Avoiding Disproportionate Collapse
Full Session with Abstracts
335314-4 - Experimental Study on Robustness of Steel Moment-Resisting Frame
Friday, April 20
1:30 PM - 3:00 PM
This paper investigates the collapse resistance of steel moment-resisting frame structures. A series of static push-down analysis are conducted experimentally using 1/3 scale one-story steel frame substructures. A bare steel frame substructure without slab system is firstly tested to study its behavior subjected to loss of the interior column, following by a second experimental test on an identical frame with reinforced-concrete slab system under the same column loss scenario. The development of collapse resistance mechanisms, including flexural action of steel beams, composite action between steel beams and the floor system, and the catenary action of the beams and slabs is analyzed experimentally. Moreover, by comparing the results of these two experimental tests, the effects of the slab system on the robustness of steel moment resisting frame are also explored. On the basis of the test results, a retrofit method to prevent progressive collapse is proposed and proved to be efficient and economical experimentally.