Investigating Seismic Behavior of Regular Slender Buildings, Regarding How to Satisfy Drift Control Criteria

Based on Iranian Standard 2800, drift of each story for the lateral seismic loading should not exceed the mentioned values. It is stipulated in the Note of this article that in drift calculation, the period of the building can be determined through experimental formula, mentioned in the code or be calculated by the analytical methods. Regarding that experimental base formulas normally give shorter period, so they lead to stronger structures. Application of analytical base period for special moment resisting structure leads to a structure with less weight and strength, which satisfy the criteria and thus is acceptable. In this research, some buildings with special moment resisting regular slender structures are considered and designed twice based on two assumptions, with and without considering the article note. To compare these building, their damage indices and endurance times were calculated through nonlinear three dimensional time-history analyses. Analyses show that, structure designed based on analytical period not only has lighter structure, but also have better seismic behavior and more endurance time under “in” series of ET records.