A welded joint system using diaphragm plate is generally appliedto the beam-to- column connections of moment-resisting frames thatare configured with the square tube columns and wide flange beansfrequently used for steel structures. These connections arestructurally very important to assure earthquake resistance inframes, which are the mot highly fabricated parts of steel structuresand require strict qual- ity control because of many spots to bewelded. The examples of disaster in the Kobe Earthquake have evenmade it important to control the quality of spot-welds on Columnswith beams.
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