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高塔、高层建筑物振动与形变的超长摆综合观测

VIBRATION AND DEFORMATION OBSERVATIONS OF THE TALL STRUCTURES WITH VERY LONG PENDULUM
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摘要 高大建筑物(如电视塔等)在外力作用和自身老化过程中出现的形变和振动频率特性变化的监测,是灾害预测和工程检验的重要内容。具有测站移动坐标系的超长摆观测系统,可以胜任这一超宽频(0~100HZ)振动和挠曲综合观测要求。文中导出超长摆观测方程xi=-(R^2_iQ^2_s+P^2_i-2R_iQ_sP_icosγ_s)^(1/2)Xmsin(ωt+θ_i)并论证了在相应参数选择下,此系统具有足够的振幅放大系数(S_i≥0.8)和振动周期观测覆盖范围;对超低频一永久形变也具有真实的监测能力(S_i=P_i);具有监测频带宽、动态测量范围大、无漂移、抗干扰等优点。 The monitoring of the deformation and vibration frequency change of tall structures under action of exogenic force and in the process of self ageing is an important content of disaster prediction and engineering examination. The very long pendulum observation system with moving coordlnate system at stations is competent for this job; it can satlsfy the demands of the vibration and deformation observations in very wide frequency band (0~100 HZ). The observation equation for very long pendulum is deduced in this paper: xi=-(R^2_iQ^2_s+P^2_i-2R_iQ_sP_icosγ_s)^(1/2)Xmsin(ωt+θ_i)It is demonstrated that through the proper choice of parameters, both the amplitude amplification factor (Si≥0. 8) and the covering range of the vibration period observation are blg enough for the system. It also has real monitoring ability (Si=Pi) for the very low frequency-permanent deformation observation. Obviously, it has many advantages: the wlde frequency band of observation; the big range of dynamic observation; without drift;less disturbance and so on.
作者 何世海
出处 《地震》 CSCD 北大核心 1997年第4期380-388,共9页 Earthquake
关键词 高层建筑 振动频率 结构变形 超长摆观测 Very long pendulum, Movable station coordinate, Parameter choice,Amplitude amplification, Observational frequency band
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  • 1团体著者,地震学教程.上,1980年,89页

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