Pounding effects of movable bearing on seismic behaviors of continuous girder bridges

2010 ◽  
pp. 121-126
Keyword(s):  
Girder Bridges ◽  
Seismic Behaviors

Curved, precast, pretensioned concrete I-girder bridges

PCI Journal ◽  
2008 ◽  
Vol 53 (6) ◽  
pp. 48-66 ◽  
Author(s):  
Wilast Amorn ◽  
Christopher Y. Tuan ◽  
Maher K. Tadros
Keyword(s):  
Girder Bridges ◽  
Pretensioned Concrete

PRESTRESSED GIRDER BRIDGES

PCI Journal ◽  
1971 ◽  
Vol 16 (4) ◽  
pp. 80-98 ◽  
Author(s):  
James R. Libby
Keyword(s):  
Girder Bridges

Live-Load Girder Distribution Factors for Bridges Subjected to Wide Trucks

2000 ◽  
Vol 1696 (1) ◽  
pp. 144-149 ◽  
Author(s):  
Sami W. Tabsh ◽  
Muna Tabatabai
Keyword(s):  
Finite Element ◽  
The United States ◽  
Live Load ◽  
Wheel Load ◽  
Element Analysis ◽  
Load Effect ◽  
Design Specifications ◽  
Girder Bridges ◽  
Girder Distribution Factors ◽  
Modification Factor

An important problem facing engineers and officials in the United States is the constraint imposed on transportation due to limitations of bridges. These limitations typically constrain vehicles to minimum heights and widths, to minimum and maximum lengths, and to a maximum allowable weight. However, with current demands of society and industry, there are times when a truck must carry a load that exceeds the size and weight of the legal limit. In this situation, the trucking company requests from the state departments of transportation an overload permit. For a truck with a wheel gauge larger than 1.8 m (6 ft), the process of issuing a permit for an overload truck requires a tremendous amount of engineering efforts. This is because the wheel load girder distribution factors (GDFs) in the design specifications cannot be used to estimate the live-load effect in the girders. In some cases, an expensive and time-consuming finite element analysis may be needed to check the safety of the structure. In this study, the finite element method is used to develop a modification factor for the GDF in AASHTO’s LRFD Bridge Design Specifications to account for oversized trucks with a wheel gauge larger than 1.8 m. To develop this factor, nine bridges were considered with various numbers of girders, span lengths, girder spacings, and deck slab thicknesses. The results indicated that use of the proposed modification factor with the GDF in the design specifications can help increase the allowable load on slab-on-girder bridges.

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