Direct displacement-based design for seismic retrofit of existing buildings using nonlinear viscous dampers

This paper presents a direct displacement-based design procedure for seismic retrofit of existing buildings using nonlinear viscous dampers according to equivalent linear systems. Unlike conventional methods, the equivalent linear viscous damping provided by the nonlinear viscous dampers is derived based on the assumption that the average energy dissipated between the linear and the nonlinear viscous dampers is equal. Also, the equivalent period and viscous damping for the equivalent linear systems which are used for representing the behavior of bare frames (the buildings without dampers) are derived from the concept of average storage energy and average dissipated energy, respectively. It is shown from nonlinear time-history analyses that the nonlinear action of the retrofitted structures can be reasonably captured by the presented direct displacement-based procedure.

[1]  Gian Michele Calvi,et al.  Displacement-based seismic design of multi-degree-of-freedom bridge structures , 1995 .

[2]  Kai-Wei Chang,et al.  A Non-Iterative Direct Displacement-Based Design Procedure for SDOF Steel Columns: Using Substitute Structure , 2003 .

[3]  Meng-Hao Tsai,et al.  Displacement‐based seismic design for buildings , 2002 .

[4]  Kuo-Chun Chang,et al.  On the non‐iterative procedure of direct displacement‐based seismic design for portal R.C. bridges: Using inelastic design spectrum , 2005 .

[5]  Peter Fajfar,et al.  Capacity spectrum method based on inelastic demand spectra , 1999 .

[6]  Paul C. Jennings,et al.  Equivalent Viscous Damping for Yielding Structures , 1968 .

[7]  J. S. Hwang,et al.  Direct displacement-based design for building with passive energy dissipation systems , 2003 .

[8]  Anil K. Chopra,et al.  Direct Displacement-Based Design: Use of Inelastic vs. Elastic Design Spectra , 2001 .

[9]  John W. Wallace Seismic Design of RC Structural Walls. Part I: New Code Format , 1995 .

[10]  M. Priestley DISPLACEMENT-BASED SEISMIC ASSESSMENT OF REINFORCED CONCRETE BUILDINGS , 1997 .

[11]  Mervyn J. Kowalsky,et al.  A displacement‐based approach for the seismic design of continuous concrete bridges , 2002 .

[12]  Mervyn J. Kowalsky,et al.  Direct displacement-based seismic design of concrete buildings , 2000 .

[13]  J. P. Moehle,et al.  Displacement-Based Design of RC Structures Subjected to Earthquakes , 1992 .

[14]  John W. Wallace,et al.  Displacement-Based Design of Slender Reinforced Concrete Structural Walls—Experimental Verification , 2004 .

[15]  Wilfred D. Iwan,et al.  Estimating Earthquake Response of Simple Hysteretic Structures , 1979 .

[16]  M. Sozen,et al.  Inelastic Responses of Reinforced ConcreteStructure to Earthquake Motions , 1974 .

[17]  T. T. Soong,et al.  Passive Energy Dissipation Systems in Structural Engineering , 1997 .

[18]  T. T. Soong,et al.  Passive Energy Dissipation Systems for Structural Design and Retrofit , 1998 .