Which site class corresponds to a shear wave velocity of 2500-5000 ft/s?

The correct classification for a shear wave velocity in the range of 2500-5000 ft/s corresponds to Site Class B. Site Class B is defined by specific criteria regarding the soil and rock types, and in this case, the shear wave velocity indicates dense soil or soft rock. Higher velocities signify more competent materials, which support the designation of Site Class B, reflecting how these conditions influence seismic response during an earthquake.

Site Class A, on the other hand, applies to hard rock with shear wave velocities greater than 5000 ft/s, which would not fit the specified range. Site Class C includes shear wave velocities from 1200 to 2500 ft/s and typically pertains to more loosely compacted soils. Similarly, Site Class D characterizes less competent materials with shear wave velocities lower than 1200 ft/s, indicating a significant reduction in the structural response under seismic loading. Therefore, understanding these classifications is crucial for seismic design and overall geotechnical practice.