Evaluation of Missing Member Analyses for Progressive Collapse Design of Steel Buildings and Girder Bridges
| Author(s) | Brown, Houston A. | |
| Date Accessioned | 2010-06-08T00:26:43Z | |
| Date Available | 2010-06-08T00:26:43Z | |
| Publication Date | 2010 | |
| Abstract | The most common analysis method prescribed in progressive collapse specifications is the alternate load path analysis, which is a means for ensuring adequate structural integrity and load redistribution capability in a building. This approach is generally viewed as “threat-independent” in that it assumes the removal of individual columns (and is therefore termed a “missing column analysis” in this work), but does not consider the initiating event leading to the failure of these members. However, for reasons described herein, it is of interest to determine the blast loading that corresponds to column failure, which is an underlying threat implicitly assumed by these provisions. This is carried out through dynamic finite element modeling using the commercial software LS-Dyna. The modeling methods are validated using experimental results available in archival literature and sensitivity studies are performed to assess meshing requirements. As a result, the charge size and stand-off distance producing failure of an individual member is determined. The alternate load path analysis has been shown to be a relatively simple, yet effective method for progressive collapse mitigation in buildings, as they are made up of many members in a three-dimensional frame, resulting in redundant structures with high capacities for load redistribution. To investigate if a similar analysis method may be used for girder bridges, which are also susceptible to progressive collapse, theirload redistribution capabilities are of interest. This is explored by removing the load carrying capacity of a single girder, redistributing this load, and evaluating whether adjacent girders have enough strength to withstand the new service loading. By analyzing the results of these analyses, insight into the potential use of this method as a means of evaluating girder bridge redundancy and collapse resistance can be obtained. | en |
| Advisor | Righman McConnell, Jennifer | |
| Degree | M.S. | |
| Department | University of Delaware, Department of Civil and Environmental Engineering | |
| URL | http://udspace.udel.edu/handle/19716/5178 | |
| Publisher | University of Delaware | en |
| dc.subject.lcsh | Bridge failures | |
| dc.subject.lcsh | Building failures | |
| dc.subject.lcsh | Bridges -- Design and construction | |
| dc.subject.lcsh | Buildings | |
| dc.subject.lcsh | Structural design | |
| Title | Evaluation of Missing Member Analyses for Progressive Collapse Design of Steel Buildings and Girder Bridges | en |
| Type | Thesis | en |