Document Type

Article

Publication Date

2022

Abstract

In our recent catastrophes, Progressive collapse become an essential behavior that should be researched widely and to be considered by engineers through the design process. The main vertical loss can be caused by different reasons, either blast due to terrorist attack, failure of columns due to extreme earthquake application, or finally, losing a structural element due to high impact resulted from a vehicle or any other moving object. Losing main vertical element due to extreme earthquake excitation is an important and repeated occurrence, However, it didn’t take much attention in progressive collapse recent studies. Unified Facilities Criteria (UFC) and General Services Administration (GSA) guidelines are used for structural assessment by observing the behavior of structures suffered from progressive collapse due to losing main vertical support, the structure’s types are categorized according to the construction material used such as steel, concrete, or timber. Unfortunately, there is no specific guidelines for different structure systems used and subjected to earthquake excitation at the same time. As a result, it is vital to understand the structure behavior including the change in structure system parameter with respect to earthquake excitation. In this paper, an observation on the behavior of a post-tensioned slab system due to the failure of main structure element during earthquake excitation is adopted. A numerical analysis is carried on an assumed prototype structure with a typical ten story reinforced concrete post-tensioned flat slab system (designed according to the (ACI 318- 14) subjected to primary vertical element removal (corner column, edge column and internal column) due to seismic activity. The case study is assessed following the guidelines of the UFC. Extreme Loading for Structures (ELS) software, based on the Applied Element Method, is used for non-linear dynamic analysis of the structure. A time history analysis of the earthquake is applied along with the column removal scenarios. Observations are recorded for the failed and un-failed cases. Column rotations and stress contours are demonstrated for different scenarios and compared to the UFC guidelines. Tendon prestressing losses are calculated with other parameters to assess the post-tensioned flat slab behavior due to column loss.

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