Sumitomo Metal Industries, Inc.

Shimizu Construction Co., Ltd.

Fumio Ohtake

Chihiro Hayashi

Hideo Shimizu

Kiyoshi Ikura

Masahiro Kato

Yoshitaka Yabe

Yasuhiro Asai

Toshihiko Hirama

Toshio Uno

Shinji Mase

Masami Hamada

Tomomi Kanemitsu

Takeshi Kikuchi

Takehiko Terada

Kiyokazu Tanaka

The present invention provides an earthquake resistant multi-story building which is characterized by having an energy concentration story. The energy concentration story has an elasto-plastic force-displacement relationship regarding horizontal force and displacement. The force-displacement relationship is characterized in that: (a) stiffness in elastic range (F.sub.y /d.sub.y) is generally equal to an optimal stiffness of the same story according to an elastic design concept; (b) the yield strength F.sub.y is generally less than 80% of an optimum yield strength; (c) stiffness in plastic range is positive and generally less than about a half of the stiffness in the elastic range; and (d) ultimate displacement is generally at least twice as large as the yield displacement. The energy concentration story is capable of entering into the plastic range while other stories are in the elastic range, and absorbing vibration energy by plastic deformations thereof so as to decrease deformations of other stories when a large external force is exerted to the building.

Earthquake resistant multi-story building

An I-beam is made lighter in weight by corrugating the central portion of its web. Dimension of the corrugating is determined by predetermined experimental equations. The corrugating work is performed by a pair of complementary intermeshing rolls having the same dimensions.

Method for producing I-beam having centrally corrugated web

Growing community of inventors

Kashima, Japan

Fumio Ohtake