The NEHRP Provisions provide two seismic hazard maps that contain quantitative measures from which seismic forces on buildings may be determined. Which of the following variables were not considered in developing these maps?
- Geological investigations
- Historical seismicity of an area
- Types of structures built in an area
- Area’s proximity to known faults
The Correct Answer:
B. The NEHRP Provisions provide two seismic hazard maps that contain quantitative measures from which seismic forces on buildings may be determined. The historical seismicity of an area variable should have been considered in developing these maps.
Different states have different levels of risk and hazards for earthquake effect prevention. The national earthquake hazard reduction program, NEHRP, provides risk reduction measures in an unstable region.
It provides maps based on the building design, which helps detect the probability of an earthquake. These maps are listed below:
- Historical seismicity
- The proximity of the location
- The geological investigation that suggests the probability of earthquake ground motion.
Different regions generally require different sets of seismic provisions for acknowledging the protection of a building within a single community.
The most common building that uses these provisions is the police stations, schools, hospitals, auditorium, office buildings, hotels, and fire stations.
The facilities are grouped under different categories that the engineers and the people involved in the building development must follow.
Different design categories include Seismic Design Category A, Seismic Design Category B, Seismic Design Category C, Seismic Design Category D, and Seismic Design Category E.
See all Questions of IS-8.A