| Torsional interaction effect of structural response has been studied for seismic analysis of structures and piping systems subjected to uniform horizontal support excitation. To analyze the interaction effect, modeling the system as an independent space frame, as a torsionally-coupled multistory building and as a secondary-primary combined system based upon the corresponding analysis methods are presented in this thesis. The values of structure-pipe system response can be found, including the effects of cross-correlations of primary-secondary subsystems. Multiple spectral response excitation is employed. Computer programs have been developed to carry out the seismic analysis. From a selected numeric example of a primary-secondary system, several problems concerning tuned modes interaction, mass ratio, frequency ratio, connection, and multiple response spectrum rules are discussed. |
