Evaluation of Park-Ang Damage Indicator in collisions of two adjacent frames under the near-fault field disturbances

Abstract

Pounding of adjacent buildings during earthquake causes local and total damages in buildings. One of the ways to reduce the damage in pounding, is creating a separation gap between two adjacent buildings. Park-Ang's damage index computes the amount of damage to the structure, according to the amount of deformation and the amount of energy absorbed by the earthquake reciprocating forces. In this study, estimates the effect of far-field and near-field earthquakes, on the Park-Ange damage index in pounding of two adjacent frames and separation gap is equal to the value proposed by Standard 2800.The frames are arranged in three, regular and irregular soft story and very soft story frames on the first floor. These frames are analysed under 5 far-field records and 5 near-field earthquake records. Accordingly, three steel moment frames are placed in pair proximity states and Park-Ang's damage index is calculated using dynamic analysis of the nonlinear time history with the OPENSEES software. Non-linear viscoelastic element is considered as a link element. The results indicate that in the regular frames, the average damage magnitude in the near-field earthquakes is about 12% more than the far-field earthquakes. In the soft story and very soft story frames on the first floor, the mean values of the damage index in the near- field are about 5% and 3% more than the far-field earthquakes.

Keywords

• damage index
• pounding
• earthquake near the fault zone
• earthquake far the fault zone moment steel frame
• earthquake