Responses of base-isolated shear beam structures to random excitations

Abstract Responses of base-isolated shear beam type structures subject to random ground excitations are studied. Several base isolation systems, including the laminated rubber bearing, the resilient-friction base isolator with and without sliding upper plate, and the EDF system, are considered. Stationary and nonstationary stochastic models for earthquake ground accelerations are considered and the method of time-dependent equivalent linearization in conjunction with moments of the Fokker-Planck equation are used for response analysis. Mean-square statistics of the base raft displacement and the absolute acceleration at the roof of the base-isolated structure are evaluated. A series of parametric studies are also carried out. Comparisons of the results with those for the fixed-base structure show that base isolation systems are, in general, highly effective in reducing mean-square responses of the superstructure. The advantages and disadvantages of various base isolation systems are also discussed.

[1]  Goodarz Ahmadi,et al.  Response of base‐isolated buildings to random excitations described by the Clough‐Penzien spectral model , 1989 .

[2]  Goodarz Ahmadi,et al.  A comparative study of performances of various base isolation systems, part II: Sensitivity analysis , 1990 .

[3]  M. Livolant,et al.  Seismic isolation using sliding-elastomer bearing pads , 1985 .

[4]  Paul H. Wirsching,et al.  Modal Response of Structures , 1970 .

[5]  James M. Kelly,et al.  Aseismic base isolation: review and bibliography , 1986 .

[6]  Goodarz Ahmadi,et al.  Earthquake response of linear continuous systems , 1978 .

[7]  Y. Wen.  Equivalent Linearization for Hysteretic Systems Under Random Excitation , 1980 .

[8]  Goodarz Ahmadi,et al.  Response of frictional base isolation systems to horizontal-vertical random earthquake excitations , 1988 .

[9]  Goodarz Ahmadi,et al.  Nonstationary earthquake response of a sliding rigid structure , 1988 .

[10]  Michael C. Constantinou,et al.  Frictional characteristics of Teflon–steel interfaces under dynamic conditions , 1987 .

[11]  M. C. Constantinou,et al.  Response of a Sliding Structure to Filtered Random Excitation , 1984 .

[12]  M. Khodaverdian,et al.  Dynamics of resilient‐friction base isolator (R‐FBI) , 1987 .

[13]  Naser Mostaghel,et al.  Earthquake response of hills , 1975 .

[14]  Lin Su,et al.  A Probabilistic Comparative Study of Base Isolation Systems , 1990 .

[15]  Masanobu Shinozuka,et al.  Random Processes with Evolutionary Power , 1970 .

[16]  Stephen H. Crandall,et al.  Accumulated Slip of a Friction-Controlled Mass Excited by Earthquake Motions , 1974 .

[17]  A G Davenport,et al.  NOTE ON THE DISTRIBUTION OF THE LARGEST VALUE OF A RANDOM FUNCTION WITH APPLICATION TO GUST LOADING. , 1964 .

[18]  Günter K. Hüffmann,et al.  Full base isolation for earthquake protection by helical springs and viscodampers , 1985 .

[19]  Goodarz Ahmadi,et al.  A comparative study of performances of various base isolation systems, part I: Shear beam structures , 1989 .

[20]  James M. Kelly,et al.  Aseismic base isolation , 1982 .

[21]  Goodarz Ahmadi,et al.  Comparative study of base isolation systems , 1989 .

[22]  Goodarz Ahmadi,et al.  Stochastic earthquake response of structures on sliding foundation , 1983 .

[23]  Lin Su,et al.  Earthquake response of linear continuous structures by the method of evolutionary spectra , 1988 .

[24]  G. N. Bycroft.  White Noise Representation of Earthquakes , 1960 .