Software Developed at FSEL

UT Lift 1.3

PURPOSE: The purpose of this spreadsheet is to provide a tool and give information to an engineer when deciding the safety of lifting a horizontally curved steel I-girder with one crane and two lift clamps. The difference between versions 1.2 and 1.3 are primarily editorial changes.

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UT Bridge 1.5-1

PURPOSE: UT Bridge is a PC based user-friendly 3-D finite element analysis program that analyzes straight or curved I-girder bridges during girder erection and concrete deck placement. The program uses information readily available to the practicing engineer and develops a robust model to predict the behavior of these bridges providing the user with displacements, stresses, and rotations.

The software installation has been tested on Windows 7, Windows XP, and Windows Vista.

Training modules are included in the downloaded files and appear in the program's folder once it has been installed.

***UT Bridge Version 1.5-1***

A modeling issue has been found with the intermediate stiffeners and cross frame connection plates in UT Bridge Version 1.5. The current model of the stiffening plate overestimates the warping restraint provided by the stiffeners and can lead to incorrect estimates of the global buckling capacity of the girders. The stiffeners and connection plates in Version 1.5-1 are set to relatively small values regardless of the size that is input. This model will provide good estimates of the global buckling capacity of the girder. For relatively thin webs, the model may underestimate the shear buckling capacity of the web - however in most situations this will not be an issue for the bridges during construction. The developers are working on a permanent fix to the problem and a new version of the software will be released at that time.

A list of updates to UT Bridge

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BASP 1.4.0

PURPOSE: The program determines the elastic out-of-plane buckling load for plates having stiffeners placed symmetrically about the plate. Loading should be applied in the plane of the plates. In the lateral torsional buckling analysis of beams, the web is idealized by the plate elements (two-dimensional finite elements) while flanges are treated as stiffener elements (one-dimensional finite elements). Arbitrary planar geometry, loading, and in-plane and out-of-plane boundary conditions may be accurately represented. The in-plane boundary conditions include support movements and springs. And, the out-of-plane conditions include the lateral deflection, the rotation about either x-axis or y-axis, which can be free to deflect and rotate or be fixed. In addition, lateral and torsional springs can be placed to represent brace stiffness or warping restraint.

The program consists of two types of analysis; the first one is the in-plane stress analysis, which calculates the stresses under the applied loading and in-plane boundary conditions. The second one is the out-of-plane buckling analysis, which determines the eigenvalue under the stresses calculated and out-of-plane boundary conditions. In the analysis, cross section distortion as well as local buckling of the web and torsional buckling of the flanges are accounted. The buckling load is the eigenvalue times the input load.

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UTrAp 2.0

PURPOSE: UTrAp 2.0 is intended to perform both linear analyses and linearized buckling analyses of straight or curved steel trapezoidal box-girder bridges under construction loading. The program is able to model the partially-composite behavior due to concrete curing during the bridge deck pours. UTrAp 2.0 is limited to elastic analyses, and does not account for nonlinear material behavior. There are no limits on stresses in the girder, which may therefore exceed the yield stress. In order for the UTrAp analysis to be valid care must be taken by the designer to ensure that the bridge remains elastic under the given loading.

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Questions or Comments about software.