Shear building representations of seismically isolated buildings

Seismic isolation, with its capability of reducing floor accelerations and interstory drifts simultaneously, is recognized as an earthquake resistant design method that protects contents of a building along with the building itself. In research studies, superstructures of seismically isolated buildings are commonly modeled as idealized shear buildings. Shear building representation corresponds to an idealized structure where the beams are infinitely stiff in flexure and axially inextensible; columns are axially inextensible; and rigid floors are supported on these columns. Although it is more convenient to model and analyze a shear building, such an idealization may influence the seismic responses of seismically isolated buildings. This study presents a comparison of the seismic performances of seismically isolated buildings with superstructures modeled as shear buildings to those with full three dimensional superstructures. Both linear and nonlinear base isolation systems with different isolation periods and superstructures with different number of stories are considered.

[1]  Massimo Fragiacomo,et al.  Design of bilinear hysteretic isolation systems , 2003 .

[2]  Farzad Naeim,et al.  Design of seismic isolated structures , 1999 .

[3]  James M. Kelly,et al.  Torsional Displacements in Base-Isolated Buildings , 2000 .

[4]  Arturo Tena-Colunga,et al.  Torsional response of base-isolated structures due to asymmetries in the superstructure , 2002 .

[5]  Izuru Takewaki,et al.  Robustness of base‐isolated high‐rise buildings under code‐specified ground motions , 2008 .

[6]  Costas P. Providakis,et al.  Effect of LRB isolators and supplemental viscous dampers on seismic isolated buildings under near-fault excitations , 2008 .

[7]  Iradj G. Tadjbakhsh,et al.  Response of Sliding Rigid Structure to Base Excitation , 1984 .

[8]  I. C. Medland,et al.  Base isolation systems for earthquake protection of multi-storey shear structures , 1979 .

[9]  Vasant Matsagar,et al.  Influence of isolator characteristics on the response of base-isolated structures , 2004 .

[10]  Michael C. Constantinou,et al.  Nonlinear Dynamic Analysis of 3‐D‐Base‐Isolated Structures , 1991 .

[11]  Anil K. Chopra,et al.  Dynamics of Structures: Theory and Applications to Earthquake Engineering , 1995 .

[12]  R. S. Jangid,et al.  Base isolation for near‐fault motions , 2001 .

[13]  Petros Komodromos,et al.  Seismic Isolation for Earthquake Resistant Structures , 2000 .

[14]  Thambirajah Balendra,et al.  Seismic response of base isolated buildings including p‐Δ effects of isolation bearings , 1989 .

[15]  Dora Foti,et al.  Comparative study of the inelastic response of base isolated buildings , 2003 .

[16]  Goodarz Ahmadi,et al.  WIND EFFECTS ON BASE-ISOLATED STRUCTURES , 1992 .

[17]  R. S. Jangid,et al.  Effects of superstructure flexibility on the response of base-isolated structures , 2003 .

[18]  Michael C. Constantinou,et al.  Probabilistic Optimum Base Isolation of Structures , 1983 .

[19]  Michael C. Constantinou,et al.  Optimum Characteristics of Isolated Structures , 1985 .

[20]  Arturo Tena-Colunga,et al.  Torsional amplifications in asymmetric base-isolated structures , 2007 .

[21]  Michael C. Constantinou,et al.  3D-BASIS - Nonlinear Dynamic Analysis of Three-Dimensional Base Isolated Structures: Part II , 1991 .

[22]  C. S. Tsai,et al.  Experimental and computational verification of reasonable design formulae for base‐isolated structures , 2003 .

[23]  Satish Nagarajaiah,et al.  Response of Base-Isolated USC Hospital Building in Northridge Earthquake , 2000 .

[24]  Vasant Matsagar,et al.  Seismic response of base-isolated structures during impact with adjacent structures , 2003 .

[25]  R. S. Jangid.  Optimum lead–rubber isolation bearings for near-fault motions , 2007 .

[26]  Ravi Sinha,et al.  Behavior of Torsionally Coupled Structures with Variable Frequency Pendulum Isolator , 2004 .

[27]  J. Rodgers,et al.  Thirteen ways to look at the correlation coefficient , 1988 .

[28]  Keri L. Ryan,et al.  Comparative Evaluation of Base-Isolated and Fixed-Base Buildings Using a Comprehensive Response Index , 2009 .

[29]  Giuseppe Marano,et al.  Efficiency of base isolation systems in structural seismic protection and energetic assessment , 2003 .

[30]  Harry W. Shenton,et al.  Relative Performance of Fixed‐Base and Base‐Isolated Concrete Frames , 1993 .

[31]  Vojko Kilar,et al.  Seismic behaviour of asymmetric base isolated structures with various distributions of isolators , 2009 .