论文部分内容阅读
对高柔结构受地震动水平-摇摆作用的地震响应问题进行了试验和理论研究。推导了地震动水平-摇摆耦合作用下高柔结构的动力方程,将基础转角位移产生的附加P-Δ效应以等效水平侧向力的形式添加在动力方程的激励项中。基于水平和竖向单摆式地震仪对地震动摇摆分量灵敏度不同的原理,采用小波分析,从未修正地震动水平分量中获取了摇摆分量。以一电视塔结构为原型,进行了地震动水平、摇摆和地震动水平-摇摆耦合作用下高柔结构的缩尺模型振动台试验,并与理论分析结果进行对比研究。结果表明:振动台试验结果与推导的动力方程理论分析结果基本吻合,验证了理论分析的正确性;由基础转角位移产生的附加P-Δ效应不仅会增大高柔结构的动力效应,而且会导致高柔结构产生显著的非对称位移,从而使得结构的水平位移大幅增加,在实际的抗震设计计算中应予以重视。
The experimental and theoretical study on the earthquake response of high-flexible structures subjected to the level-swing effect of ground motion was carried out. The dynamic equation of the high-flexible structure under the action of ground motion-swing coupling is deduced, and the additional P-Δ effect generated by the basic corner displacement is added to the excitation term of the dynamic equation in the form of the equivalent horizontal lateral force. Based on the principle that the horizontal and vertical pendulum-type seismographs have different sensitivity to the shaking component of ground motion, the wavelet analysis is used to obtain the wobble component from the horizontal component of the uncorrected ground motion. Taking a television tower structure as a prototype, a shaking table test of a scale model of a high-flexible structure under horizontal-swinging and ground-sweeping ground motions was performed, and compared with theoretical analysis results. The results show that the results of the shaking table test are basically consistent with the theoretical analysis results of the derived dynamic equation, which verifies the correctness of the theoretical analysis. The additional P-Δ effect resulting from the basic corner displacement will not only increase the dynamic effect of the high-flexible structure, but also This results in a significant asymmetric displacement of the high-flexible structure, which results in a significant increase in the horizontal displacement of the structure, which should be taken into account in the actual seismic design calculations.