What is meant by peak ground acceleration?

Peak Ground Acceleration (PGA) is equal to the maximum ground acceleration that occurred during earthquake shaking at a location. PGA is equal to the amplitude of the largest absolute acceleration recorded on an accelerogram at a site during a particular earthquake.

What is the difference between peak ground acceleration and spectral acceleration?

Peak acceleration is a measure of the maximum force experienced by a small mass located at the surface of the ground during an earthquake. Spectral acceleration is a measure of the maximum force experienced by a mass on top of a rod having a particular natural vibration period.

How do you find peak acceleration?

Solution. Using the fact that the standard acceleration due to gravity, g, is 9.81 m/s2, this answer can be expressed alternatively as: α peak = 1137.0 / 9.81 = 115.9 g .

What does PGA stand for earthquake?

peak ground acceleration
Earthquake hazard zonation using peak ground acceleration (PGA) approach.

What is the peak ground acceleration for Zone V?

The Indian seismic code defined 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 seismicity area, Zone V.

How is ground acceleration different from the Richter scale?

The Richter Scale is basically a measure of an earthquake’s “magnitude” by the amount of energy it releases. Ground acceleration would an effect of an earthquake. An earthquake’s effects are measured by something called the Modified Mercalli Scale.

Why is pseudo acceleration used?

Spectral acceleration, with a value related to the natural frequency of vibration of the building, is used in earthquake engineering and gives a closer approximation to the motion of a building or other structure in an earthquake than the peak ground acceleration value, although there is normally a correlation between …

How the peak response is obtained?

Response spectra thus helps in obtaining the peak structural responses under linear range, which can be used for obtaining lateral forces developed in structure due to earthquake thus facilitates in earthquake-resistant design of structures.

Is zone a factor code?

The IS code assigns a zone factor of 0.10 for Zone 2. It is the zone with low chances of having earthquakes.

What is percent of g in seismic hazard map?

Units for all 3 maps are %g (percent of gravity). This can also be expressed in decimal form, example 10%g = 0.1g. The ground motion values apply to ground motion expected for future individual earthquakes.

How do you calculate pseudo acceleration?

The preferred method for calculating the peak pseudo velocity is to multiply the peak relative displacement by the angular natural frequency as shown in equation (18.10). An alternate method is to divide the peak acceleration by this frequency.

What is pseudo velocity?

What is Pseudo Velocity? Pseudo velocity is equal to the relative displacement SRS (difference between input and response) multiplied by each corresponding wn (2 * pi * natural frequency).

How is peak ground acceleration used in engineering?

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. In an earthquake, damage to buildings…

What’s the maximum ground acceleration of a building?

In seismic engineering, the effective peak acceleration (EPA, the maximum ground acceleration to which a building responds) is often used, which tends to be ⅔ – ¾ the PGA .

What’s the maximum ground acceleration during an earthquake?

Peak ground acceleration (PGA) is equal to the maximum ground acceleration that occurred during earthquake shaking at a location.

Which is the most common type of ground acceleration?