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http://dx.doi.org/10.12989/sss.2016.18.5.931

Seismic responses of asymmetric steel structures isolated with the TCFP subjected to mathematical near-fault pulse models  

Tajammolian, H. (Faculty of Civil Engineering, Amirkabir University of Technology (Tehran Polytechnic))
Khoshnoudian, F. (Faculty of Civil Engineering, Amirkabir University of Technology (Tehran Polytechnic))
Bokaeian, V. (Faculty of Civil Engineering, Amirkabir University of Technology (Tehran Polytechnic))
Publication Information
Smart Structures and Systems / v.18, no.5, 2016 , pp. 931-953 More about this Journal
Abstract
In this paper, the effects of mass eccentricity of superstructure as well as stiffness eccentricity of isolators on the amplification of seismic responses of base-isolated structures are investigated by using mathematical near-fault pulse models. Superstructures with 3, 6 and 9 stories and aspect ratios equal to 1, 2 and 3 are mounted on a reasonable variety of Triple Concave Friction Pendulum (TCFP) bearings considering different period and damping ratio. Three-dimensional linear superstructure mounted on nonlinear isolators are subjected to simplified pulses including fling step and forward directivity while various pulse period ($T_p$) and Peak Ground Velocity (PGV) amounts as two crucial parameters of these pulses are scrutinized. Maximum isolator displacement and base shear as well as peak superstructure acceleration and drift are selected as the main engineering demand parameters. The results indicate that the torsional intensification of different demand parameters caused by superstructure mass eccentricity is more significant than isolator stiffness eccentricity. The torsion due to mass eccentricity has intensified the base shear of asymmetric 6-story model 2.55 times comparing to symmetric one. In similar circumstances, the isolator displacement and roof acceleration are increased 49 and 116 percent respectively in the presence of mass eccentricity. Furthermore, it is demonstrated that torsional effects of mass eccentricity can force the drift to reach the allowable limit of ASCE 7 standard in the presence of forward directivity pulses.
Keywords
TCFP isolators; near-fault; mathematical pulse model; eccentricity; torsion; steel special moment frames;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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