Scholarly record
LOCAL AND GLOBAL EFFECTS IN STEEL BUILDINGS FRAMES DUE TO BLAST LOAD
Abstract
Explosions caused by accidents or deliberate actions can seriously damage the structural/non-structural elements of a building and endanger the life of occupants. If the explosion occurs at a short distance, structural elements in close proximity may be seriously damaged or even completely removed. Under certain conditions, these local damages spread into the structure and can generate generalized collapse (also called progressive collapse). Progressive collapse, which in many cases causes more victims than the over-pressure or flying debris, can be mitigated by various measures such as reducing exposure, increasing safety distance or reducing the vulnerability of buildings. The ability of a structure to resist such extreme actions depends on both the capacity of the most affected elements to absorb/dissipate the induced energy and on the development of alternative load transfer routes from the affected area in case of local failure. Given the low probability of occurrence, such events are not considered directly in current design but only in certain special situations (e.g. high level of protection or explosion resistant buildings). The paper presents recent results from research programs aimed at experimentally validating the response of steel frame building structures under the effect of near-field explosions. The model studied is a steel frame structure with two spans, two bays and two stories, which is tested at various explosive loads to assess the direct and indirect consequences of explosions. The resulting experimental data were used to calibrate a numerical model and to perform numerical simulations that enabled the assessment of the local resistance of the columns to direct action of the explosion and the potential for progressive collapse in case of loss of a column.
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References11
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Number of times cited according to Crossref: 1
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