Title: Seismic performance of bridges with variable friction pendulum system
Authors: V.R. Panchal; R.S. Jangid; Bhargav B. Shobhana
Addresses: M.S. Patel Department of Civil Engineering, Chandubhai S. Patel Institute of Technology, Charotar University of Science and Technology, Anand, Gujarat, 388421, India ' Department of Civil Engineering, Indian Institute of Technology Bombay, Powai, Mumbai, Maharashtra, 400 076, India ' M.S. Patel Department of Civil Engineering, Chandubhai S. Patel Institute of Technology, Charotar University of Science and Technology, Anand, Gujarat, 388421, India
Abstract: In this paper, the effectiveness of a variable friction pendulum system (VFPS) is studied and compared with friction pendulum system (FPS) for the three span continuous deck bridge which is subjected to six different near-fault ground excitations and trigonometric cycloidal pulses. For studying seismic performance of the bridge, the piers and the deck are considered as flexible and rigid respectively. Newmark's iterative method was used to evaluate governing equations of motion assuming linear change of acceleration for relatively small-time step. Additionally, a detailed parametric study was carried out to study the seismic performance of isolated bridge with VFPS system. From the analyses carried out, it is established that the seismic response of the bridge under near-fault ground excitations is significantly reduced when equipped with VFPS. A good comparison has been done on the bridge system considered, to investigate the response of near-fault ground excitations with corresponding response due to trigonometric cycloidal pulses.
Keywords: variable friction pendulum system; VFPS; base isolation of bridges; friction pendulum system; FPS; near-fault motions; trigonometric cycloidal pulses; seismic performance of bridges.
International Journal of Structural Engineering, 2021 Vol.11 No.4, pp.342 - 363
Received: 30 Apr 2020
Accepted: 28 Aug 2020
Published online: 11 Oct 2021 *