著者

桑村 仁

出版者

日本建築学会

雑誌

建築雑誌 (ISSN:00038555)

巻号頁・発行日

no.1457, pp.18-21, 2000-07-20

参考文献数

1

被引用文献数

1

著者

桑村 仁 松本 由香 武谷 政國

出版者

日本建築学会

雑誌

日本建築学会構造系論文集 (ISSN:13404202)

巻号頁・発行日

vol.62, no.494, pp.129-136, 1997-04-30 (Released:2017-02-02)

参考文献数

21

被引用文献数

2 4

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It has been pointed out in this decade that the currently used thick cold-formed box-section columns in building frames may fail in the mode of brittle fracture instead of local buckling, and that their ductility preceding brittle fracture may not be enough to resist a severe earthquake. In order to solve this problem, hot-rolled box-columns have been recently developed, in that the forming is done at high temperature to avoid cold working. In this study, the ultimate behaviors of the box-columns having through diaphragms, which is the current practice in building steel construction, were experimentally investigated. It was found that the newly developed hot-rolled box-columns exhibit much higher ductility than the conventional cold-rolled box-columns when the ultimate state is governed by brittle fracture as well as by local buckling.

著者

桑村 仁 松本 由香 武谷 政國

出版者

日本建築学会

雑誌

日本建築学会構造系論文集 (ISSN:13404202)

巻号頁・発行日

vol.62, no.494, pp.129-136, 1997

被引用文献数

5 4

---

It has been pointed out in this decade that the currently used thick cold-formed box-section columns in building frames may fail in the mode of brittle fracture instead of local buckling, and that their ductility preceding brittle fracture may not be enough to resist a severe earthquake. In order to solve this problem, hot-rolled box-columns have been recently developed, in that the forming is done at high temperature to avoid cold working. In this study, the ultimate behaviors of the box-columns having through diaphragms, which is the current practice in building steel construction, were experimentally investigated. It was found that the newly developed hot-rolled box-columns exhibit much higher ductility than the conventional cold-rolled box-columns when the ultimate state is governed by brittle fracture as well as by local buckling.

著者

桑村 仁 礒崎 あゆみ

出版者

日本建築学会

雑誌

日本建築学会構造系論文集 (ISSN:13404202)

巻号頁・発行日

vol.67, no.556, pp.159-166, 2002-06-30 (Released:2017-02-04)

参考文献数

15

被引用文献数

15 20

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Ultimate behaviors of mechanically fastened shear type connections of thin stainless steel plates were investigated on the basis of quasi-static tensile test of 90 specimens. The specimens were formed from SUS 304 flat plates of 1.5mm and 3.0mm thickness and an SUS304 angle section of 3.0mm thickness, the connections of which were fastened by SUS 304 ordinary strength bolts of M12 and M16,and SUS 630 high-strength bolts of M12. Major observations are : four fracture modes, i.e., net section fracture, end opening fracture, block shear fracture, and fastener shear fracture were observed ; current design method has a difficulty in predicting the fracture mode which should take place among the four modes ; and current design formulae tend to overestimate the ultimate strength. From these facts, modified formulae for calculating the ultimate strength were proposed, which were found to provide a satisfactory prediction for failure mode and ultimate strength.

著者

桑村 仁

出版者

一般社団法人日本建築学会

雑誌

建築雑誌 (ISSN:00038555)

巻号頁・発行日

vol.111, no.1389, 1996-05-20

著者

桑村 仁

出版者

日本建築学会

雑誌

日本建築学会構造系論文集 (ISSN:13404202)

巻号頁・発行日

vol.59, no.461, pp.123-131, 1994

被引用文献数

8 5

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Cyclic tension and compression test was performed to clarify the transition from fatigue fracture to ductile fracture in structural steel. The fracture transition was clearly identified in the plastic strain accumulation pattern, the fractographic appearance, and the crack penetrating profile. When the elongation amplitude a is less than the transition amplitude aTr, the fatigue is predominant, so that the skeleton strain in the stress-strain hysteresis curve approaches zero, striation patterns are observed in the fractographic picture, and the crack goes straight into the thickness without any void around the crack tip. On the other hand, when a is greater than aTr, the ductile fracture is predominant, so that the skeleton strain increases with the elevated amplitude, mashed dimple patterns are observed in stead of striations, and the crack penetrates in zigzags joining coalesced voids.