Download or read book Lateral Impact Response for Prestressed Concrete Girder Bridges with Intermediate Diaphragms written by Bassem Onsi Andrawes and published by . This book was released on 2001 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: Each model was analyzed with either one RC or two different types of steel intermediate diaphragms. The bridge models were analyzed for a lateral impact load applied at different locations along the bottom flange of an exterior girder. A comparison was made between the induced strains and displacements in the girders for each diaphragm case. This study revealed that intermediate diaphragms have an effect on reducing girder damage in PC girder bridges. When a lateral impact load was applied at a diaphragm location, the RC diaphragm provided more damage protection for the girders than that provided by either of the two selected steel diaphragms. The three types of diaphragms studied essentially provided the same degree of damage protection when a lateral impact load was applied away from a diaphragm location.
Download or read book Lateral Load Resistance of Diaphragms in Prestressed Concrete Girder Bridges written by R. E. Abendroth and published by . This book was released on 1991 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: Each year several prestressed concrete girder bridges in Iowa and other states are struck and damaged by vehicles with loads too high to pass under the bridge. Whether or not intermediate diaphragms play a significant role in reducing the effect of these unusual loading conditions has often been a topic of discussion. A study of the effects of the type and location of intermediate diaphragms in prestressed concrete girder bridges when the bridge girder flanges were subjected to various levels of vertical and horizontal loading was undertaken. The purpose of the research was to determine whether steel diaphragms of any conventional configuration can provide adequate protection to minimize the damage to prestressed concrete girders caused by lateral loads, similar to the protection provided by the reinforced concrete intermediate diaphragms presently being used by the Iowa Department of Transportation. The research program conducted and described in this report included the following: A comprehensive literature search and survey questionnaire were undertaken to define the state-of-the-art in the use of intermediate diaphragms in prestressed concrete girder bridges. A full scale, simple span, restressed concrete girder bridge model, containing three beams was constructed and tested with several types of intermediate diaphragms located at the one-third points of the span or at the mid-span. Analytical studies involving a three-dimensional finite element analysis model were used to provide additional information on the behavior of the experimental bridge. The performance of the bridge with no intermediate diaphragms was quite different than that with intermediate diaphragms in place. All intermediate diaphragms tested had some effect in distributing the loads to the slab and other girders, although some diaphragm types performed better than others. The research conducted has indicated that the replacement of the reinforced concrete intermediate diaphragms currently being used in Iowa with structural steel diaphragms may be possible.
Download or read book Steel Diaphragms in Prestressed Concrete Girder Bridges written by Robert Emil Abendroth and published by . This book was released on 2004 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Intermediate Diaphragms to Prestressed Concrete Bridge Girders in Over height Truck Impacts written by Pizhong Qiao and published by . This book was released on 2008 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lateral Load Resistance of Diaphragms in Prestressed Concrete Girder Bridges written by Mark Wayne Shafer and published by . This book was released on 1994 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lateral load resistance of diaphragms in prestressed concrete girder bridges written by and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Prestress Losses in Pretensioned High strength Concrete Bridge Girders written by Maher K. Tadros and published by Transportation Research Board. This book was released on 2003 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The HCM includes three printed volumes (Volumes 1-3) that can be purchased from the Transportation Research Board in print and electronic formats. Volume 4 is a free online resource that supports the rest of the manual. It includes: Supplemental chapters 25-38, providing additional details of the methodologies described in the Volume 1-3 chapters, example problems, and other resources; A technical reference library providing access to a significant portion of the research supporting HCM methods; Two applications guides demonstrating how the HCM can be applied to planning-level analysis and a variety of traffic operations applications; Interpretations, updates, and errata for the HCM (as they are developed);A discussion forum allowing HCM users to ask questions and collaborate on HCM-related matters; and Notifications of chapter updates, active discussions, and more via an optional e-mail notification feature."--Publisher.
Download or read book Assessing the Needs for Intermediate Diaphragms in Prestressed Concrete Bridges written by Steve Cai and published by . This book was released on 2008 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Diaphragms in Prestressed Concrete Girder and Slab Bridges written by S. Sengupta and published by . This book was released on 1973 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Strength and Stability of Prestressed Concrete Through girder Pedestrian Bridges Subjected to Vehicular Impact written by Eray Baran and published by . This book was released on 2007 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two issues regarding the prestressed concrete through-girder pedestrian bridge system are investigated. The first issue concerns the ductility of prestressed concrete girders in these bridges because the section that is typically used may be considered to be over-reinforced according to AASHTO LRFD Bridge Specifications. Response of the section, including neutral axis location, strand stress at ultimate capacity, and moment capacity, predicted by AASHTO Standard and AASHTO LRFD Specifications are compared with the sectional response determined from nonlinear strain compatibility analyses. Modifications are proposed to the AASHTO LRFD procedure to rectify the errors in predicting sectional response. The second issue that was investigated concerns the strength and stability of prestressed concrete through-girder pedestrian bridges when subjected to impact by over-height vehicles. Three-dimensional finite element models of entire bridges and subassemblages were used to evaluate the strength, stiffness, and ductility characteristics of the bridge system and connection details. Accurate representation of the bridge details in the finite element models were assured by utilizing experimentally determined load-deformation characteristics for the connections. Results showed that significant improvements in the lateral load-deflection behavior of the bridge system could be obtained by implementing alternate connection schemes, and that concrete side-walls should be provided at girder ends.
Download or read book Effects of Diaphragms in Bridges with Prestressed Concrete I section Girders written by S. Sithichaikasem and published by . This book was released on 1972 with total page 287 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Diaphragms in Skew Prestressed Concrete Box Girder Bridges microform written by Gamal Abdel-Aziz Mohamed Ghoneim and published by National Library of Canada. This book was released on 1986 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Barrier Joint and Diaphragm Effects on Force Distribution in Prestressed Concrete Girder Bridges written by Jonathan Darren Chipperfield and published by . This book was released on 2010 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: The purpose of this research was to create two finite element models (FEM) using ANSYS 11.0 and calibrate them to the measured test results. After the calibrated models were validated a parametric study was performed comparing the effects of secondary elements on live load distribution. Included in this parametric study are the effects of the barrier, the barrier joint, and the diaphragms, on the girders, both interior and exterior. The results of this project show the effects of secondary elements and whether they are localized or global on the longitudinal span of the bridge, as well as tell how the live load is being distributed. Also, for load testing, recommendations on placement of strain gages will be discussed.
Download or read book Recommended Practice for Lateral Stability of Precast Prestressed Concrete Bridge Girders written by and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental and Analytical Investigations of the Thermal Behavior of Prestressed Concrete Bridge Girders Including Imperfections written by Jonghang Lee and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental and analytical study was conducted on a BT-63 prestressed concrete girder to investigate the thermal effects on the girder. A 2D finite element heat transfer analysis model was then developed which accounted for heat conduction, convection, radiation, and irradiation. The solar radiation was predicted using the location and geometry of the girder, variations in the solar position, and the shadow from the top flange on other girder surfaces. The girder temperatures obtained from the 2D heat transfer analysis matched well with the measurements. Using the temperatures from the 2D heat transfer analysis, a 3D solid finite element analysis was performed assuming the temperatures constant along the length of the girder. The maximum vertical displacement due to measured environmental conditions was found to be 0.29 inches and the maximum lateral displacement was found to be 0.57 inches. Using the proposed numerical approach, extremes in thermal effects including seasonal variations and bridge orientations were investigated around the United States to propose vertical and transverse thermal gradients which could then be used in the design of I-shaped prestressed concrete bridge girders. A simple beam model was developed to calculate the vertical and lateral thermal deformations which were shown to be within 6% of the 3D finite element analyses results. Finally, equations were developed to predict the maximum thermal vertical and lateral displacements for four AASHTO-PCI standard girders. To analyze the combined effects of thermal response, initial sweep, and bearing support slope on a 100-foot long BT-63 prestressed concrete girder, a 3D finite element sequential analysis procedure was developed which accounted for the changes in the geometry and stress state of the girder in each construction stage. The final construction stage then exposed the girder to thermal effects and performed a geometric nonlinear analysis which also considered the nonlinear behavior of the elastomeric bearing pads. This solution detected an instability under the following conditions: support slope of 5¡©6 and initial sweep of 4.5 inches.
Download or read book USER Manual for Calculating the Lateral Stability of Precast Prestressed Concrete Bridge Girders written by Precast and published by . This book was released on 2020-05-30 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: USER Manual for Calculating the Lateral Stability of Precast, Prestressed Concrete Bridge Girders, CB-04-20, provides context and instructions for the use of the 2019 version of the Microsoft Excel workbook to analyze lateral stability of precast, prestressed concrete bridge products. The free distribution of this publication includes a simple method to record contact information for the persons who receive the workbook program so that they can be notified of updates or revisions when necessary. There is no cost for downloading the program. This product works directly with the PCI document entitled Recommended Practice for Lateral Stability of Precast, Prestressed Concrete Bridge Girders, PCI publication CB-02-16, which is referenced in the AASHTO LRFD Bridge Design Specification. To promote broader use of the example template, PCI developed a concatenated Microsoft Excel spreadsheet program where users may customize inputs for a specific component design according to regional girder products.
