scholarly journals Energy dissipation by nonlinear soil strains during soil–structure interaction excited by SH pulse

2012 ◽  
Vol 43 ◽  
pp. 261-270 ◽  
Author(s):  
Vlado Gičev ◽  
Mihailo D. Trifunac
Keyword(s):  
Energy Dissipation ◽  
Soil Structure ◽  
Soil Structure Interaction ◽  
Structure Interaction

scholarly journals Vibration and soil-structure interaction tests of a nine-story reinforced concrete building

1968 ◽  
Vol 58 (3) ◽  
pp. 891-916
Author(s):  
Paul C. Jennings ◽  
Julio H. Kuroiwa
Keyword(s):  
Reinforced Concrete ◽  
Energy Dissipation ◽  
Soil Structure ◽  
Soil Structure Interaction ◽  
Mode Shapes ◽  
Wall Structure ◽  
Damping Factor ◽  
Torsional Mode ◽  
Structure Interaction ◽  
California Institute Of Technology

abstract The Millikan Library Building, a nine-story reinforced concrete shear-wall structure at the California Institute of Technology, was tested dynamically by means of two eccentric mass vibration generators located on the ninth floor. The response levels ranged up to a maximum acceleration of 0:02 g. The natural periods of vibration, the mode shapes and the energy dissipation were measured for the first and second E-W translational modes, the N-S fundamental mode and the first torsional mode. Soil-structure interaction was investigated by measuring foundation motion and nearby soil surface movements during resonent vibrations in the N-S and E-W fundamental modes. Other tests included “man-excited” vibrations at low stress levels and a measurement of resonance of an air handling unit on the roof, which was found to magnify the roof response by a factor of 8.5. The measured fundamental periods were short compared to typical framed structures of this height, 0.50 sec in the N-S direction, 0.66 in the E-W direction and 0.46 in torsion. These values increased roughly 3 per cent over the range of testing. The energy dissipation as measured by a viscous damping factor, varied between 0.70 and 2.00 per cent of critical. This large variation over the testing range indicates that tests at higher stresses are needed to determine the energy dissipation expected during the response to strong earthquake motions. The soil-structure interaction measurements showed that the building responded very nearly as if fixed at the foundation; rocking contributed less than 1 per cent to the total roof motions of the structure and foundation translation about 2 per cent. Although negligible as far as the building motion is concerned, the results demonstrate the possibility of performing full-scale soil-structure interaction experiments.

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