This paper presents seismic response of steel structures including fractures at tubular braces. We apply pseudo dynamic test of substructure to collaborative structural analysis system in order to conduct high-accuracy analyses because it is very difficult to predict fracture life of steel members accurately. Analyses of three-story steel moment frame with loading tests of tubular braces are conducted using various earthquake intensities. The results show tubular braces are hard to fracture under severe earthquake even if the braces have low deformation capacity, and affects of the brace fracture after local buckling is limited because the strength is considerably degraded.
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