Research on horizontal seismic action of energy dissipation structure based on complex mode decomposition response spectrum method
The energy dissipation structure has the characteristics of non-proportional damping.When the forced decoupling method is used to calculate the vibration mode decomposition,ignoring the non-diagonal elements of the damping matrix may cause low calculation accuracy.In this paper,the complex mode decomposition response spectrum method(CCQC)of energy dissipation structure is proposed,and the inertia expression formula of complex mode earthquake action is given.Based on an engineering example of energy dissipation structure,the inter-story shear force and inter-story displacement response results of the structure using the complex mode decomposition response spectrum method and the real mode decomposition response spectrum method(CQC)are compared and analyzed under three groups of ground motions,and the direct integration method is used to compare and verify them.The results show that the accuracy of the analysis results based on the CCQC of energy dissipation structure is significantly higher than that of the CQC method without considering the influence of non-proportional damping.
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