Date of Award
Master of Science
Evidence indicates that the vertical component of ground motion is more significant than previously thought, especially for near fault events. However, many design codes do not reflect the importance of the vertical component of ground motion. Therefore, the purpose of this thesis is to determine what effects the vertical component of ground motion has on a structure by way of comparison. Specifically, structural response due to the lateral components of ground acceleration is compared to structural response due to all three components of ground acceleration. Structural response includes the following parameters: story drift; axial force; shear; torsion; and bending moment. Variables are fundamental period of vibration, ground motion record, and presence of cross-bracing. Through nonlinear dynamic time history analysis, it is shown that the vertical component of ground motion greatly affects axial force response for these short-period frames. However, the story drift is unaffected for the short, medium, and long-period frames. Other parameters show varying degrees of dependence or independence in relation to the vertical component of ground motion.
This thesis is Open Access and may be downloaded by anyone.