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Response spectrum method considering specific dominant natural modes of double layer truss domes subjected to earthquake motions
Koichiro Ishikawa

Last modified: 2020-07-13


This study deals with a practical calculation method of seismic design loads of double layer truss domes considering the vibration characteristics such as the participation factor and the specific dominant mode (Fig. 1). The purpose of this study is to investigate symmetry and asymmetry shapes of the vibration mode and the static equivalent seismic load due to earthquake motions (Fig. 2). The calculation method of the seismic load is proposed using the response spectrum method and the validity is shown in comparison with the time history analysis. The characteristic response of the dome occurs subjected to vertical and horizontal earthquake motions. The design seismic coefficient of the applied load distribution considering the mass distribution on the dome is also actually necessary for the safety study in the earthquake proof design. The study proposes the response spectrum method using the specific dominant natural mode for the applied load for the earthquake-proof design of the dome. The seismic response is easily obtained by means of the eigenvalue analysis. The accuracy is also verified by a good agreement with the time history analysis of the dome subjected to the artificial vertical and horizontal earthquake motions. The proposed method can be used to predict statically the performance to transmit horizontal seismic loads by means of the eigen value analysis the elastic static analysis of the truss dome subjected to the equivalent static load.


double layer truss domes, response spectrum method, time history analysis, vertical and horizontal earthquake motions, equivalent static load, dominant natural mode

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