Progressive collapse under abnormal load

[david-smith]

Progressive collapse under abnormal load

Author: Chao Zhang (Author) | Size: 1 MB | Format: PDF | Quality: Unspecified | Publisher: ProQuest, UMI Dissertation Publishing | Year: 2011 | pages: 116 | ISBN: 1243421924-978-1243421920

A progressive collapse is initiated as a result of local structural damage and develops into a failure that is disproportionate to the initiating local damage. Structural collapse can be initiated by many hazards such as earthquakes, fires, or terrorist attacks. On 9/11, the World Trade Center (WTC) towers failed because the terrorist attack led to progressive collapse. Earthquake is a low probability/high consequence event. Therefore, it is very important to analyze how a progressive collapse caused by a seismic hazard event can unfold. In this study, the progressive collapse of a 4-story steel frame structure is analyzed under earthquake. Using equivalent base shear and alternative path methods, the conditional failure probability of a specified member and the probability of progressive collapse are both determined. Combining those results with the hazard curve of the seismic event, the progressive collapse probability of the entire structure due to earthquake can be determined. The risk assessment concept is used to evaluate the risk of a steel structure under earthquake. Based on risk analysis, the optimum size of members is obtained by using optimization under uncertainty. In this study, the procedure of estimating the probability of progressive collapse of a structure under earthquake is established. Risk estimation helps structural designer to identify critical members which have a substantial effect on structural reliability. The results of the optimal seismic design show that the expected total cost is mostly affected by the dimensions of critical members and the location of the structure.

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