The figure below shows the failure at the collector beam flange of a welded brace to collector beam in an eccentrically braced frame in the February 22, 2011 Christchurch earthquake. Choose all the statements about this failure which are correct多项选择题
A
The failure shows that the collector beam material was brittle at the time of the earthquake
B
This failure occurred when the brace was in tension due to earthquake loading
C
If the brace flange below the beam flange had lined up with the stiffener above the beam flange and the welds had been sufficiently strong, this failure would not have occurred
D
Because the brace flange was wider than the collector beam flange, this failure would have occurred even if the brace flange below had lined up with the stiffener above
E
The failure was a ductile tearing failure in the beam web due to overloading
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