Damped Performance-Based Plastic Design Method

The PBPD method is an energy-based design method that uses the energy equilibrium equation to calculate the yielding point base shear. The main goals of the PBPD method are to limit the structure drifts and to prevent the plastic hinge formation at the columns to guarantee the global yield mechanism. This study is to import the term of the dissipated energy using the nonlinear viscous damper in the equilibrium equation to make the PBPD method more optimal. Nonlinear incremental dynamic analysis is performed to find the dissipated energy by the damper in a SDOF structure. Five independent dissipated energy formulae, for the considered effective variables, and a final formula, using the combination of them, based on the ۶۳۰ independent data groups, are derived by nonlinear regression. A two-dimensional ۱۰-story steel special moment frame is designed using the PBPD method with and without the new term, the dissipated energy by the nonlinear viscous damper. The nonlinear time history analysis with ۱۲ earthquakes shows that the newly developed energy equilibrium equation results in a lighter structure than the conventional method. The pre-selected drift limitation, as a design target, is satisfied by both methods.

کلیدواژه ها:

Performance-based plastic design (PBPD) ، viscous damper ، energy-based design ، structural energy dissipation ، earthquake energy