Abstract
The article presents higher modes accounting method under estimation of system seismic resistance by nonlinear static method. As part of the study, in order to verify the proposed method for finding the inertial forces modified system a complex of dynamic and static calculations was performed. It is established that proposed inertial forces modified system can significantly reduce system seismic resistance lack.
Highlights
Abstract.The article presents higher modes accounting method under estimation of system seismic resistance by nonlinear static method
Upper node maximum horizontal displacement obtained by multimodal pushover analysis, mm Middle node maximum horizontal displacement obtained by multimodal pushover analysis, mm
Lower node maximum horizontal displacement obtained by multimodal pushover analysis, mm Maximum bending moment near the anchorage obtained by multimodal pushover analysis, kNm
Summary
To determine the response of the system, taking into account the influence of higher vibration modes, we consider the following method with modified system of inertial forces. The inertial forces modified system is the system based on forces superposition the SRSS-method, in which the top displacement of considered model will correspond to the total displacements obtained by response spectrum analysis. The linear system deformation energy with ainertial forces modified system is identical to the system deformation energy, taking into account plastic deformations. The seismic resistance evaluation stage is to plot the capacity curve ―Force at the base Vb Displacement of the system top ∆‖ based on nonlinear static calculation for the system with one degree of freedom under the modified inertial forces system
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