Realistic Modeling of High Rise Structures subjected to Progressive Collapse

摘要

Progressive collapse of high rise structures is a complex dynamic phenomenon inrnwhich partial or total collapse of structures occurs due to damage of one or morerncritical structural members. Current codes like the General Service Administrationrn(GSA 2003) and Department of Defence (DOD) recommends prescriptive approachrnand the alternative load path method if prescriptive checks fail. However, there is nornprovision to guide designers on how to realistically model the sudden loss of criticalrnstructural members due to unforeseen event. This research work compares fourrnmethods of sudden column loss modelling in assessing the effect of modellingrntechnique on the structural response using rotational and dynamic displacementrnresponse at the nodal point. The research work is based on the provision of GSArn2003 loading criteria for dynamic analysis using a commercial finite elementrnstructural analyses program SAP 2000.