用实时拟动力试验方法研究滑移摩擦隔震系统的可行性

Feasibility of Research on Slipping Friction Seismic Isolation System with Real Time Pseudo-Dynamic Test

用数值计算分析了采用实时拟动力试验方法研究滑移摩擦隔震装置的可行性。重点考察了拉格朗日插值方法对作动器位移与速度精确度的影响。通过对一个七个自由度结构模型设置滑移摩擦隔震支座动力反应时程的分析可知,用实时拟动力试验系统研究滑移摩擦类隔震结构是可行的。通常当Δt=0.01s,δt=0.001s时,SGT外插值运算的次数不应超过五次,内插值的运算次数可以不受限制。宜采用三阶拉格朗日插值计算公式,以控制动力反应速度失真及突变速度的大小。在进行实时拟动力试验时必须考虑作动器系统位移滞后的影响,标定滞后时段长度,并在编制控制程序时予以补偿。

A numerical investigation was carried out to analyze the feasibility of research work for the slipping frication seismic isolation system with real time pseudo-dynamic test.Most of the work was concentrated on the influence of Lagrange interpolation method on the accuracy of actuator velocity.It is shown that through analysis in time history of dynamic response on a 6 DOF structural model the research work is feasible.In general,when Δt=0.01 and δt=0.001,the number of extrapolation should not be larger than 5,while the number of interpolation is not restricted.The 3rd Lagrange interpolation is suggested to be used in order to alleviate the velocity distortion and the sudden velocity conversion.The actuator delay should be compensated in programming based on the delay calibration.