How do you calculate peak ground acceleration?
The peak horizontal ground acceleration (PHA or PHGA) can be reached by selecting the higher individual recording, taking the mean of the two values, or calculating a vector sum of the two components. A three-component value can also be reached, by taking the vertical component into consideration also.
What is peak floor acceleration?
SUMMARY. Peak horizontal floor acceleration (PHFA) is now widely used by the engineering community for estimating the vulnerability of both attached and unattached acceleration sensitive nonstructural elements.
What is the peak ground acceleration for Zone V?
The code design peak ground acceleration (PGA) for the Maximum Considered Earthquake (MCE) is 0.36 g and the Design Basis Earthquake (DBE) is 0.18 g for service life of structure, for the highest area, Zone V.
How is PGA calculated?
PGA is calculated using attenuation function that describes the correlation between the local ground movement intensity the earthquake magnitude and the distance from the earthquake’s epicentre.
How do you convert PGV to PGA?
The PGV to PGA ratio is known as a significant parameter for the damage assessment of structures under earthquake shakings. As a matter of factratio PGV/PGA = 1/w i.e. the inverse of the circular frequency = 1/(2πf) = T/(2π ). In actual fact the earthquakes are not SHM but has time varying frequency and amplitude.
What is peak ground velocity?
In regards to an earthquake, “velocity is how fast a point on the ground is shaking as a result of an earthquake,” and the peak ground velocity is the greatest speed of shaking recorded at particular point during an earthquake. [
What is the difference between peak ground acceleration and spectral acceleration?
PGA (peak acceleration) is what is experienced by a particle on the ground. SA (spectral acceleration) is approximately what is experienced by a building, as modeled by a particle on a massless vertical rod having the same natural period of vibration as the building.
What is DBE and MCE?
MCE or the maximum considered earthquake is defined as the ground shaking level at the building site with a 2% probability of exceedance in 50 years, while DBE or the design basis earthquake is the level with a 10% probability of exceedance in 50 years and is assumed to be two-thirds of MCE.
How is peak acceleration related to spectral acceleration?
What is spectral acceleration (SA)? PGA (peak acceleration) is what is experienced by a particle on the ground, and SA is approximately what is experienced by a building, as modeled by a particle mass on a massless vertical rod having the same natural period of vibration as the building.
What is peak ground displacement?
Abstract. Peak ground velocity (PGV) and peak ground displacement (PGD) are important strong ground motion parameters for correlating with damage caused by an earthquake, for analysis of existing structures and for the design of new structures.
What is g in PGA?
Peak Ground Acceleration (PGA) in units of gravity (g) for major CES events, within the LRI analysis area. PGA data are from Bradley and Hughes (2012a;2012b).
How is peak acceleration related to Spectral acceleration?
What is design basis earthquake DBE?
The uniform ratio of maximum considered earthquake (MCE) to design basis earthquake (DBE) is assumed as 2 in the IS codes, thus leading to non uniform margin of safety at MCE level ground motions. The probabilistic seismic hazard assessment based on these issues is discussed.
What is the difference between peak ground acceleration and Spectral acceleration?
What are the peak ground motion parameters?
For a single frequency ground-motion of infinite duration, such a theoretical link does exist: peak spectral values (acceleration, velocity or displacement) are related to peak ground parameters by the well- known ratio 1/(2ξ), where ξ is the damping ratio.
What is OBE earthquake?
The operational basis earthquake (OBE) is defined by US Federal Regulations 10 CFR 100, Appendix A, as follows: ‘The Operating Basis Earthquake is that earthquake which, considering the regional and local geology and seismology and specific characteristics of local subsurface material, could reasonably be expected to …
What is safe shutdown earthquake?
Is the maximum earthquake potential for which certain structures, systems, and components, important to safety, are designed to sustain and remain functional.
What is SSE and OBE?
Enclosure 7 – Definitions: SSE (Safe Shutdown Earthquake) & OBE (Operating Basis Earthquake).
What is OBE and SSE earthquake?
An NPP is generally designed for two levels of earthquake, namely the S1 level earthquake or Operating Basis Earthquake (OBE), and the S2 level earthquake or Safe Shutdown Earthquake (SSE) [2]. The OBE level earthquake corresponds to that level of earthquake which is expected to occur once during life of the plant.
What is the peak ground acceleration of the time process?
(a) Peak ground acceleration is 0.42 g of original time process; Maximum value = 1468.30 m/g 2 (time: 7 s). Sampling frequency = 50.00 Hz, (b) Peak ground acceleration reduced to 0.260 g of time process.
What is the acceleration due to gravity at peak?
Peak ground acceleration can be expressed in fractions of g (the standard acceleration due to Earth’s gravity, equivalent to g-force) as either a decimal or percentage; in m/s 2 (1 g = 9.81 m/s 2 ); or in multiples of Gal, where 1 Gal is equal to 0.01 m/s² (1 g = 981 Gal).
What is peak acceleration in earthquake engineering?
Peak ground acceleration. It is often used within earthquake engineering (including seismic building codes) and it is commonly plotted on seismic hazard maps. In an earthquake, damage to buildings and infrastructure is related more closely to ground motion, of which PGA is a measure, rather than the magnitude of the earthquake itself.
What is peak horizontal acceleration?
The peak horizontal acceleration (PHA) is the most commonly used type of ground acceleration in engineering applications. It is often used within earthquake engineering (including seismic building codes) and it is commonly plotted on seismic hazard maps.