SAND optimization for seismic retrofitting of hysteretic structures with linear and nonlinear fluid viscous dampers (FVDs)

Julia code for size and placement of nonlinear fluid viscous dampers with a simultaneous analysis and design (SAND) optimization approach. The approach is used for retrofitting nonlinear hysteretic structures subjected to transient seismic excitation.

The code shared in this respository can be used for reproducing the numerical results of the examples discussed in:

Pollini N. (2024). Simultaneous analysis and design optimization for seismic retrofitting of hysteretic structures with fluid viscous dampers. Journal of Building Engineering. (https://doi.org/10.1016/j.jobe.2024.109123)

In particular:

• The code PAPER_DampOpt_SAND_2D_Fy.jl reproduces the results of section 6.1;
• The code PAPER_DampOpt_SAND_2D_Fy_Fd_cdkd.jl reproduces the results of section 6.2.

In the example of section 6.1 we consider a 2D shear frame structrue, with nonlinear hysteretic behavior and retrofitted with linear fluid viscous dampers:

The results obtained at the end of the optimization analysis are stored in the folder res_2dof_Fy.

In the example of section 6.2 we consider a 2D shear frame structrue, with nonlinear hysteretic behavior and retrofitted with nonlinear fluid viscous dampers:

The results obtained at the end of the optimization analysis are stored in the folder res_2dof_Fy_Fd_cdkd.

In both cases, the structures are subjected to a seismic ground excitation defined by the following ground acceleration record (El Centro):