Kajima Corporation

Hitachi Metals, Ltd.

Hitachi Kizai, Inc.

Toshikazu Yamada

Koji Ishii

Kuniaki Sato

Jun Tagami

Naoki Tanaka

Mitsuo Sakamoto

Takuji Kobori

Katsuyasu Sasaki

Hideshige Matsuo

Akio Tomita

Yoshihiro Nakamura

Masao Iizuka

Michio Itoh

Yoshikazu Maeda

Yoshiki Ikeda

Shinichi Takahashi

Isao Nishimura

Mikio Kobayashi

Yukihiro Omika

Shozo Maeda

Haruhiko Kurino

Toshiyuki Fukumoto

Toshio Saeki

Yoshikatsu Miura

Isamu Yamamoto

Eiji Fukuzawa

Isamu Yamamato

Toshiyuki Fukimoto

Yuji Kotake

Mitsunobu Iwata

Shii Sen

Kouichi Suguki

Akihiko Amana

Osamu Narishige

Koji Ishit

Shue Suzuki

An oil pressure damper device for an architectural structure and a monitor and control system of the damper device without requiring an exclusive network for connecting between the damper devices and the monitor and control system, and is able to monitor operations without regard to the distance between the damper devices and the monitor system. The oil pressure damper device includes a detection unit for detecting conditions of the damper device, a communication unit for transmitting information detected by the detection unit through a public communication network and/or a local area network, and a monitor for receiving the information from the communication unit and monitoring the conditions of the damper devices of the architectural structure.

Damper device for building, and monitor and control system for damper device

A safety monitoring device is provided for the use in an active seismic response and wind control system for exerting a control force, which restrains the vibration of a structure due to disturbances such as earthquake and wind, from an actuator in response to the above vibration. The safety monitoring device measures the work done of a seismic response control force and judges the work done of the seismic response control force to be positive or negative, so that whether or not the seismic response control is properly carried out by the actuator is judged. If any abnormality is found, a stop signal or the like is generated to stop the seismic response and wind control system, whereby the safety of the structure is ensured.

Safety monitoring method for use in active seismic response and wind

An elasto-plastic damper to protect a building from destructive impact of seismic tremors and/or high winds. The damper is a cylindrical shaft with a constricted waist portion adapted to yield uniformly throughout its length to an external force from any direction in a plane perpendicular to the longitudinal axis of the waist portion. This elasto-plastic deformation of the damper dissipates the energy of seismic and/or wind impact throughout its range of elastic deformation. The ends of the damper are threaded to facilitate threaded fastener engagement with structural and non-structural members of building.

Elasto-plastic damper for structure

A vibration absorbing device to be secured between structural and non-structural members of a framed structure. An outer ring may be secured to a structural member and an inner ring is concentrically positioned within said outer ring and may be secured to a non-structural member. Radial spokes interconnecting the inner and outer rings are adapted to elasto-plastically deform when one ring is arcuately shifted relative to the other ring responsive to vibration of the inner and/or outer ring, thereby absorbing the energy of vibration.

Vibration absorbing device for structure

A column base structure having connected a pair of column-base metal fittings to the lower part of a column consisting of a pair of main column members disposed at predetermined intervals and connecting members disposed in such a manner as to integrally connect the main column members; the column base metal fittings being fixedly fitted to a concrete foundation via anchor bolts and nuts; characterized in that a horizontal member having a predetermined cross-sectional area is integrally and fixedly fitted between the main column members in the vicinity of the column base metal fitting.

Column base structure

Safety monitoring device for use in active seismic response and wind

A positive vibration suppression apparatus is disclosed, which suppresses vibrations of a building caused by earthquakes or winds by applying a control force to the building. The apparatus comprises a weight provided on the top of the building in a suspended form to reduce friction and an actuator provided between the weight and the building. The vibration suppression apparatus is controlled through sensing of the vibrations of the building and weight by a sensor, whereas for excessive vibrations of the building the vibrations of the weight are made close to the vibrations of the building to protect the apparatus, because the capacity of the vibration suppression apparatus is limited. Further, in an oil hydraulic system for obtaining a great control force, small and large size oil hydraulic pumps connected to respective small and large size electric motors and an accumulator are provided in parallel, so that the apparatus is warmed up at all time for oil hydraulic control with low power consumption. Two or more vibration suppression apparatuses are controlled at the same time according to the shape of the building to cope with torsional and secondary vibration components.

Apparatus for accelerating response time of active mass damper

An elasto-plastic damper is disclosed which comprises either a metal block-like or a metal plate-like damper body, each having a plurality of spaced apart openings extending therethrough to provide elastic deformability to the damper body. The elasto-plastic damper is adapted to connect bifurcated axially aligned structural members in a building. When an earthquake tremor impacts upon the building, the vibrational energy transmitted to the bifurcated axially aligned structural members is attenuated by the interconnecting elasto-plastic dampers.

Elasto-plastic damper for use in structure

A column/beam joint structure, made of steel members, in which a reinforcing member formed into a flat plate or into a strip shape so as to surround the outer periphery of the flange is interposed between a flange having a vertical plane constituting the column and a base plate constituting a connector fixedly fitted to an end of a beam. The flange, the reinforcing member and the connector are integrally joined together via a connecting fastener member.

Column/beam joint structure

Growing community of inventors

Tokyo, Japan

Toshikazu Yamada