Seismic Design of Structures Examples

Seismic Forces

Example 1 - Calculating seismic design force and base shear on a 6 story reinforced concrete building

Compute the design seismic force and seismic shear force for a structure given the following information:

 

Building Material - Reinforced Concrete

Nature of Building Occupancy - Adult education facility

Basic Seismic Force Resisting System - Special moment-resisting frame

Number of Stories - 6

Story Heights - 12 ft (all stories)

Story Weights - 1600 Kips

Seismic Risk - High

Soil Class - B

Mapped maximum considered earthquake spectral response accelerations at short periods, Ss - 1.5g

Mapped maximum considered earthquake spectral response accelerations for 1-second period, S1 - 0.6g

 

Also check the lateral deformation of the structure.

The elastic lateral deflection at each floor level under seismic lateral forces was obtained from a static elastic analysis based upon the calculated design seismic force and is also presented below.