scholarly journals THE EFFECT OF SEDIMENTARY BASIN STRUCTURE ON PREDOMINANT PERIOD OF SEISMIC GROUND MOTION

2015 ◽  
Vol 80 (708) ◽  
pp. 219-229 ◽  
Author(s):  
Yoshihiro TERASHIMA ◽  
Takashi HIRAI ◽  
Nobuo FUKUWA
Keyword(s):  
Ground Motion ◽  
Sedimentary Basin ◽  
Predominant Period ◽  
Seismic Ground Motion ◽  
Basin Structure

Dynamic Response of Tall Buildings on Sedimentary Basin to Long-Period Seismic Ground Motion

2016 ◽  
Vol 11 (5) ◽  
pp. 857-869 ◽  
Author(s):  
Nobuo Fukuwa ◽  
◽  
Takashi Hirai ◽  
Jun Tobita ◽  
Kazumi Kurata ◽  
...  
Keyword(s):  
Ground Motion ◽  
Sedimentary Basin ◽  
Tall Buildings ◽  
Ambient Vibration ◽  
Reciprocal Theorem ◽  
The 2011 Tohoku Earthquake ◽  
Natural Period ◽  
Seismic Ground Motion ◽  
Wave Amplification ◽  
Long Period

Characteristics of long-period seismic ground motion and response of tall buildings are investigated in this paper to promote earthquake proof countermeasures considering the damage caused by the 2011 Tohoku earthquake. 3D finite difference method and the reciprocal theorem are used to examine the effect of sedimentary basin structures on seismic wave amplification. Natural period and damping of tall buildings are evaluated by ambient vibration tests and earthquake response observation during construction or demolition of the buildings. The effects of dynamic soil-structure interaction on response amplification of tall buildings are confirmed applying wave propagation theory to a continuum building model. Finally, a newly built base-isolated building with an isolated rooftop laboratory is introduced for full-scale long-period shaking experiment by installing actuators and jacks. Experience of long-period shaking in the building is also available with virtual reality view of indoor damage, which is effective for promotion of seismic countermeasures such as fixing furniture and safe evacuation.

Dynamic Characteristics of Base-Isolated Steel Frame under Seismic Ground Motion

2011 ◽  
Vol 255-260 ◽  
pp. 2341-2344
Author(s):  
Mohammad Saeed Masoomi ◽  
Siti Aminah Osman ◽  
Ali Jahanshahi
Keyword(s):  
Ground Motion ◽  
Base Isolation ◽  
Time History ◽  
Steel Structure ◽  
Steel Structures ◽  
Steel Frame ◽  
Nonlinear Time History Analysis ◽  
Seismic Load ◽  
Vector Method ◽  
Seismic Ground Motion

This paper presents the performance of base-isolated steel structures under the seismic load. The main goals of this study are to evaluate the effectiveness of base isolation systems for steel structures against earthquake loads; to verify the modal analysis of steel frame compared with the hand calculation results; and development of a simulating method for base-isolated structure’s responses. Two models were considered in this study, one a steel structure with base-isolated and the other without base-isolated system. The nonlinear time-history analysis of both structures under El Centro 1940 seismic ground motion was used based on finite element method through SAP2000. The mentioned frames were analyzed by Eigenvalue method for linear analysis and Ritz-vector method for nonlinear analysis. Simulation results were presented as time-acceleration graphs for each story, period and frequency of both structures for the first three modes.

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