THE SHAKING TABLES PROJECT

Transcription

1 PROJECT OF CRdC AMRA

2 THE FIRST ONE IN 1906 AT UNIVERSITY OF STANFORD, PROFESSOR W. ROGERS DEVELOPMENT THE FIRST INSTRUMENT TO EXPERIMENTALLY INVESTIGATE SOIL EFFECTS DURING EARTHQUAKES. AT THE REQUEST OF VICE PRESIDENT BRANNER, ROGERS REPORTS: Experiments with a Shaking Machine, was undertaken with the hope of offering some explanation, based directly on experiment, of the greater destructiveness of earthquakes in regions where the foundations of structures are supported by more or less soft ground than where these foundations on solid rock. THE FIRST TRUE SHAKING TABLE HAVE BEEN MADE IN THE SIXTIES (UNIVERSITY OF ILLINOIS) DUE TO DEVELOPMENTS OF SERVO- HYDRAULIC EQUIPMENT AND IMPROVEMENTS OF DATA ACQUISITION AND CONTROL SYSTEM

3 DISTRIBUTION OF THE SHAKING TABLES IN THE WORLD Japan Asia A US Europe INSTITUTION Payload Area [tonnes] [m 2 ] DOF 1 NIED - Table ,0x20,0 3 2 Nat. Resear. Instit. for Earth Scien. and Disastr. Prev ,0x6,0 3 3 Nuclaear Power Engineering Corporation ,0x15,0 2 4 NIED - Table ,0x14,5 1 5 Public Works Research Institute ,0x8,0 6 6 Aichi Institute of Tecnology ,0x6,0 1 7 Sanryo Heavy Industies Cirparation ,0x6,0 3 8 Hazama Corp. Ltd ,0x4,0 3 9 Kumagai-Gumi Corp. Ltd ,0x5, Kajiama Corp.Ltd ,0x5, National Research Inatitute of Agriculture Eng ,0x4, Obayashi-Gumi Corporation ,0x5, Fujita Corporation ,0x4, Shinizu Corporation ,0x4, Tobishima Corp. Ltd ,0x4, Taisei Corp. Ltd ,0x4, Hitachi Engineering Corp ,0x4, Building Research Institute ,0x4, Kyoto University ,0x3,0 6 a20 Korea Institute of Machinery and Metals (Korea) ,0x4, National Center for Res. In Earthquake Eng. (Taiwan) ,0x5, Tonji University (China) ,0x4, University of California San Diego (USA) ,0x7, Univerisity at Buffalo (USA) ,6x3, University of California at Berkeley (USA) ,1x6, University of Nevada at Reno, 2 tables (USA) ,3x4, U.S. Army Civil Engineering Research Lab (USA) ,6x3, University at San Diego, 2 tables (USA) ,0x4, Wyle Laboratories (USA) ,1x6, University of Illinois at Urbana-Champaign (USA) ,7x3, CEA (France) ,0x6, EUCENTRE (Italy) ,6x7, Hydropoject Research Institute (Russia) ,0x6, Laboratorio Nacional de Enganharia Civil (Portugal) ,6x4, University of St. Cyril and Methodius (Macedonia) ,0x5, CESI-ISMES (Italy) ,0x4, KFA Juelich (Germany) ,0x5, Univresity of Naples Federico II, 2 tables (Italy) ,0x3, Università della Basilicata (Italy) ,0x2, Enel Hydro S.p.A.; busines unit ISMES (Italy) ,0x4, National Technical University (Athens, Greece) ,0x4, ENEA (Italy) ,0x4, Ansaldo Meccanica Nucleare (Italy) ,5x3,5 3 BEFORE 2000 Italy 5% Europe 16% USA 21% Italy 16% Asia 8% NOWADAYS Japan 50% Europe 14% Japan 44% USA 19% Asia 7% 19 TABLES IN JAPAN 3 TABLES IN ASIA 8 TABLES IN USA 12 TABELS IN EUROPA (7 IN ITALY)

4 DESCRIPTION OF THE SYSTEM DOF Dimension Max payload Acceleration peak 2 for table 3,0 m x 3,0 m 20 t 1,0 g THE TABLES SYSTEM CAN WORK IN A INDEPENDENT WAY OR CAN BE COMBINED TO FORM ONE BIG TABLE (3 m x 7 m) Weight for one table Displacement peak Bandwidth 63 t ± 250 mm for axis 0 50 Hz CLOSED SYSTEM = ACTUATORS AND SERVOVALVES INSIDE POSSIBILITY OF MOTION TABLE (3 7 )

5 DESCRIPTION OF THE SYSTEM The square tables are fixed on strong floor. The former is about 200 mq. with a thickness of about 1.2 meters and an anchorage system with bars placed on box, 80 cm spaced, is placed Sx - 2 Dx - 1 SIMILAR SYSTEM (CEA, FRANCE) (Under construction) ti MOVEMENTATION SYSTEM Each table can be moved SEPARATELY in order to reproduce the seismic asynchronous effect on structures with high spans

6 DESCRIPTION OF THE SYSTEM UPPER PLATFORM (12,5 t) LOWER PLATFORM (23,0 t) ACTUATOR Static force 700 kn Dynamic force 525 kn Operative pressure 28 MPa Testing pressure 42 MPa Displacement peak ± 250 mm FIXED BASE (27,5 t) THE PLATFORMS OF TABLE SYSTEM REST ON OIL FILM SUPPORTED INTO THE CIRCULATION FROM HYDRAULIC SYSTEM DUE TO 5 MOTOR PUMPS (sustenance system) t

7 DESCRIPTION OF THE SYSTEM HYDRAULIC SYSTEM HYDRAULIC SYSTEM CONSTITUTED OF 6MOTOR PUMPS EACH OF THEM SUPPLIES A FLOW 400 l/min POWER RATING: 2400 l/min (PEAK: 3000 L/MIN) 1500 KWatt (60 Watt)

8 PIPING LINES principal system secondary system NO WELDINGS ARE PRESENT ALL PIPES ARE BOLTED motor pumps groups