Download or read book Load Distribution Study on Three Span Continuous Slab Bridge Model Under Cyclic Loading written by Daniel D. Strand and published by . This book was released on 1987 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis of Load Distribution in Continuous Slab Bridges Under Cyclic Loads Using Finite Element Method written by Rana Gupta and published by . This book was released on 1987 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Load Distribution and Rating Assessment of Variable Depth Continuous Slab Bridges written by Ahmadudin Burhani and published by . This book was released on 2021 with total page 261 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many in-service reinforced concrete slab bridges in the United States have thicknesses that change along the span, leading to variation in flexural rigidity. Despite being commonly used, determining their live load carrying capacity has remained routinely uncertain. The variabilities are often ignored, and typical programs, such as AASHTOWare Bridge Rating (BrR), are used to assess such bridges’ structural capacity. In turn, this resulted in the entire analysis being subjected to erroneous results. Moreover, many of these structures are susceptible to weight restrictions due to shortened termination of reinforcements used in the negative moment regions. It is not always clear to which degree the reinforcement length affects such bridges’ structural capacity. It is also uncertain whether other parameters, such as bridge geometry, play role in improving the structural capacity. The objective of this study was to use experimental results and three-dimensional finite element simulations to assess the structural capacity of LOG-47-1184, a concrete highway bridge in Ohio that has four lanes and three consecutive spans of varying thickness and is subject to load restrictions. The study further provides an appropriate development length that satisfies different levels of section variability. The effect of the bridge’s geometry on the reinforcement was investigated. The experimental response of the bridge was determined, and results were used to calculate sets of load rating factors (LRFs) and to validate a three-dimensional finite element model (FEM). A detailed rating analysis found LRFs using the FEM were greater than those from Midas Civil, which in turn were greater than those from the legacy BrR program used by the Ohio Department of Transportation. The ratios of the BrR LRFs to the other procedure were generally constant across multiple test truck load configurations, with less than 4% variation for BrR/Midas Civil and about 25% for BrR/FEM. The LRFs from the FEM satisfied the operating checks and all LRFs exceeded one; therefore, no load restriction posting was required for the bridge. As a result, this study suggests that similar bridges that are susceptible to load restrictions based on the BrR outputs might have adequate structural capacity. Subsequently, it was found that the haunching increased force effects over intermediate supports, which in turn required longer development length. A total reasonable length was determined to be 4L/7, which can be extended on either side of intermediate supports. The FEM simulations underestimated AASHTO LRFD requirements by an average of 40%. Under HL-93 load configurations and using the LRFR approach, all LRFs exceeded one and satisfied the operating rating checks. The LRFs improved by 30% when the skew angle exceeded 15o as compared with 0o and reached 61% with the skew angle of 30o.
Download or read book The Moment Distribution in a Three span Continuous Reinforced Concrete Slab Bridge written by Grant Wilcox Cooke and published by . This book was released on 1955 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Model Study of Lateral Load Distribution on Multi girder Single Span Bridges written by Oswaldo Enrique Palacio Bustillo and published by . This book was released on 1968 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Load Distribution in Concrete Bridge Decks written by Anthony Ralph Cusens and published by . This book was released on 1974 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Load Capacity of Older Continuous Concrete Slab Bridges written by Srinivasa L. Iyer and published by . This book was released on 1987 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Post yield Redistribution of Moments and Analysis Recommendations for Continuous Slab on girder Bridges written by and published by . This book was released on 1990 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of the project reported in this paper, was to obtain a data set of post-yield behaviour of composite slab-on-girder bridges and to study the post-yield redistribution of the longitudinal positive and negative moments. Several experiments were performed to determine the post-yield response of a 1/3 scale three-span continuous composite concrete slab, steel girder bridge model. The bridge had a concrete deck supported by four steel girders. Four different load cases were performed; load cases 1 and 4 applied the loads to an outer girder and load cases 2 and 3 to an inner girder. In load cases 1 and 2 the load was applied to an end span, whilst in load cases 3 and 4 two point loads were applied to the previously unloaded spans and the previously loaded end span was not tied down, thus reducing the bridge to a two span bridge with an overhanging span. Under all load cases, the bridge did not develop either general or local collapse mechanisms. This indicates that the post-yield behaviour can be used to enhance the theoretical load carrying capacity of this type of bridge. Traditional elastic analysis methods of calculating the division of the equilibrium moment into positive and negative moment components are not valid when the flexural stiffnesses are different for positive and negative moments and the negative moments are consequently overestimated. Quasiplastic analysis, ignoring strain compatibility, is more appropriate, using the relevant yield moment at both the positive and negative moment sections was sufficient to permit the sections to develop over 90 percent of the calculated plastic capacities. For the covering abstract of the Conference see IRRD Abstract no. 807839.
Download or read book Load Reduction in Multi lane Concrete Slab Bridges written by Fatima Mohamad El Meski and published by . This book was released on 2007 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: This current research presents the finite-element results of a study investigati ng the effect of multi-presence of design vehicles on three- and four-lane concr ete slab highway bridges. Typical one-span, simply supported, two spans, multil ane (three and four lanes), reinforced concrete slab bridges are considered. The finite-element method is used to investigate the effect of span length and slab width, and to calculate the wheel load distribution on the bridge slab at the c ritical section. Live load reduction factors are proposed by the American Association for State H ighway and Transportation Officials (AASHTO) specifications, due to the improbab ility of maximum coincident loading. These live-load reduction factors are impo sed to account for the probability of having all lanes loaded at the same time a nd at locations along the bridge deck producing the maximum bending moment in an element of a bridge superstructure. AASHTO specifies that results obtained fro m analyses of three- and four-lane bridge decks where all lanes are loaded simul taneously are to be multiplied by proposed reduction factors. This research will investigate the significance of the reduction factors propose d by AASHTO. Design trucks loads are first placed transversally in all lanes as a reference case. Design loads in two out of three, three out of four, and two out of four lanes are then investigated. The wheel load distribution on the bri dge slab at the critical section for the fully loaded and reduced conditions are calculated and compared. The results are assessed with AASHTO procedures, and a correlation between the reduced conditions and the AASHTO 10% and 25% reductio n factors is made. This research will assist bridge engineers in quantifying the adjustment factors used in analyzing and designing multilane concrete slab bridges.
Download or read book Influence of Load Reduction in Multi lane Bridges written by Imad Youssef Naddaf and published by . This book was released on 1998 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis investigates the behavior of multi-lane steel girder bridues subject to reduced loading using the finite element method The most critical behavior of a highway bridge is thought to result from a fully loaded bridge (live load on all lanes) It is a common practice to apply reduction factors for bridges with more than two lanes These reduction factors are to account for the probability that all lanes be loaded at the same time Therefore, this study will investigate these reduction factors by analyzing three-lane and four-lane steel girder bridges fully loaded, two out of three-lanes, and three out of four-lanes loaded bridges The behavior of these bridges will be investigated by studying the effect of load removal on the lateral wheel load distribution factor The results of this study w ill be used to assess the empirical reduction factors currentK employed by the American .Association of State Highway and Transportation Officials (AASHTO) "Standard Specifications for Highway Bridges (19%) ".--This study will consider critical parameters identified in previous research such as simple (one-span), and continuous (two-span), girder spacing, span length, three-lane bridges and four-lane bridges The finite element method is proposed to analyze the steel girder bridges by using the structural analysis program SAP90 The research will focus on evaluating the maximum lateral wheel load distribution to the steel girders subject to the full (all lanes are loaded) and reduced (bridge partially loaded) design live loading Bridges will be loaded using AASHTO design taicks positioned in the longitudinal direction in order to produce either the maximum positive and/or the maximum negative bending moments.
Download or read book Distribution of Wheel Loads and Design of Reinforced Concrete Bridge Floor Slabs written by H. R. Erps and published by . This book was released on 1937 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Study of a Three Span Continuous Bridge Structure written by Conrad P. Heins and published by . This book was released on 1968 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Concrete Abstracts written by and published by . This book was released on 1987 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transactions of the American Society of Civil Engineers written by American Society of Civil Engineers and published by . This book was released on 1997 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vols. 29-30 include papers of the International Engineering Congress, Chicago, 1893; v. 54 includes papers of the International Engineering Congress, St. Louis, 1904.
Download or read book Load Distribution in a Two span Continuous Bridge written by M. K. Elnahal and published by . This book was released on 1989 with total page 285 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 1965 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book HRIS Abstracts written by National Research Council (U.S.). Highway Research Board and published by . This book was released on 1987 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt:
