Abstract

Seismic behavior of short period structures with dampers founded on soft soil is investigated. A Single bay frame with diagonal damper that represents short period structures is evaluated in response to the excitation of a set of earthquake records. The frame system is modeled as a Generalized Single Degree of Freedom System, and is subjected to five earthquake records representative of soft site conditions. The relationship between the force modification factor and the global ductility demand for short period structures founded on soft soil, in the presence of dampers, tends to approach those of long period ones. Compared with seismic demand under general site conditions, short period structures founded on soft soil show higher seismic demand and high sensitivity to earthquake excitations. Similar to seismic demand in general site conditions, and except for period of 0.1 sec, short period structures in soft sites with dampers having damping ratios higher than 20% tend to keep the structural response in the elastic range even for high values of force reductions. Seismic code provisions should be revised to account for short period effect under seismic excitation.

Keywords:

Ductility, force reduction, power spectral density,

References

Competing interests

The authors have no competing interests.

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Copyright

The authors have no competing interests.