Constant-damage residual ratios of SDOF systems subjected to pulse type ground motions

Document Type : Research Article

Authors

1 Ministry of Roads &Urban Development, Kermanshah,Iran

2 Department of Civil Engineering, Faculty Engineering, Razi University, Kermanshah, Iran

Abstract

Residual displacement is an important index to quantify post-earthquake structural performance, as it provides information about the structure reparability and its structural performance during aftershocks. This manuscript presents the results of a statistical study into residual ratio, i.e. the ratio of the residual displacement to the maximum inelastic displacement, for single degree of freedom (SDOF) systems with constant damage performance under 71 near-source pulse type ground motions. The residual ratios are calculated for 30 SDOF systems having vibration periods between 0.1 and 3.0s, two hysteretic models, three ultimate ductility capacities and four damage index levels (DI). The effects of seismic and modeling parameters such as the peak ground acceleration to peak ground velocity ratios (AP/VP), hysteretic model, ultimate ductility capacity and strain hardening ratio on residual ratios are also evaluated. The results indicate that the residual ratios in the whole range of periods are strongly dependent on the damage index, DI, and mean residual ratios increase with the increase of damage index, DI. The findings clarify that the residual ratios are significantly influenced by the AP/VP. Additionally, they show that the hysteretic model of SDOF systems and strain hardening ratio have more obvious effects on the residual ratios than the ultimate ductility capacity.

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