Test apparatus for static simulation of earthquake response and verification of seismic design formulas

Research Project

Project/Area Number	61460161
Research Category	Grant-in-Aid for General Scientific Research (B)
Allocation Type	Single-year Grants
Research Field	コンクリート工学・土木材料・施工
Research Institution	Tokyo Toritsu-daigaku
Principal Investigator	YAMAZAKI Jun Tokyo Toritsu-daigaku, 工学部, 助教授 (80111475)
Project Period (FY)	1986 – 1987
Project Status	Completed (Fiscal Year 1987)
Budget Amount *help	¥5,200,000 (Direct Cost: ¥5,200,000) Fiscal Year 1987: ¥2,400,000 (Direct Cost: ¥2,400,000) Fiscal Year 1986: ¥2,800,000 (Direct Cost: ¥2,800,000)
Keywords	earthquake / simulated seismic response / 鉄筋コンクリート構造 / 地震応答 / 準動的載荷試験 / 非線形
Research Abstract	A test apparatus was designed and assembled to simulate response of structures to an arbitrary seismic ground motion at loading rates much slower than actual seismic response velocity. The apparatus incorporates gears and threads to generate, magnify, and transmit force to a test specimen. Driving force is given by a conventional electric motor with brake. Rotational velocity of the motor is adiusted by a frequency inverter to which signals are sent from a conventional personal computer. The computer also retrieve data from displacement and load sensors through a digital strain meter. A typical time required to conduct a simulated seizmic response test for a selected earthquake ground motion was about one hour when the maximum restoration force was 1.0 ton, the maximum displacement was 6 mm, and the 10 seconds duration of earthquake was devided into 200 time interval steps. That required time corresponds to 18 seconds per one time step. The overall performance of the test apparatus was satisfactory. The threads ensures displacement control loading. Some slackness in the mechanical load tranmission paths requires corrections in determining displacements. Seismic simulation load tests are underway and will be continmed.