Nippon Steel Sumitomo Metal Corporation

Nippon Steel & Sumikin Metal Products Co., Ltd.

Tadayoshi Okada

Yoshiyuki Watanabe

Kazuo Inoue

Yasushi Hasegawa

Suguru Yoshida

Masaki Mizoguchi

Yugo Sato

Nobuyoshi Uno

Hiroyuki Shinmura

A column and beam connection structure for connecting a steel H-beam to a column uses an external diaphragm. The external diaphragm includes a plurality of divided diaphragm segments such that each diaphragm segment has a column plate abutting on the column. A diaphragm segment which is arranged along the steel H-beam among the plurality of divided diaphragm segments has a beam plate installed in a flange of the steel H-beam. The beam plate has an end portion in which the column plate is provided. A joining surface between the diaphragm segments is placed in a vicinity of a corner portion of the column so that only the column plate of one of the diaphragm segments abuts on each column surface of the column. A joining member fastens to fix between the diaphragm segments such that contact pressure is applied from the column plates to the surface of the column.

Column and beam connection structure and method

The present invention provides high temperature strength and fire-resistant steel superior in weld joint reheat embrittlement resistance and toughness which is produced using steel of a room temperature strength of the 400 to 600N/mmclass containing as main ingredients C: 0.010% to less than 0.05%, Si: 0.01 to 0.50%, Mn: 0.80 to 2.00%, Cr: 0.50% to less than 2.00%, V: 0.03 to 0.30%, Nb: 0.01 to 0.10%, N: 0.001 to 0.010%, and Al: 0.005 to 0.10%, limiting the contents of Ni, Cu, Mo, and B, and satisfying the relationship of 4Cr[%]-5Mo[%]-10Ni[%]-2Cu[%]-Mn[%]&#x3e;0.

Fire-resistant steel superior in weld joint reheat embrittlement resistance and toughness and method of production of same

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Tokyo, Japan

Tadayoshi Okada