational costs."--Publication information.

Download or read book Field Testing and Computer Modeling of a Curved Steel Girder Bridge written by Stephen P. Bott and published by . This book was released on 2002 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Static and Dynamic Testing of a Curved Steel Girder Bridge in Salt Lake City Utah written by Kevin C. Womack and published by . This book was released on 2001 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book AASHTO Guide Specifications for Horizontally Curved Steel Girder Highway Bridges with Design Examples for I Girder and Box Girder Bridges written by and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Field Testing of the Wolf Creek Curved Girder Bridge written by Robert S. Turnage and published by . This book was released on 2009 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Wolf Creek Bridge is a curved, multi-girder three span steel composite bridge located south of Narrows, Virginia, that was completed in 2006. A finite element model of the bridge revealed that pier flexibility may be important in modeling the bridge. In addition, questions have been raised as to the effectiveness of the C15x33 diaphragms in providing lateral transfer of loads between members. This study was conducted as Phase I of a project for which the overall goal was to use field testing to obtain a better understanding of the behavior of multi-span curved girder bridges. An array of vertically oriented accelerometers was located along the inner and outer edges of the bridge, along with radially oriented accelerometers along the outer edge, a tangentially oriented accelerometer on the outer edge, and an additional vertical accelerometer placed in the middle of the center span. Dynamic response data were collected under a variety of excitations, including sinusoidal forcing induced by an electro-dynamic shaker, impulse loadings at various locations, and several different vehicular loads. The dynamic data were transformed into the frequency domain and analyzed using a simple frequency domain algorithm to extract vibration frequencies and mode shapes. The resulting frequencies and mode shapes were compared with the existing finite element model. The findings indicated that not only is pier flexibility important, as had been hypothesized, but also that end constraints imposed by highway guardrails change both the natural frequencies and the mode shapes in ways that had not been anticipated. Frequencies of modes with strong pier participation and modes with strong transverse (hogging) components were lower than predicted by the computer model, suggesting that pier stiffness may be less than the model predicted and that transverse stiffness, to which the diaphragms contribute, may also be estimated. Implications of this study could have a significant effect on future health monitoring applications as they pertain to both curved and straight girder bridges. It is essential that finite element models in such long-term applications be able to reproduce the "as-built" response characteristics of a bridge. The current study raised significant issues about the ability to model the behavior of curved girder bridges correctly. Thus, it will be important to perform subsequent numerical research studies to develop models that will result in more precise predictions and to use these and other methods being developed in any health monitoring applications.

Download or read book Predicting the Behavior of Horizontally Curved I girders During Construction written by Jason Clarence Stith and published by . This book was released on 2010 with total page 660 pages. Available in PDF, EPUB and Kindle. Book excerpt: The majority of a bridge designer's time is spent ensuring strength and serviceability limit states are satisfied for the completed structure under various dead and live loads. Anecdotally, the profession has done an admirable job designing safe bridges, but engineering the construction process by which bridges get built plays a lesser role in the design offices. The result of this oversight is the complete collapse of a few large bridges as well as numerous other serviceability failures during construction. According to the available literature there have been only a few attempts to monitor a full-scale bridge in the field during the entire construction process. Another challenge for engineers is the lack of analysis tools available which predict the behavior of the bridge during the intermediate construction phases. During construction, partial bracing is present and the boundary conditions can vary significantly from the final bridge configuration. The challenge is magnified for complex bridge geometries such as curved bridges or bridges with skewed supports. To address some of the concerns facing engineers a three span curved steel I-girder bridge was monitored throughout the entire construction process. Field studies collected data on the girder lifting behavior, partially constructed behavior, and concrete deck placement behavior. Additional analytical studies followed using the field measurements to verify the finite element models. Finally, conclusions drawn from the physical and analytical testing were utilized to derive equations that predicted behavior, and analysis tools were developed to provide engineers with solutions to a wide range of construction related problems. This dissertation describes the development of two design tools, UT Lift and UT Bridge. UT Lift is a macro-enabled Excel spreadsheet that predicts the behavior of curved I-girders during lifting. The derivation of the equations necessary to accomplish these calculations and the implementation are described in this dissertation. UT Bridge is a PC-based, user-friendly, 3-D finite element program for I-girder bridges. The basic design philosophy of UT Bridge aims to allow an engineer to take the information readily available in a set of bridge drawings and easily input the necessary information into the program. A straight or curved I-girder bridge with any number of girders or spans can then be analyzed with a robust finite element analysis for either the erection sequence or the concrete deck placement. The development of UT Bridge as well as the necessary element formulations is provided in this dissertation.

Download or read book Bridge Field Testing of an Existing Steel Girder Bridge written by William Curtis Keeling and published by . This book was released on 1997 with total page 562 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Analytical and Experimental Study of Horizontally Curved Steel Bridge Girders with Tubular Top Flanges written by Haiying Ma and published by . This book was released on 2015 with total page 680 pages. Available in PDF, EPUB and Kindle. Book excerpt: The test specimen was tested up to and beyond the maximum load capacity. An updated FE model, including accurate material properties, geometric imperfections, and test boundary conditions, was used to analyze the test specimen and make comparisons with the test data. The FE results and test data show that the design recommendations can be used to safely design curved TFG1 bridges for construction conditions. The close agreement of the FE results with the test data indicates that the FE models can be used to accurately predicate the response of curved TFG1 bridges.

Download or read book Field Testing of the Wolf Creek Curved Girder Bridge written by Jacqueline E. Miller and published by . This book was released on 2009 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Wolf Creek Bridge is a curved, multi-girder three span steel composite bridge located south of Narrows, Virginia, that was completed in 2006. A finite element (FE) model of the bridge revealed that pier flexibility may be important in modeling the bridge. In addition, questions have been raised as to the effectiveness of the C15x33 diaphragms in providing lateral transfer of loads between members. This study was conducted as Phase II of a project for which the overall goal was to use field testing to obtain a better understanding of the behavior of multi-span curved girder bridges. The Phase I study was published separately (Turnage and Baber, 2009). During Phase II, an array of 49 strain gages was installed on the superstructure of the bridge: 34 gages were installed on the four girders at the mid-point of the center span, and 15 gages were installed on the three diaphragm members located closest to mid-span. The bridge was then subjected to static and dynamic applications of a loaded dump truck for which the axle loads were quite close to those of an HS-20 truck. The static strains were measured when the truck was located at 19 different locations on the inner and outer lanes. The dynamic strains were measured under the truck crossing the bridge at normal traffic speed for the structure. The static loading was then replicated on the FE model. The measured static strains were compared with the strains computed from the FE model. Both measured and computed strains on the girders were used to estimate distribution factors, which were compared to evaluate the effectiveness of moment transfer between girders. The measured static and dynamic strains were also compared to estimate dynamic amplification factors. Finally, measured and computed diaphragm strains were compared to evaluate the FE model's diaphragm girder approximation. The study found that the diaphragms transfer relatively little load from the loaded lane toward the unloaded lane but slightly more load transfers toward the outer girders than toward the inner girders. Further, the FE model predicts slightly greater transfer of load between girders than was measured in the field, suggesting that the model overestimates the stiffness of the diaphragm to girder connection. Finally, the measured strains and strains computed using the FE model predict different neutral axis locations. Following additional numerical studies, it was concluded that the FE model predicted the neutral axis to be higher than it should be, based upon transformed section calculations. In addition, full composite action based upon transformed section calculations should result in a neutral axis location higher than was determined from field data measurements. This suggests that some slip might be occurring between the girders and the haunch.

Download or read book Instrumentation and Live Load Testing of I girder Bridges for Cross frame Fatigue Analysis written by Esteban Zecchin and published by . This book was released on 2019 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt: The work outlined in this thesis is part of a larger study on the behavior of cross-frames in steel bridge systems. The study is funded by the National Cooperative Highway Research Program (NCHRP 12-113). The fundamental goals of the research investigation are to produce methodologies and design guidelines for the following: • evaluation of fatigue design stresses in cross-frames in straight and horizontally curved steel I-girder bridges; • calculation of minimum cross-frame strength and stiffness requirements for stability bracing of I-girders during construction and in-service; • development of improved methods to account for the influence of end connection details on cross-frame stiffness that extend beyond and improve upon the suggested guidance currently provided in Article C4.6.3.3.4 of the AASHTO LRFD Bridge Design Specifications. This work includes field monitoring and parametric FEA studies. The field studies are focused on three bridges: 1) a straight bridge with normal supports, 2) a straight bridge with skewed supports, and 3) a horizontally curved bridge. The field studies include rainflow monitoring of fatigue induced stresses in select cross-frames and the girders for a period of approximately 4 weeks as well as live load tests using trucks of known weights. This thesis focuses on the instrumentation and live load tests performed in the three bridges. In addition to the field data, an assessment of the most widely used commercial design software for steel bridges was carried out. The software was selected based upon a survey of several bridge owners and designers

Download or read book Engineering Research Series Research Report RR written by New York (State). Engineering Research and Development Bureau and published by . This book was released on 1975 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Field testing and load rating of a steel girder highway bridge written by Peter Schönwetter and published by . This book was released on 1999 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt: