Cross-frame stiffness modification factors for composite steel I-girder bridges
| dc.contributor.advisor | Helwig, Todd Aaron, 1965- | |
| dc.contributor.committeeMember | Engelhardt, Michael D | |
| dc.contributor.committeeMember | Clayton, Patricia | |
| dc.contributor.committeeMember | Taleff, Eric | |
| dc.creator | Park, Sunghyun | |
| dc.creator.orcid | 0000-0001-6857-1617 | |
| dc.date.accessioned | 2021-10-18T20:32:18Z | |
| dc.date.available | 2021-10-18T20:32:18Z | |
| dc.date.created | 2021-08 | |
| dc.date.issued | 2021-07-30 | |
| dc.date.submitted | August 2021 | |
| dc.date.updated | 2021-10-18T20:32:19Z | |
| dc.description.abstract | When analyzing steel I-girder bridges, the approach used to model cross-frames can significantly impact performance predictions for girder stability during construction and for cross-frame fatigue under in-service traffic loading. A common practice is to model cross-frame members as truss members subject to axial forces only. Recent research has shown that this approach can lead to erroneous predictions of cross-frame stiffness and cross-frame member forces. Actual cross-frames are typically constructed using single-angle members with gusset plate connections that introduce significant out-of-plane eccentricity and in-plane rotational restraint. These connection effects combined with the complex bending behavior of single-angles results in significant bending of the cross-frame members. This bending behavior can significantly change the axial stiffness of the cross-frame member and potentially introduce large errors in truss element models. The objective of this research is to study the behavior of cross-frames in steel I-girder bridges to better understand their stiffness and internal force distributions during in-service traffic loading on the completed bridge as well as during construction of the bridge. The research involves development of high-fidelity three-dimensional finite element models of steel I-girder bridge systems, with predicted cross-frame response validated using laboratory experimental data as well as data from field instrumentation of in-service bridges. The validated models are then used to conduct parametric finite element studies to examine a wide range of bridge and cross-frame geometries. Based on the results from the parametric studies, stiffness modification factor for truss element models is developed to improve the analysis of cross-frames in steel I-girder bridges. | |
| dc.description.department | Civil, Architectural, and Environmental Engineering | |
| dc.format.mimetype | application/pdf | |
| dc.identifier.uri | https://hdl.handle.net/2152/89235 | |
| dc.language.iso | en | |
| dc.subject | Cross-frame | |
| dc.subject | Stiffness | |
| dc.subject | Bridge | |
| dc.subject | Stiffness modification factor | |
| dc.title | Cross-frame stiffness modification factors for composite steel I-girder bridges | |
| dc.type | Thesis | |
| dc.type.material | text | |
| thesis.degree.department | Civil, Architectural, and Environmental Engineering | |
| thesis.degree.discipline | Civil Engineering | |
| thesis.degree.grantor | The University of Texas at Austin | |
| thesis.degree.level | Doctoral | |
| thesis.degree.name | Doctor of Philosophy |
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