Acceleration amplification due to rotational components of near-fault earthquakes in triple concave friction pendulum base-isolated structures

作者：Tajammolian Hamed; Khoshnoudian Faramarz^*

来源：Canadian Journal of Civil Engineering, 2018, 45(4): 314-327.

DOI：10.1139/cjce-2016-0354

• rotational components
• acceleration
• triple concave friction pendulum (TCFP) isolators
• near-fault
• Fourier transformation

Recent studies show that rotational components of earthquakes can amplify the floor acceleration in a base-isolated structure. As a result, the seismic force of nonstructural components could be significantly increased. In this paper, a simple rectangular deck with various geometrical properties mounted on triple concave friction pendulum (TCFP) bearings is examined. At first a set of three translational components from 25 near-fault ground motion records are considered. Then, three rotational components, i.e., torsional and two rocking motions are computed for each earthquake. The results of nonlinear dynamic analysis in a rectangular structure with an aspect ratio in plan equal to 3, demonstrate that the acceleration approximately intensifies 3.4 times in presence of all six ground motion components compared to three translational ones. Finally, a new formula is proposed to determine the maximum acceleration of base-isolated structure without performing the dynamic analysis due to rotational components of ground motions.

• 出版日期2018-4