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TitleLive Load Test and Finite Element Analysis of a Box Girder Bridge for the Long Term Bridge
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                            Live Load Test and Finite Element Analysis of a Box Girder Bridge for the Long Term Bridge Performance Program
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Utah State University Utah State University

[email protected] [email protected]

All Graduate Theses and Dissertations Graduate Studies

5-2011

Live Load Test and Finite Element Analysis of a Box Girder Bridge Live Load Test and Finite Element Analysis of a Box Girder Bridge

for the Long Term Bridge Performance Program for the Long Term Bridge Performance Program

Dereck J. Hodson
Utah State University

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Recommended Citation Recommended Citation
Hodson, Dereck J., "Live Load Test and Finite Element Analysis of a Box Girder Bridge for the Long Term
Bridge Performance Program" (2011). All Graduate Theses and Dissertations. 835.
https://digitalcommons.usu.edu/etd/835

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LIVE LOAD TEST AND FINITE ELEMENT MODEL ANALYSIS OF A BOX GIRDER


BRIDGE FOR THE LONG TERM BRIDGE PERFORMANCE PROGRAM



by



Dereck J. Hodson



A thesis submitted in partial fulfillment
of the requirements for the degree


of


MASTER OF SCIENCE


in


Civil and Environmental Engineering








Approved:


____________________ _____________________
Paul J. Barr Marvin W. Halling
Major Professor Committee Member



____________________ _____________________
Joseph A. Caliendo Byron R. Burnham
Committee Member Dean of Graduate Studies






UTAH STATE UNIVERSITY
Logan, Utah


2010

Page 55

43

For the most part, the aspect ratio was kept below 4. Special cases, because of the

complex geometry conditions, warranted that the ratio exceed 4 but was still kept below

10. In the cases where the ratio exceeded 4, the ratio was usually only 5 or 6. It was also

important that the angles in the solid elements be kept at 90° whenever possible. If this

was not possible, it was important that the angles be in the range of 45° to 135°. These

guidelines were used because it improved the accuracy of the finite element model by not

allowing the elements to become too distorted (Computers and Structures, 2009). Most

of the elements in the finite element model were rectangular; however, in the instances

where the elements were not rectangular the angles were kept between the 45° to 135°

range. To keep the mesh fine, the longitudinal nodes were typically 0.3m (1 ft) on center.

Longitudinal increments at diaphragms were sometimes larger, up to 0.76 m (2.5 ft),

because of the skewed geometry. In the transverse direction, the nodal locations were

typically 38.1 cm (15 in.) or less on center. In the vertical direction, the dimensions of

the elements ranged from 15.2 cm to 45.7 cm (6 in. to 18 in.). By using small elements

the finite element model was refined and any large to small element transitions were

avoided to increase the accuracy of the finite element model. Figure 27 shows a cross

sectional view of the finite element model of the Lambert Road Bridge.



Figure 27 Cross-sectional view of FEM showing the solid elements.

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