A Study on Damage Concentration in Low-Rise Steel Moment Frames under Severe Seismic Motions

Abstract eng:
A steel moment frame is categorized as the most ductile structure, therefore, basically has an excellent earthquake (EQ) resistant capacity. However, in 1995 Kobe EQ, premature collapses such as the first-story local sway collapse mechanism, or brittle fractures in the welding joints were widely observed in low-to-middle rise steel moment frames due to damage concentration. The damage (plastic strain energy) concentration to a specific story or the inter-story damage distribution phenomena are studied through dynamic elasto-plastic response analyses using trial modeling of low-rise (3 stories) steel moment frames. The results are summarized and discussed in terms of the story-drift responses, the cumulative rotation capacities of plastic hinges, or the plastic-energy absorbed quantities and its concentration patterns. KEYWORD: Column and beam strength ratio, Type of column-base, Cumulative plastic deformation ratioη

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