Inflection point method of seismic hybrid simulation study on structural nonlinear stage
Aiming at the boundary condition simulation problem of seismic hybrid simulation,a simulation method for boundary conditions of frame structures under nonlinear conditions is proposed.A numerical model of steel frames is established for nonlinear dynamic time history analysis of structures.The effects of four factors,namely,the linear stiffness ratio of beams to columns,the amplification coefficient of ground motion,the axial compression ratio,and the slenderness ratio,on the location of the reverse bending points of steel frame columns are studied.Based on the distribution of the inflection points in the numerical simulation,hybrid seismic simulation using the reverse bending point method is conducted,and the test results are compared with the results of nonlinear numerical simulation.The results show that the linear stiffness ratio of beam to column has a significant impact on the distribution of inflection points of frame columns and the shear distribution of the bottom columns,while other factors have no significant impact.The hybrid seismic simulation using the inflection point method performs well in the elastic and weak nonlinear stages of the structure.The displacement time history curve in the strong nonlinear stage of the structure is relatively close to the nonlinear numerical simulation results,but there are differences in energy dissipation capacity.
seismic hybrid simulationinflection point methodboundary conditionnonlinear structuredistribution of inflection points of frame columns
万方数据
维普
