Load distribution factors for horizontallycurved composite concrete-steel girder bridges

Dissertant

Ali, Ibtihal Fadil

Thesis advisor

Sayhud, Iyad Kazim
Muhammad, Nisrin S.

University

University of Technology

Faculty

-

Department

Department of Building and Construction Engineering

University Country

Iraq

Degree

Master

Degree Date

2012

English Abstract

Curved steel I-girder bridges have become an important component in highway systems.

A simplified analysis method is needed for analyzing both existing and new bridges.

If appropriate simplified formulas for load distribution factors exist, there is no need for complex analysis.

In this study, a 3-D finite element model was used for the analysis of curved slab on girder bridges.

Aparametric study was carried out to calculate the load distribution factors for curved steel I-girder bridges based on (AASHTO LRFD) live loads using F.E.M by SAP 2000 (Structural Analysis Program).

Load and Resistance Factor Design (LRFD) is a design methodology that makes use of load and resistance factors based on the known variability of applied loads and material properties.

The parameters considered in this study were: span-to-radius of curvature ratio, span length, number of longitudinal girders, girder spacing and the analysis of bridge that will be performed for the case of full live load and partial live loads.

The results using developed empirical equations if compared with AASHTO LRFD, are (2.05, 1.87 and 1.69) as a moment distribution factor; these values are closed and reasonable to AASHTO LRFD.

The full data are given together with AASHTO LRFD calculations up to L/R equal to (0.3).

A computer program using Visual Basic is built to compute the moment distribution factor (MDF) and deflection distribution factor (DDF) for a straight girder using AASHTO LRFD equations and limitations for geometry girder in present study.

The results from present study shows the moment distribution factor and deflection distribution factor for curved bridge if compared to the straight bridge (L/R=0), is decrease as the curvature ratio increase in most cases.

For (L/R=0.2, 0.3) the range in decrease between (0-80%) while the range of increase between (0-214%)for MDF and the range in decrease between (0-77%) and the range of increase between (0-500%) for DDF.

Main Subjects

Engineering & Technology Sciences (Multidisciplinary)

Topics

• Concrete
• Mechanical properties

• APA
• MLA
• AMA

Language

English

Data Type

Arab Theses

Record ID

BIM-419830