Assessment of Progressive Collapse for a Multi-Storey RC Framed Structure using Linear Static Analysis Technique

摘要

The structures normally get collapsed due to the failure of one or a few structural components which then progresses over the other successive components. This process is known as progressive collapse of the structure. Progressive collapse is the process of extensive failure initiated by local structural damage, or a chain reaction of failures. Local damage that initiates progressive collapse is called initiating damage. Progressive collapse can be triggered by many different actions and the prediction of such abnormal actions is very difficult and depends on many factors Hence, there occurs the loss in loadcarrying capacity of the small portion of a structure due to abnormal or haphazard load which progresses in series of failures of other components and thus the collapse of the building take place. Therefore, a linear static analysis approach has been adopted here for determining robustness against the local failure and accidental occurrences for a RC framed structure to evaluate the demand capacity ratio and the safety of the structure. A finite element model has been developed for the 10 storey building and then the analysis is carried under critical column removal scenario as per the guidelines provided in GSA (2003) considering the provisions of IS 18932002 to simulate dynamic collapse mechanism using ETABS software v16.2.1 (software for modelling or analysis of structure) to assess the vulnerability to progressive collapse of atypical RC framed structures. Thus, the influence of critical eliminated elements has been discussed and the parameters such as Demand capacity ratio, collapse resistance and Robustness indicator has been calculated and checked against the acceptance criteria to draw the final conclusions.