Download or read book Testing of a Trapezoidal Box Girder Bridge written by Michael Holowka and published by . This book was released on 1979 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Edward Hillyer written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Composite Action During Construction of Steel Trapezoidal Box Girder Bridges written by and published by . This book was released on 2005 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: In steel trapezoidal box girder bridge systems, the U-shaped steel girder is designed to act compositely with the concrete deck to form a closed box for live loading. During the construction stage, however, the behavior is not well understood. The usual practice of assuming the system to be non-composite during construction requires substantial top flange bracing to form a quasi-closed box section. Composite box girders with live loading, and girders during construction, have to be evaluated during the design of curved steel trapezoidal box girder bridges. Considering both cases, the design for construction loading is the least understood and is the most important. Stresses due to construction loading can reach up to 60-70 percent of the total design stress for a given cross section. A three-phase study was undertaken to investigate the behavior of curved trapezoidal box girders during construction.
Download or read book Simplified Methods of Evaluating the Redundancy of Twin Trapezoidal Box Girder Bridges written by Vasileios Samaras and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: According to the AASHTO Load and Resistance Factor Design (LRFD) Bridge Design Specifications, a bridge is defined to be fracture critical when a failure of a tension component will result in the collapse of the bridge. In the case of a twin box girder bridge, the tension flanges in the positive moment portion of the bridge, as well as the webs, are considered to be fracture critical elements. Due to this classification, those bridges are subjected to stringent inspections at least every two years. Those inspections are crucial for ensuring the safety of the bridge, yet are expensive and time consuming. Multiple cases of FCBs (Fracture Critical Bridge) that have experienced a fracture in one of their elements without collapse have encouraged owners of those bridges to question the validity of AASHTO's requirements. The Texas Department of Transportation is interested in indentifying when a fracture of an element could lead to a catastrophic collapse of a bridge. A better understanding of fracture critical bridge behavior may allow TxDOT and other state DOTs to reduce the frequency of the inspections, which could potentially reduce the cost of an otherwise attractive bridge design. The goal of this research project is to determine the level of redundancy of twin box girder bridges. Simplified analytical methods and guidelines that will conservatively estimate the behavior of such bridges will be presented in this thesis. Those guidelines will be one of the tools that an engineer in practice could use to determine if a bridge is prone to collapse following the failure of a fracture critical component. A full-size bridge has been constructed at the Ferguson Structural Engineering Laboratory to test the response of these systems following a simulated fracture. A series of tests were conducted to determine the response of the bridge in the event of a tension flange fracture. The results provided important information for the development of the simplified methods. The FSEL test bridge performed extremely well throughout all the testing and supported a load of over four times the AASHTO design truck load. Several elements contributed to create alternative load paths that could sustain the entire applied load with a full-depth fracture of one of its two girders. The large section of the concrete railing above the fractured girder acted as an inverted beam and transmitted a portion of the load back to the supports once the expansion joint closed due to the downward deflection of the bridge. The concrete deck acted as a shear diaphragm and also transferred significant loads in both horizontal directions. Because the performance of the test bridge far exceeded the AASHTO criteria, and because this behavior can be computed using the simplified methods presented in this thesis as well as through detailed finite element models, consideration should be given to revising the current AASHTO specifications and to developing alternate inspection and maintenance requirements that accurately reflect the redundancy available in various types of fracture critical bridges.
Download or read book A Design Procedure for Intermediate External Diaphragms on Curved Steel Trapezoidal Box Girder Bridges written by Matthew Alex Memberg and published by . This book was released on 2002 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Steel Box Girder Bridges written by and published by Thomas Telford Publishing. This book was released on 1973 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Shear Performance of ASR DEF Damaged Prestressed Concrete Trapezoidal Box Bridge Girders written by Tz-Wei Wang and published by . This book was released on 2010 with total page 690 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concrete bridges in Texas have developed large cracks in bent caps and pretensioned trapezoidal bridge girders. The bridges show premature concrete deterioration due to alkali-silica reaction (ASR) and delayed ettringite formation (DEF). There is concern that deterioration due to ASR/DEF may lead to a loss of structural capacity. However, there are no quantitative guidelines to relate the level of concrete deterioration due to ASR/DEF to structural performance. Using such guidelines, the need for rehabilitation of beams with ASR/DEF cracking can be assessed. The goal of this research was to determine the shear capacity of pretensioned trapezoidal box girder specimens exhibiting varying degrees of ASR and/or DEF cracking and to use the shear testing results to evaluate the severity of the problem that may exist in Texas bridge structures. To achieve this goal, beams that were severely deteriorated due to ASR/DEF over a period of more than ten years were transported to the University of Texas for testing to failure. Both severely deteriorated and uncracked beams were tested in shear. The test results were used to evaluate the shear performance of trapezoidal box beams affected by ASR/DEF. In addition, three different types of forensic analyses were conducted on the beams to understand the nature of the ASR/DEF cracks and severity of the deterioration. After testing, it is found that the shear capacity of the test specimens was not significantly reduced even with heavy ASR/DEF cracking. Assessment using current US design provisions for bridges or buildings (ACI 318-08 and AASHTO LRFD 2008) and the proposed provision from an earlier project (TxDOT Project 5253) yielded conservative estimates of strength. Results from forensic analyses provided a qualitative indication of ASR/DEF damage but did not correlate with the observed levels of ASR/DEF deterioration.
Download or read book Design Guidelines for Steel Trapezoidal Box Girder Systems written by and published by . This book was released on 2007 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book In situ Monitoring and Testing of IBRC Bridges in Wisconsin written by and published by . This book was released on 2010 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NCHRP Report written by and published by . This book was released on 1964 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Top lateral Bracing Systems for Trapezoidal Steel Box girder Bridges written by Brian S. Chen and published by . This book was released on 2003 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental and Theoretical Investigation of a Composite Trapezoidal Box Girder Bridge written by George Sobol and published by . This book was released on 1973 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis of Distortion induced Fatigue Cracking in a Steel Trapezoidal Box Girder Bridge written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In 2006, a consulting firm was hired to perform an in-depth interior box inspection on Delaware Department of Transportation (DelDOT) Bridge Number 1-501, also known as the Newport Viaduct. Upon inspection, 655 fatigue cracks were observed, occurring at the weld metal between the transverse cross frame connection plate and girder webs. At the cracked locations, a 2.5 in. web gap exists between the connection plate termination and the girder flanges. This is a known fatigue prone detail that has been widely documented to be susceptible to out-of-plane deformation and distortion-induced fatigue. Although the mode of cracking is relatively familiar, there are remaining questions that should be answered to ensure the proper functioning of the structure. Specifically, is the observed fatigue cracking consistent with expected behavior? Secondly, should additional cracks be expected to initiate in locations that currently do not have observable cracks? These questions were approached by focusing on a portion of the overall structure, Spans 9-11 in the southbound direction. Field testing was performed to capture the in-situ response of the structure to known live loads via the implementation of 23 strategically placed strain transducers. The field testing was used to calibrate and validate a finite element model. The finite element mesh was constructed using the FEMAP preprocessor and solved using ABAQUS. Sensitivity analyses were performed on the model to investigate the influence of the transverse truck position within the travel lane, the concrete deck stiffness, and the concrete parapets. The results of each analysis showed that the finite element model was insensitive to variations in transverse truck position, concrete stiffness, and the exclusion of the parapets. The finite element model was ultimately utilized to perform a fatigue evaluation. The fatigue evaluation showed that fatigue cracking is within reason given the stress range and the number of accumulated stress cycles from lifetime truck traffic on the structure. The fatigue evaluation and anticipation of future cracking establishes the need for developing crack retrofit and mitigation strategies for the web gap details within the structure. These strategies will extend the longevity of the bridge and enable it to remain in service.
Download or read book Field and Computational Studies of Steel Trapezoidal Box Girder Bridges written by Zhanfei Fan and published by . This book was released on 1999 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1973 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Steel Concrete Composite Structures written by R. Narayanan and published by CRC Press. This book was released on 1988-12-31 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a collection of ten extensive review chapters by different authors.
Download or read book Loading Tests on the Stiffened Diaphragms of a Trapezoidal Steel Box Girder written by C. A. K. Irwin and published by . This book was released on 1978 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
