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This one test only established the potential of typical steel structures to resist progressive collapse in the event of sudden removal of a column.
1. The ultimate capacity of the structure following a loss of column is limited by the beam-to-column connections at the lost column. The catenary action of the beams and steel deck appear to be adequate to prevent progressive collapse provided that connection bolts do not prematurely fail.
2. The steel deck is effective in redistributing the increased load resulting from the loss of a column. Maximum stress readings during the tests were mostly between 5 and 15 ksi, however, localized small areas of deck yielded. Failure of the steel deck through ripping or tearing was isolated and did not limit the strength of the system.
3. The combined Catenary action of floor steel deck and the simply-supported girders was able to prevent collapse of column with a load of about 63 kips in the column. This load corresponds to about 300 kips per square feet of tributary area of the floor. Considering a reduction factor of 0.5 due to impact, the floor load that was carried by Catenary action could be established as about 150 pound per square feet of tributary area.
4. This one test only established the potential of typical steel structures to resist progressive collapse in the event of sudden removal of a column. Further research is needed to establish the parameters that affect this resistance and to develop appropriate design guidelines to take advantage of this phenomenon in preventing collapse of structures.
Originally posted by billybob
here's something similiar that's new.
buildings fall down
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