Recently, concerning failure of structures due to earthquakes, special investigations of near fault ground motions have been noticed. Hence, in this paper, characteristics of near field ground motions have been considered in horizontal and vertical directions. In this consideration, the record averages have been compared with Uniform Building Code and Eurocode8 spectra in two levels. In additio...

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. ...

This study focuses on developing fragility-based seismic vulnerability assessment techniques for seismically retrofitted multi-column bridge bent. Fragility curves are developed using Probabilistic Seismic Demand Model (PSDM) to assess the relative performance of different retrofit methods under near fault ground motions. Two different retrofit techniques namely CFRP jacketing and ECC jacketing...

Uncertainties of the ground motions and structural parameters are main factors that limit accuracy embankment seismic fragility assessment. In response to uncertainties motions, artificial synthesizing method near-fault pulse-like was proposed, 15 with rupture fault distances ranging from 1 km were synthesized by taking Chi-Chi earthquake in Taiwan, China, as an example. The Xi’an-Baoji express...

A dynamic stability criterion for elastic–plastic structures under near-fault ground motions is derived in closed form. A negative post-yield stiffness is treated in order to consider the P-delta effect. The double impulse is used as a substitute of the fling-step near-fault ground motion. Since only the free vibration appears under such double impulse, the energy approach plays a critical role...