Collapse Experiment on 4-Story Steel Moment Frame: Part 2 Detail of Collapse Behavior

Abstract eng:
A shaking table test on a full-scale steel building was conducted at the E-Defense three-dimensional shake table facility to evaluate structural and functional performance of the building under design-level ground motions and the safety margin against collapse under exceedingly large ground motions. The specimen is a 4-story moment resisting frame designed and constructed according to the current design specifications and practice and it is attached with non-structural components. This paper is an extension of a companion paper that describes objectives, design of the specimen, protocols of the excitation and the outline of the results. This paper presents further detailed results concerning the nonlinear response of the specimen building subjected to JR Takatori records of 1995 Hyogoken-Nanbu earthquake. By 40% and 60% scaled Takatori records, which corresponds to the level 2 and larger seismic load, maximum inter-story drift exceeds 0.01 radian and some structural members experienced yielding and the mechanism of the moment frame was overall sway mechanism. By 100% Takatori records, the mechanism of the specimen changed to a weak story type mechanism in the first story by strength deterioration of columns due to local bucklings at the top and bottom ends and collapsed. The detailed behavior of the deteriorated structural members and the safety margin of steel moment frames designed in current seismic code against complete collapse are discussed.

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