Avoiding Disproportionate Collapse

Single Abstract

343783 - Vulnerability Assessment of Concrete Filled Steel Tube Columns under Multiple Hazards: Corrosion and Vehicular Impact

Friday, April 20
11:00 AM - 12:30 PM
Location: 202CD

Concrete filled steel tubes (CFSTs) are widely used in buildings because of rapid construction, reduced labor requirements, and low material costs. The buildings constructed with CFSTs are, however, exposed to multiple hazards and stressors. Accidental or intentional vehicle collision with building columns can result in significant damage to the columns and potentially lead to partial or full collapse of the structure. On the other hand, the steel tube exposed to atmosphere will be subjected to corrosion. This will further increase the probability of failure because of deterioration mechanisms. In this study, a multi-hazard approach to investigate the CFSTs under corrosion and vehicular impact is developed. A detailed finite element (FE) analysis is conducted using the LS-DYNA package. FE models for truck is obtained from the National Crash Analysis Center and the National Transportation Research Center. The FE models of the CFSTs are first validated with the experimental test results by comparing the impact force time history and maximum deflection. To account for corrosion, the material loss for the steel tube is considered along the height of the column. The impact analysis is performed for a range of truck impact velocities and corrosion scenarios. The vulnerability of corroding CFST columns under the expected impact loads is assessed by calculating impact force time history, maximum shear and moment, and column displacement at various locations. The analysis results with and without including the corrosion effects are particularly compared. It is believed that the outcome of this study directly contributes to improve the design and configuration of this important category of structural members.

Behrouz Shafei

Iowa State University

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Dikshant Saini

Iowa State University

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343783 - Vulnerability Assessment of Concrete Filled Steel Tube Columns under Multiple Hazards: Corrosion and Vehicular Impact



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