STUDY THE EFFECTIVENESS OF OUTRIGGER STRUCTURAL SYSTEM DURING PROGRESSIVE COLLAPSE OF HIGH RISE CONCRETE BUILDING

Pragnesh C. Patel, Digesh D. Joshi, Paresh V. Patel

Abstract: One of the major causes for failures of many high profile structures took place, around the world, is extreme loading effects generated due to hurricane, flood, earthquake, explosion and terrorist attacks on buildings. This type of event imposes abnormal loading on the building structure. Generally, members of building are not designed to resist this type of abnormal loading and results into failure. One of the mechanisms of failure during such event is referred to as “Progressive Collapse”. In the current study, progressive collapse potential of 50-storey RC building with outrigger structural system is evaluated. Outriggers are basically rigid horizontal structural members connected between external columns and central core. Effectiveness of different locations of outriggers throughout the height of building on progressive collapse resistance is studied under two different column removal scenarios. Non-linear static analysis is performed for removal of corner column and side face column, separately, from bottom storey, by following U. S. General Service Administration (GSA) guidelines. Modelling, analysis and design of building is carried out using MIDAS Gen software. From the analysis results, it is observed that building with outriggers provided at mid height location and at top exhibits superior progressive collapse resistance

Keywords: Progressive Collapse, Outrigger Structural System, Non-linear Static Analysis, High Rise Building, Column Removal Scenario

DOI: https://doi.org/10.15623/ijret.2016.0532025