Download or read book Live Load Distribution Factors for Exterior Girders in Steel I girder Bridges written by Gregory K. Michaelson and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Single Lane Live Load Distribution Factor for Decked Precast prestressed Concrete Girder Bridges written by John Zhongguo and published by . This book was released on 2005 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: The live load distribution factor (DF) equations provided by AASHTO-LRFD for the decked precast/prestressed concrete (DPPC) girder bridge system do not differentiate between a single or multilane loaded condition. This practice results in a single lane load rating penalty for DPPC girder bridges. The objective of this project is to determine DF equations which accurately predict the distribution factor of the DPPC girder bridge system when it is only subjected to single lane loading. Eight DPPC girder bridges were instrumented. Each bridge was loaded with a single load vehicle to simulate the single lane loaded condition. The experimental data was used to calibrate 3D FE models and 2D grillage models of the DPPC girder bridge system. The calibrated models were used to conduct a parametric study of the DPPC girder bridge system subjected to a single lane loaded condition. Two sets of new equations that describe the single lane loaded distribution factor for both shear and moment forces of these bridges are proposed and compared with AASHTOLRFD DF equations.
Download or read book An Investigation of the Load Distribution on a Timber Deck steel Girder Bridge written by Marvin Henry Hilton and published by . This book was released on 1975 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: The load distribution on a 48.5-ft. span timber deck-steel girder bridge built to the Virginia Department of Highways and Transportation standard SS-4 requirements was investigated under two conditions. The first condition was concerned with the load distribution when the timber deck fasteners were tight and the second condition involved investigating the load distribution when the fasteners were loosened in several stages. The results of the study indicated that the live load stresses were of the same general order of magnitude and that the lateral load distribution was generally the same whether the deck plank fasteners were loose or tight. The load distribution factor currently used for the interior girders was found to be too high, whereas the procedure used for distribution of the load to the exterior girders was slightly low. It is recommended that consideration be given to using a load distribution factor of S for the evaluation of both the interior and exterior girders of timber deck-steel girder bridges similar to the one investigated. Compared to current procedures, this modification would result in a 20% reduction in the live load distribution to the interior girders and a 28% increase in the distribution to the exterior girders.
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 Finite Element Analysis of Splayed Steel Girder Bridges written by Faress Hraib and published by . This book was released on 2015 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: "A splayed girder bridge is a bridge which consists of a deck slab supported on girders with linearly varying spacing. The simple formulas and approximate design procedures in the AASHTO LRFD Bridge Design Specifications are supposed to be used with regular bridges, where the girders are parallel and the deck slab width is constant. For splayed girder bridges, the specifications suggest a refined method of analysis, which could be expensive and time-consuming. Extending the simple live load girder distribution factors and the deck slab strip method to splayed girder bridges would be very helpful for bridge designers. The objective of this research is to investigate the effect of girder splayedness in slab-on-steel-girder bridges on the dead and live load distribution in the deck slab as well as among the interior and exterior girders. Fifteen composite steel girder bridges are analyzed by the finite element method using the computer software ANSYS. In the computer model, 4-node rectangular shell elements were used for the steel girder flanges and web, 2-node beam elements for the cross-bracing, and 8-node solid elements in the deck slab. Linearly-elastic material behavior is utilized and the model is verified against laboratory and field tests of actual bridges. The effects of the girder splayedness angle, girder spacing, number of girders, deck slab thickness, span length, girder stiffness, and presence of cross-bracing are considered. The study showed that the tributary width concept is reliable for determining the dead load on the splayed girders. Also, the girder distribution factors for flexure in the AASHTO LRFD specifications can be reasonably used for splayed girder bridges if the specific girder spacing at the location of each axle of the truck in the longitudinal direction is considered. On the other hand, the lever rule can provide a good estimate of the live load distribution among splayed girders when subjected to shear. With regard to the live and dead load effect in the deck slab, the equivalent strip method can be a reasonable predictor of the critical positive and negative bending moments in the slab interior regions and in the overhang, provided more than one strip are taken at some discrete locations along the bridge centerline. "--Abstract.
Download or read book Live Load Distribution in Multi cell Box Girder Bridges and Its Comparison with the AASHTO LRFD Bridge Design Specifications written by Shin-Tai Song and published by . This book was released on 2001 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Live Load Spectra for Girder Bridges written by Hani Hamad Nassif and published by . This book was released on 1993 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Live Load Distribution Factors in Two girder Bridge Systems Using Precast Trapezoidal U girders written by Salahudin Mensah and published by . This book was released on 2010 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Live Load Distribution Factor Comparison for a Curved Steel Box Girder Bridge written by Cory E. Schultz and published by . This book was released on 2010 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book LRFD Guide Specifications for the Design of Pedestrian Bridges written by American Association of State Highway and Transportation Officials and published by AASHTO. This book was released on 2009 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Distribution of Girder Loads in a Composite Highway Bridge written by Clifford Wagner Elling and published by . This book was released on 1985 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Simplified LRFD Bridge Design written by Jai B. Kim and published by CRC Press. This book was released on 2013-04-08 with total page 349 pages. Available in PDF, EPUB and Kindle. Book excerpt: Helping readers prepare for the civil and structural PE exam, this book presents numerous design examples that serve as a comprehensive, step-by-step guide to basic bridge design using the AASHTO LRFD Bridge Design Specifications, Fifth Edition. It offers a simplified explanation of load resistance factor design (LRFD) method-based bridge design principles and lists the AASHTO reference section numbers alongside formulas and where topics are introduced, to refer the reader to the primary source material. This is a valuable reference for civil engineering students as well as for practicing engineers.
Download or read book Bridge Analysis Simplified written by Baidar Bakht and published by McGraw-Hill Companies. This book was released on 1985 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Comparison of AASHTO Bridge Load Rating Methods written by Mark Mlynarski and published by Transportation Research Board National Research. This book was released on 2011 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: TRB’s National Cooperative Highway Research Program (NCHRP) Report 700: A Comparison of AASHTO Bridge Load Rating Methods documents an analysis of 1,500 bridges that represent various material types and configurations using AASHTOWareTM Virtis® to compare the load factor rating to load and resistance factor rating for both moment and shear induced by design vehicles, American Association of State Highway and Transportation Officials (AASHTO) legal loads, and eight additional permit/legal vehicles.
Download or read book Challenges Opportunities and Solutions in Structural Engineering and Construction written by Nader Ghafoori and published by CRC Press. This book was released on 2009-10-29 with total page 1890 pages. Available in PDF, EPUB and Kindle. Book excerpt: Challenges, Opportunities and Solutions in Structural Engineering and Construction addresses the latest developments in innovative and integrative technologies and solutions in structural engineering and construction, including: Concrete, masonry, steel and composite structures; Dynamic impact and earthquake engineering; Bridges and
Download or read book Simplified Live Load Distribution Factor Equations written by BridgeTech, Inc and published by Transportation Research Board. This book was released on 2007 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report contains the findings of research performed to develop recommended Load and Resistance Factor Design (LRFD) live load distribution factor design equations for shear and moment. The report details the development of equations that are simpler to apply and have a wider range of applicability than current methods. The appendices are not published in this report, but are available online at http://www.trb.org/news/blurb_detail.asp?id=7938.
Download or read book Development of Live Load Distribution Factor Equations for Girder Bridges written by Nakin Suksawang and published by . This book was released on 2006 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
