Abstract
Based on the principle of real-time substructure shaking table test, an interactive numerical computation method which built the calculation model of each substructure in different software programs was proposed for seismic analysis of equipment–high rise structure–soil systems in order to account the effect of nonlinear soil. Considering that the response of soil under strong earthquakes does not totally enter the nonlinear stage, a locally nonlinear soil model was introduced as the numerical substructure, and the equipment–high rise structure subsystem was treated as an experimental substructure in this method. The equation of motion for the equipment–high rise structure–soil system was derived through a combination of the branch modal substructure and linear–nonlinear hybrid constraint modal substructure approaches. A 13-layer steel framework system model is used as an analytical example that the equipment–high rise structure system and local nonlinear soil computing model are built by MATLAB and ANSYS, respectively. The time histories of the system dynamic responses were obtained by interactive numerical computation, to investigate the effects of equipment–high rise structure–soil interaction on the seismic performance of the equipment and structure.
Highlights
With the rapid economic growth, large numbers of high rise structures (HRSs) have been built in the world
This method used the linear–nonlinear hybrid constraint modal substructure approach to construct a locally nonlinear soil (LNS) model considering that the soil is not completely in nonlinear status under strong earthquakes
This confirms that the application of LNS model can provide powerful technical support for nonlinear soil participating in analysis
Summary
With the rapid economic growth, large numbers of high rise structures (HRSs) have been built in the world. Considering that the response of soil under strong earthquakes does not totally enter the nonlinear stage, Wang and Jiang[18] systematically analyzed SSI using the combination of the branch modal substructure and linear–nonlinear hybrid constraint modal substructure approaches and validated the proposed computational method by a case study. Based on the principle of RTSSTT, an interactive numerical computation method was proposed to achieve a simulated process of RTSSTT This method used the linear–nonlinear hybrid constraint modal substructure approach to construct a locally nonlinear soil (LNS) model considering that the soil is not completely in nonlinear status under strong earthquakes. Branch modal substructure method can be employed to derive the equation of motion for the equipment–HRS–nonlinear soil substructure b system, from which the coupling terms between the equipment–HRS subsystem and nonlinear soil substructure b can be obtained. Qib and qbb are the displacements along the internal DOFs and boundary DOFs, respectively, of the nonlinear soil substructure b
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