Download or read book Estimation of Beam Prestress by Deflection and Strain Measurements written by JinWoo An and published by . This book was released on 2012 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laboratory test of reinforced and prestressed concrete structures have been used widely to explore the behavior of reinforced and prestressed concrete components and structures; Such tests are often time-consuming and costly. However, numerical models have been shown to compare favorably with experiments. Thus, computations are viewed nowadays as efficient alternatives to tests, time-wise and cost-wise. In the research reported in this thesis, finite-element model were used in a study of pretressed structural components in order to correlate levels of pretension with deflection and strain measurements. The two main objectives were to develop a suitable finite element model of prestressed concrete beams and to forecast beam prestension on the basis of deformations resulting from specified simple load, e.g., a uniformly distributed transverse load. A commercial finite-element analysis package (ANSYS 12) was used to set up, use and evaluate the computational model. Furthermore, a finite-difference model was employed in order to ascertain the validity of ANSYS results by comparison with engineering beam theory taking into account the applied pretension. This study demonstrates the potential usefulness of deflection and strain measurements as indicators of the pretension applied or remaining in prestressed concrete beams.

Download or read book Evaluation of Prestress Cable Strain in Multiple Beam Configurations written by and published by . This book was released on 1996 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: A system to measure prestress cable strain was fabricated, software written, and the unit calibrated. Strain measurements were made by attaching four Linear Variable Differential Transformers (LVDT) to prestress cables before they were stressed. Due to limited test data and problems with the data collection, no conclusions were drawn about the loss of cable tension due to cable depressors. Due to the cooperation between the Kansas Department of Transportation and the supplier of the prestressed beams, this project resulted in a change in the casting bed configuration which will likely result in more consistent prestress cable tension. The casting bed configuration was changed from casting five beams simultaneously to casting three beams simultaneously. Other linear movements, such as bridge beam deflection, can be measured using the method and instrumentation developed in this project.

Download or read book Measurements of Prestress and Load Tests to Failure on Segmental Concrete Beams written by R. J. Woodward and published by . This book was released on 1989 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Behavior of Prestressed Concrete Beams Under Long time Loading written by Patrick Emmett Murphy and published by . This book was released on 1957 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Prestress on Strains and Deflections in Pretensioned Beams written by Stergios Koutrouvelis and published by . This book was released on 2013 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this research, nonlinear structural analysis along with finite element analysis were carried out for a pretensioned concrete beam at different levels of pretension in order to examine the effect of the change in the tendon force on the geometric stiffness of the beam. Several results were obtained for deflection, horizontal displacement and surface strains to investigate how they are affected by the level of pretension under the application of the same load in each case. These computations were compared with the tendon force to conclude whether they can be used to estimate the pretension level by means of simple measurements. The purpose was to develop a methodology for quantifying the prestress losses by taking advantage of the dependence of the prestressed concrete beam stiffness on the tendon force.

Download or read book Technical Report written by and published by . This book was released on 1962 with total page 660 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Field Measurement and Evaluation of Time dependent Losses in Prestressed Concrete Bridges written by Okey U. Onyemelukwe and published by . This book was released on 1997 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bridge Evaluation and Analysis written by National Research Council (U.S.). Highway Research Board and published by . This book was released on 1973 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Determination of Internal Strain Patterns in a Prestressed Concrete Beam written by Albert Adam Hoffman and published by . This book was released on 1952 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Validation of Prestressed Concrete I Beam Deflection and Camber Estimates written by Cullen O'Neill and published by . This book was released on 2011 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Analysis and Design of Prestressed Concrete written by Di Hu and published by Elsevier. This book was released on 2022-04-17 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: Prestressing concrete technology is critical to understanding problems in existing civic structures including railway and highway bridges; to the rehabilitation of older structures; and to the design of new high-speed railway and long-span highway bridges. Analysis and Design of Prestressed Concrete delivers foundational concepts, and the latest research and design methods for the engineering of prestressed concrete, paying particular attention to crack resistance in the design of high-speed railway and long-span highway prestressed concrete bridges. The volume offers readers a comprehensive resource on prestressing technology and applications, as well as the advanced treatment of prestress losses and performance. Key aspects of this volume include analysis and design of prestressed concrete structures using a prestressing knowledge system, from initial stages to service; detailed loss calculation; time-dependent analysis on cross-sectional stresses; straightforward, simplified methods specified in codes; and in-depth calculation methods. Sixteen chapters combine standards and current research, theoretical analysis, and design methods into a practical resource on the analysis and design of prestressed concrete, as well as presenting novel calculation methods and theoretical models of practical use to engineers. - Presents a new approach to calculating prestress losses due to anchorage seating - Provides a unified method for calculating long-term prestress loss - Details cross-sectional stress analysis of prestressed concrete beams from jacking to service - Explains a new calculation method for long-term deflection of beams caused by creep and shrinkage - Gives a new theoretical model for calculating long-term crack width

Download or read book Prestressed Concrete Design written by M.K. Hurst and published by CRC Press. This book was released on 2017-12-21 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fully up to date with the developing Eurocode 2 Worked examples in spreadsheet format Practical and accessible text

Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1974 with total page 1756 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Structural Assessment written by F. K. Garas and published by Butterworth-Heinemann. This book was released on 1987 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes proceedings of a conference in April 1987 organised by the Model Analysis as a Design Tool Study Group of the Institution of Structural Engineers.

Download or read book AASHTO LRFD Bridge Design Specifications Customary U S units written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Special Report Highway Research Board written by National Research Council (U.S.). Highway Research Board and published by . This book was released on 1962 with total page 1004 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Phase II Evaluation Findings The Segmental Concrete Channel Bridge System written by Highway Innovative Technology Evaluation Center (U.S.) and published by ASCE Publications. This book was released on 2000-01-01 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: Prepared by the Highway Innovative Technology Evaluation Center (HITEC), a CERF Innovation Center. This report represents the second component of the HITEC technical evaluation of the J. Muller International Channel Bridge, a precast segmental overpass bridge system intended for use in either bridge replacement projects or new construction. This report describes a full-scale demonstration of the technology. The evaluation was conducted based on the technical evaluation plan developed in June 1995 and follows the technical analyses and evaluation of design attributes and performance history, with emphasis on the unique aspects of this technology.