Comparative Study on the Effect of Number of Girders on Live Load Distribution in Integral Abutment and Simply Supported Bridge Girders

2013 ◽  
Vol 16 (6) ◽  
pp. 1011-1034 ◽  
Author(s):  
O. Fatih Yalcin ◽  
Murat Dicleli
Keyword(s):  
Comparative Study ◽  
Load Distribution ◽  
Bridge Girders ◽  
Live Load ◽  
Integral Abutment ◽  
Simply Supported ◽  
Live Load Distribution

scholarly journals Live-Load Testing Application Using a Wireless Sensor System and Finite-Element Model Analysis of an Integral Abutment Concrete Girder Bridge

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Robert W. Fausett ◽  
Paul J. Barr ◽  
Marvin W. Halling
Keyword(s):  
Load Distribution ◽  
Element Model ◽  
Live Load ◽  
Load Testing ◽  
Integral Abutment ◽  
Simply Supported ◽  
Live Load Testing ◽  
Girder Bridge ◽  
Live Load Distribution ◽  
Aashto Lrfd

As part of an investigation on the performance of integral abutment bridges, a single-span, integral abutment, prestressed concrete girder bridge near Perry, Utah was instrumented for live-load testing. The live-load test included driving trucks at 2.24 m/s (5 mph) along predetermined load paths and measuring the corresponding strain and deflection. The measured data was used to validate a finite-element model (FEM) of the bridge. The model showed that the integral abutments were behaving as 94% of a fixed-fixed support. Live-load distribution factors were obtained using this validated model and compared to those calculated in accordance to recommended procedures provided in the AASHTO LRFD Bridge Design Specifications (2010). The results indicated that if the bridge was considered simply supported, the AASHTO LRFD Specification distribution factors were conservative (in comparison to the FEM results). These conservative distribution factors, along with the initial simply supported design assumption resulted in a very conservative bridge design. In addition, a parametric study was conducted by modifying various bridge properties of the validated bridge model, one at a time, in order to investigate the influence that individual changes in span length, deck thickness, edge distance, skew, and fixity had on live-load distribution. The results showed that the bridge properties with the largest influence on bridge live-load distribution were fixity, skew, and changes in edge distance.

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