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弱连体刚度小,地震作用下不能协调塔楼振动且受力不利。考虑地震动的非平稳性,运用虚拟激励法对耗能阻尼减震柔性连接与非减震刚性连接的弱连体结构在非平稳随机激励下的地震响应进行研究。采用Bouc-Wen模型与刚度退化的Bouc-Wen模型分别模拟连体滞变特性与塔楼各楼层的滞变特性,建立弱连体结构非线性化动力方程。运用混合精细积分法对每一时刻的响应进行求解,得到弱连体结构在非平稳随机激励下的位移、速度时变方差。基于首次超越破坏准则,研究非平稳随机地震激励下弱连体结构的塔楼与连体的动力可靠度。运用上述理论,分析某高层双塔连体结构在8度(0.2g)多遇、罕遇地震作用下的随机地震响应。研究结果表明,高层双塔连体结构的层间位移响应呈现强烈的非平稳性,地震作用下耗能阻尼减震柔性连接对提高连体结构的动力可靠度效果明显,表明耗能阻尼减震连体方案为弱连体结构设计推荐方案。
The stiffness of the weak conjoined body is small, and the vibration of the tower cannot be coordinated under the action of the earthquake and the force is unfavorable. Considering the non-stationarity of ground motion, the seismic response of the weak conjoined structure with energy-absorbing, shock-absorbing, flexible connection and non-shock-absorbing rigid connection under non-stationary random excitation is studied by using the virtual excitation method. The Bouc-Wen model and the Bouc-Wen model with degenerate stiffness are used to simulate the hysteresis characteristics of the connected body and the hysteresis characteristics of each floor of the tower. The nonlinear dynamic equation of the weak conjoined structure is established. The mixed precise integration method was used to solve the response at each time, and the displacement and velocity time-varying variance of the weak conjoined structure under the non-stationary random excitation was obtained. Based on the first-ever surpassing failure criterion, the dynamic reliability of towers and conjoined bodies with weakly conjoined structures under non-stationary random seismic excitation is studied. Using the above theory, the stochastic seismic response of a high-rise twin-tower conjoined structure subjected to 8 degree (0.2 g) multiple encounters and rare earthquakes was analyzed. The results show that the response of the layer displacement of the high-rise twin towers is strongly non-stationary. The energy-absorbing, damping, and damping flexible connection under the action of the earthquake has obvious effect on improving the dynamic reliability of the connected structure, which shows that the energy dissipation damps damping. The Siamese program is a recommended design for weakly connected structures.