Continuous rigid-frame bridges (CRFBs) have been widely constructed in high seismicity areas western China. To investigate the seismic response characteristics and whiplash effect mechanism of CRFBs under near-fault ground motions, a long-span CRFB with piers is selected as prototype bridge, nonlinear finite element model developed based on OpenSees. Three groups namely having forward-directivi...

The exact Cagniard-de Hoop solut ions for a point dislocation in half-space are used to construct models of the strong ground motion observed during the February 9, 1971 San Fernando earthquake (PC, = 6.4). By summing point dislocations distr ibuted over the fault plane, three-dimensional models of a f inite fault located in a half-space are constructed to study the ground motions observed at J...

Abstract Near-fault ground motions may contain impulse behavior on velocity records. To calculate the probability of occurrence impulsive signals, a large dataset is collected from various national data providers and strong motion databases. The has number parameters which carry information earthquake physics, ruptured faults, parameters, distance between station several parts fault. Relation s...

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This study presents a new method to find the optimal control forces for active tuned mass damper. The method uses three algorithms: discrete wavelet transform (DWT), particle swarm optimization (PSO), and linear quadratic regulator (LQR). DWT is used to obtain the local energy distribution of the motivation over the frequency bands. PSO is used to determine the gain matrices through the online ...

Sloshing due to ground motion develops large pressure on the walls of water retaining tanks. This paper evaluates the efficacy of padded walls on the reduction of sloshing effects in rectangular water storage tanks subjected to ground motion. An analytical solution based on velocity potential function is provided to obtain the response of  rigid and padded wall tanks in terms of the wave elevat...

We have proposed a characterization method that can reproduce the velocity waveform using few parameters (characteristic values) while retaining characteristics of pulse-like ground motions observed near epicenter (velocity amplitude, pulse period, wavenumber, etc.). In this paper, based on Sugino et al., which be characterized easily and objectively, we propose takes phase into consideration. ...

THE USUAL type of California earthquake is associated with a relative horizontal slipping of the two faces of a fault which lies essentially in a vertical plane. As a consequence of this slipping, the surface of the ground experiences a severe motion in the neighborhood of the fault during large earthquakes. This surface ground motion can be measured, and for the relatively small number of stro...

A double impulse input is used as a substitute for near-fault earthquake ground motions. An explicit expression is derived on the maximum elastic–plastic response of a singledegree-of-freedom damped structure with bilinear hysteresis under the “critical double impulse input” which causes the maximum response for variable impulse interval with the input level kept constant. Owing to the existenc...