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Prevention of progressive collapse for building structures to member disappearance by accidental actions
Authors:Jae-hyouk Choi  Dong-kuk Chang
Institution:1. Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education (Harbin Institute of Technology), Harbin 150090, China;2. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China;3. Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China
Abstract:Recently some building structures have collapsed because of losses of vertical load carrying capacities resulting from accidental events. In this paper, limit analysis called Compact Procedure is applied to some cases of collapsed structures and the key-elements in the structures are identified using Sensitivity Analysis. Two collapse prevention methods are discussed. For truss structures, the collapse can be prevented by reinforcement of members having sensitivity greater than 0.3–0.4. For frame structures, the relations between the sensitivity and the progressive collapse are defined using a safety factor and the progressive collapse can be prevented by fixing X braces into each span of the top floor.
Keywords:
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