# How are seismic site classes determined?

## How are seismic site classes determined?

The Site Class is based on the average conditions present within 100 feet of the ground surface, and are designated as A-F, with hard rock, considered an ‘A,’ down to potentially collapsible soils, which get an ‘F. ‘ The Site Classification is based on shear wave velocity.

What is SS and S1 seismic values?

Ss: Spectral acceleration parameter at short periods corresponding to the mapped maximum considered earthquake. S1: Spectral acceleration parameter at a period of 1 sec corresponding to the mapped maximum considered earthquake.

What is seismic zone1?

Zone 1. Since the current division of India into earthquake hazard zones does not use Zone 1, no area of India is classed as Zone 1.

### What is seismic resistant design?

Definition. Earthquake resistant design consists of an evaluation of the earthquake excitation and the structure response to this excitation at a particular site in order to provide a structural system that will not collapse, that may prevent loss of life and will limit economic loss during an earthquake.

What does SDS mean in seismic design?

Design Spectral Response at Short Periods
This, the Design Spectral Response at Short Periods or SDS is the final acceleration coefficient used in the design. The Site Factors for various soil types and mapped Acceleration Factors (SS) are listed in the table below.

What is Seismic Site B?

Site Class B may be assigned. to any competent rock site. with moderate fracturing and. weathering, based on either. measured or estimated shear.

#### What is seismic risk category?

The risk category serves as a threshold for a variety of code provisions related to earthquake, flood, snow, wind loads and even the magnitude of special inspections. Particularly noteworthy are the importance factorsthat are used in the calculation of design, earthquake, snow and wind loads.

What is CS in seismic design?

Cs = seismic response coefficient determined in Section. 12.8.1.1 and 19.3.1 (dimensionless)

What is SDS in seismic design?

This, the Design Spectral Response at Short Periods or SDS is the final acceleration coefficient used in the design. The Site Factors for various soil types and mapped Acceleration Factors (SS) are listed in the table below.

## What are the 4 seismic zones?

The four zones of earthquake in India, as discussed below:

• Seismic Zone II: Zone II is classified as the low-damage risk zone.
• Seismic Zone III: Seismic Zone 3/III is classified as the moderate-damage risk zone.
• Seismic Zone IV: Zone IV is considered the high-damage risk zone.