China
Africa
Explore chapters and articles related to this topic
Seismic site amplification and wave energy
Published in Takaji Kokusho, Innovative Earthquake Soil Dynamics, 2017
Actually, the acceleration is not relevant to determine structural damage by itself, because the seismic wave energy defined in Eq. (1.2.25), which seems to closely correlated with the damage, is dependent not only on the wave amplitude, acceleration or particle velocity, but also on the soil impedance where the ground motion is recorded. In United States, Arias Intensity (Arias 1970) proportional to the time-integral of squared acceleration time-histories is sometimes used in earthquake engineering to measure a sort of seismic intensity similar to the energy, though it is not actually the wave energy in the exact physical meaning because of non-involvement of soil impedance. The wave amplitude, acceleration or velocity, cannot be meaningful by itself in view of damage potential without the associated impedance values where that value was recorded if the wave energy governs the damage. Hence, when a design motion with a given amplitude is discussed, it is essential to identify the soil condition or impedance where the motion was defined or recorded.
Development of Vibration-Based Parameters as Damage Sensitive Features for Bridge Structures
Published in Nigel Powers, Dan M. Frangopol, Riadh Al-Mahaidi, Colin Caprani, Maintenance, Safety, Risk, Management and Life-Cycle Performance of Bridges, 2018
Arias Intensity, defined by Arias (1970), is a vibration parameter used to describe an earthquake’s energy over its total duration and is commonly used as an indicator of an earthquake’s damage potential. () IA=π2g.∫0∞x¨(t)2dt
Seismic stability analysis of rock slopes
Published in Duncan C. Wyllie, Rock Slope Engineering, 2017
A hazard assessment of a specific site can be made using a technique developed by Harp and Wilson (1995) that involves calculating the Arias intensity of the ground motion at the location of interest. The Arias intensity Ia is a measure of the total released energy of the ground motion and is proportional to the square of the acceleration integrated over the entire time history (units of m/s). The Arias intensity is discussed further in Section 11.4.2.
Seismic Damage of Submerged Intake Tower under the Sequence of Mainshocks and Aftershocks
Published in Journal of Earthquake Engineering, 2022
Morteza Aghaeipoor, Mohammad Alembagheri
Arias intensity is an important measure of the intensity of a ground motion, as it is able to reflect multiple characteristics of the motion simultaneously. Whereas most common scalar ground-motion measures, such as PGA, or individual ordinates of spectral acceleration, reflect a very specific aspect of the ground motion, Arias intensity, whilst remaining a scalar measure, is able to capture and represent multiple attributes of the overall ground motion (Arias 1969). Arias intensity describes the cumulative energy per unit weight absorbed by an infinite set of SDOF oscillators having fundamental frequencies uniformly distributed in (0,∞)(Arias 1969; Travasarou, Bray, and Abrahamson 2003). In the most general case, the expression for Arias intensity may be written as (Kayen and Mitchell 1997):
Application and comparison of logistic regression model and neural network model in earthquake-induced landslides susceptibility mapping at mountainous region, China
Published in Geomatics, Natural Hazards and Risk, 2018
Peng Xie, Haijia Wen, Chaochao Ma, Laurie G. Baise, Jialan Zhang
The intense ground motion could cause a short-lived distribution in the balance of forces within natural slopes, which is the main reason for landslides. The Arias intensity is the most suitable for characterizing earthquake impacts (Hsieh et al. 2011; Chousianitis et al. 2014), and it is estimated by the integration of the squared acceleration overtime. However, owing to the fact that the Arias intensity incorporates more information content, a single parameter, the most commonly used parameter to describe earthquake ground motion is PGA (Xu et al. 2013; Li et al. 2013a; Hsieh et al. 2011; Chousianitis et al. 2014; Li et al. 2013b; Tian et al. 2017).
Seismic Risk Assessment of New Zealand Unreinforced Masonry Churches using Statistical Procedures
Published in International Journal of Architectural Heritage, 2018
Alessandra Marotta, Luigi Sorrentino, Domenico Liberatore, Jason M. Ingham
Arias Intensity, IA, is selected as a ground motion descriptor because it captures the potential destructiveness of an earthquake as the integral of the square of the acceleration-time history (Travasarou, Bray, and Abrahamson 2003) and because it has been demonstrated to be an effective predictor of the likelihood of damage to short-period structures (Stafford, Berrill, and Pettinga 2009). As defined by Arias (1970), IA is the total energy per unit weight absorbed by a set of undamped single-degree-of-freedom oscillators at the end of an earthquake, calculated as follows: