› › Finite Element Analysis Of Simple And Continuous Multilane Bridges

Finite Element Analysis of Simple and Continuous Multilane Bridges

Author : Abbas Maarouf Kesserwan

Publisher :

Page : 214 pages

File Size : 40,67 MB

Release : 1996

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ISBN :

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Book Description

In the design of highway bridges, structural engineers are faced with the determination of realistic lateral load distribution on steel girders. AASHTO Bridge Specifications contains a simple procedure used in the analysis and design of steel girder bridges. This procedure consists of calculating the maximum bending moment in an isolated individual girder under the application of a wheel line load (from a design truck load), and then multiplying the corresponding moment by an empirically derived distribution factor. In a previous study conducted by Mabsoul et al. (1996). a typical one-span two-lane composite steel girder bridge was analyzed using the finite clement method. Four finite element meshes were tested, of which two were selected for further analyses. A parametric study was performed for a wide variety of span lengths and girder spacings. which were thought to primarily affect the wheel load distribution (Tarhini et al. 1992). This study, which served to assess current design procedures (AASHTO 1992 and 1994). was limited to single-span two-lane bridges only. In the proposed research, the finite element analysis is extended to simple and continuous multi-lane steel girder bridges. The analysis will consider simple (one-span) and two-span bridges with two. three, and four lanes. This study will focus on the determination of the lateral wheel load distribution factor on the girders. Typical steel girder bridges will be discretized and analyzed by the finite element method for a variety of span lengths and girder spacings. Bridges will be loaded by AASHTO design trucks. The position of the truck will be varied along both the longitudinal and lateral directions to produce maximum positive and negative moments in the girders. The finite clement structural program SAP90 (1992) will be used. The proposed research will present a comprehensive study of straight steel girder bridges. It will therefore assist structural engineers in the analysis of simple and continuous multi-lane bridges. The finite element analysis will present an accurate approach for the evaluation of the load-earn ing capacity of existing or new bridges, and will serve to assess approximate methods currently used in bridge design practice.



Influence of Load Reduction in Multi-lane Bridges

Author : Imad Youssef Naddaf

Publisher :

Page : 296 pages

File Size : 40,71 MB

Release : 1998

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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.





Moving Loads - Dynamic Analysis and Identification Techniques

Author : Siu-Seong Law

Publisher : CRC Press

Page : 332 pages

File Size : 30,88 MB

Release : 2011-02-18

Category : Technology & Engineering

ISBN : 0203841425

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Book Description

The interaction phenomenon is very common between different components of a mechanical system. It is a natural phenomenon and is found with the impact force in aircraft landing; the estimation of degree of ripeness of an apple from impact on a beam; the interaction of the magnetic head of a computer disk leading to miniature development of modern c



Experimental Investigation and Finite Element Nonlinear Analysis of Continuous Composite Curved Multi-cell Box-girder Bridges

Author : GuoQiang Xi

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Page : 0 pages

File Size : 40,86 MB

Release : 1999

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Book Description

Studies on ultimate limit states and nonlinear behaviors of bridges will greatly enhance the understanding of bridge engineers on the moment and shear distribution and the general performance of bridges under load. Described herein is an experimental and theoretical investigation of ultimate loads and nonlinear behaviors of two-span continuous composite curved multi-cell box-girder bridges with a single column as middle support and subjected to OHBDC design truck loadings. The curved bridges are modeled by using the finite element methods. The deck slab, webs, the bottom plate and diaphragms are modeled by 4-node shell elements while the shear connectors and the single middle column are modeled by 3-D beam elements. The existing software COSMOS/M is used for the analysis. A model test of a two-span continuous composite curved multi-cell box-girder bridge with a single column at the middle support is conducted to verify the finite element method. Idealized bridges with different parameters are also studied. Consideration is given to many of the variables that significantly influence ultimate loads and nonlinear behaviors of such bridges. Several rational suggestions are made to enhance the design of two-span continuous composite curved four-cell box-girder bridges.









Finite Element Analysis of Concrete Solid Slab Bridges

Author : Rami Ibrahim Jabakhanji

Publisher :

Page : 216 pages

File Size : 24,66 MB

Release : 1999

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ISBN :

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Book Description

This report presents an investigation of the behavior of simply supported, multi-lane, reinforced concrete solid slab bridges using the finite element method. Solid slab bridges have a behavior pattern that falls between one-way slab behavior and two-way slab behavior. Geometric parameters such as: span length, thickness of slab, number of lanes, presence of shoulders, and the location of trucks, affect the behavioral pattern of solid slab bridges. Therefore, this study will investigate the effect of these factors by analyzing one-lane, two-lane, three-lane, and four-lane bridges, with or without shoulders, each having four different span lengths. Bridges were fully loaded (one AASHTO HS20 truck in each lane). Loads were either centered in every lane, or located towards one edge of the slab. In addition, all the slab bridges with shoulders were over-loaded by assuming a disabled truck on one edge of the bridge in combination with the other design trucks stationed side by side; this combination produces the worst loading conditions on the bridge. Design trucks were positioned in the longitudinal direction in order to produce the maximum positive bending moment.--The finite element method is proposed to analyze the solid slab bridges by using the structural analysis program SAP90. The research focussed on evaluating the maximum lateral bending moment distribution over the critical cross-section of the bridges. The results of this study were used to assess the design approach currently employed by the American Association of State Highway and Transportation Officials (AASHTO) " Standard Specifications for Highway Bridges (1996)."



Finite Strip Analysis of Bridges

Author : M.S. Cheung

Publisher : CRC Press

Page : 374 pages

File Size : 50,12 MB

Release : 1996-09-05

Category : Architecture

ISBN : 9780419191506

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Book Description

In-depth, comprehensive and up-to-date information on the powerful finite strip method of analysis of bridges. It is in three parts. The first introduces the method and gives the necessary background. The second explains the evolution of the method and the third part provides detailed information on the application of the method to highway bridges.