Download or read book On Load Distribution Factors in Continuous Slab girder Bridges written by Jin H. Wang and published by . This book was released on 1998 with total page 178 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 A Comparison of AASHTO Bridge Load Rating Methods written by Mark Mlynarski and published by Transportation Research Board. 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 Load Factor Design of Continuous Composite Concrete Slab steel Girder Bridges written by Alan Drew Kurzweil and published by . This book was released on 1974 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Behavior of Concrete Slab and Girder Bridges written by Edgar V. Leyendecker and published by . This book was released on 1969 with total page 240 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 Effects of Diaphragms in Continuous Slab and Girder Highway Bridges written by Albert Yao Chee Wong and published by . This book was released on 1973 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Live Load Factors for Continuous Girder Bridges written by Qing Wang and published by . This book was released on 2016 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Monitoring and Load Distribution Study for the Land Bridge written by Alireza Ghorbanpoor and published by . This book was released on 2010 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Effective Slab Width for Composite Steel Bridge Members written by Stuart S. Chen and published by Transportation Research Board. This book was released on 2005 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: TRB's National Cooperative Highway Research Program (NCHRP) Report 543: Effective Slab Width for Composite Steel Bridge Members examines recommended revisions to the American Association of State Highway and Transportation Officials' specifications for the effective slab width of composite steel bridge members. The report's recommended specifications are applicable to all types of composite steel bridge superstructures and are suitable for design office use. Accompanying CRP-CD-56 contains extensive supporting information, including the recommended specifications and design examples.

Download or read book Distribution of Wheel Loads on Highway Bridges Phase Three written by Toorak Zokaie and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: NCHRP Projects 12-26 and 12-26/1 focused on the development of simplified wheel load distribution criteria for five common bridge types -- namely slab on girder, slab, box girder, spread box beam, and multibox beam. As part of the project 12-26/1 (Phase II) a Level-2 method was also recommended which consisted of a grillage analysis. Although several computer programs are available for grillage analysis, model preparation, load placement, and calculation of wheel load distribution factors is still a major task and may be a prohibitive factor for the engineers who are not fluent in computer aided structural analysis. Therefore, the development of a user friendly computer program for calculation of wheel load distribution factors based on a grillage analysis was taken. This program would also be useful as bridge engineers begin to implement the new Load and Resistance Factor Design (LRFD) specifications. This computer program, LDFAC, is capable of computing wheel load distribution factors at any user-defined location for calculation of shear or moment. Single and multiple span (continuous) bridges may be specified. The distribution factor can be for an HS20 or any other truck. Special load configurations may be specified by the user as well. The supports (abutments and bents) may be normal or skewed, and distribution factors are calculated for both single and multiple lane loadings. Additionally, the equations obtained in Phase II of this project have been incorporated into the software. The output tables present the results of these formulas for comparison. LDFAC presents a rigorous method for calculation of wheel load distribution factors for several bridges and loadings where simple formulas are not available or applicable. The factors obtained from LDFAC can be directly incorporated into the current design procedure, providing added accuracy without complicating the design process.

Download or read book Integrated Numerical and Field Approachs to Improve Bridge Designs written by Inmar Badwan and published by . This book was released on 2005 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Bridge design codes provide a set of technical requirements for safe and acceptable design. However, several design requirements need evaluation and field verification to asses their accuracy. Those associated with the full-depth shear key joints in multi-beam decks, load distribution in highly skew continuous bridges, and permit load bridge rating are reviewed in the context. Multi-beam decks can be made by precast units that are post-tensioned together with shear keys and transverse post-tensioning. The performance of the longitudinal joints with regards to load transfer and water tightness is one of the design features of interest. To transfer load between the adjacent units, the joints are filled with grout material. The transverse post-tensioning stress is employed to prevent excessive opening of these joints. Live load tests on multi-beam bridge were performed to obtain actual load distribution data. The study presents the test results and an associated finite element analyses. A simplified method based upon grillage analogy is developed to quantify required transverse post-tensioning stresses in the longitudinal joints. The efficiency of the joints was evaluated by comparing with a hypothetical monolithic slab structure and by the distribution of loads in the transverse direction. The post-tensioning stresses as calculated according to the method were compared with the requirements of the AASHTO LRFD provisions. Estimation of the span and support moment is required to develop a realistic design for skew continuous bridges. Distribution factors recommended by the code provide convenience and simplistic methods to calculate the moments on bridge girders. Refined formulas for estimating the load distribution factors are provided in the current AASHTO LRFD Bridge Design Specifications. A considerable amount of literature is available on field verification studies of right angle steel girder bridges; however studies on highly skew bridges are relatively limited. Previous studies on highly skew bridges have verified the distribution characteristics either analytically or experimentally using prototype bridges. The current study presents a live load field test carried out on a 60-degree skew three-span continuous steel girder bridge. The results are used to derive quantitative information regarding the actual transverse load distribution characteristics of the bridge to asses the accuracy of the current methods. To account for the application of overloads, the LRFR permit load rating was modified by introducing the fatigue damage of overloads. The study used a modification factor referred to as the fatigue index to point to the damage causing effect of overloads. A method is developed to calculate the modification factor. The method considers the fatigue damage that may be caused by overloads as well as the stresses induced by normal traffic. The approach assumes that fatigue index for a specific overload is proportional to the total number of stress cycles required to increase the crack size to the crack threshold at stress induced by normal traffic. The number represents the overload stress cycles that would produce a crack size at which normal traffic stress cycle is able to contribute to the crack growth. The fatigue index as determined by the method reflects the severity of an overload and its potential for causing fatigue damage."--P. iii-iv.

Download or read book Bridge Superstructure written by N. Rajagopalan and published by Alpha Science International, Limited. This book was released on 2006 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bridge Superstructure deals with the behaviour of different types of bridge decks under different systems of loading. Mathematical modeling and the behaviour of different types of bridge decks are clearly explained. Solid slab, voided slab and skew slab bridge decks are detailed out for analysis and design. Box girder bridges is specially discussed for better understanding of its behaviour and its design. Special points relating to creep and shrinkage effects in continuous bridge decks are explained. Bridge bearings, expansion joints and appurtenances of different types are explained with respect to their place of use and their functions. A few methods of erection of bridge decks of simply supported spans or continuous spans are presented to give a good understanding of such possibilities.

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 Inelastic Rating Procedures for Steel Beam and Girder Bridges written by Theodore V. Galambos and published by Transportation Research Board. This book was released on 1993 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: