连接方式对非对称双塔连体结构动力可靠度影响

Influence of connection style on dynamic reliability of the asymmetric double-tower connected structure

针对非对称双塔连体结构受力特点和地震地面加速度在强震阶段内的大致平稳性,采用串并联质点系层模型建立了5种连接方式下连体结构计算模型,将状态空间分析法、Bouc-Wen模型等效线性化与虚拟激励法相结合,求解不同连接方式下连体结构的平稳随机响应;利用获得的随机响应并结合动力可靠度理论讨论了小震、大震下高层连体结构的动力可靠度以及不同连接方式对结构在大、小地震功率谱作用下连体结构动力可靠度的变化规律,采用Monte Carlo方法对所给模型进行了验证计算。研究结果表明:耗能柔性连接方式在小震下对提高连体结构动力可靠度效果较明显;大震下连接方式对塔楼的可靠度影响不明显,但对连体可靠度影响较大;当采用非耗能连接方式连接时,随连体与塔楼连接方式增强对毗邻塔楼可靠度影响显著,分析了结果产生的原因,为实际工程应用和研究提供一些参考。

According to the loading features of the asymmetric high-rise connected double tower structure and the roughly stationary characteristic of the ground acceleration under strong earthquakes, the connected structural calculation models under five connection methods were established with the serial-parallel system of particles storey model. The coupling characteristics of the connected structure under different connection methods were discussed and explored. The stationary random responses of the connected structure under different connection methods were solved with the combination of state space analysis method, equivalent linearization of Bouc-Wen model and the pseudo excitation method. The dynamical reliability of the high rise connected structure in small and major earthquakes, as well as the variation rules of the dynamical reliability of connected structure under the power spectrum function of small and large earthquakes in the cases of different connection methods was discussed in detail by taking advantage of the random response obtained and dynamic reliability theory. The Monte Carlo method is adopted for calculation to validate the given model. According to the research results, the power-wasting flexible connection method has a distinct effect on improving the structural dynamical reliability under small earthquakes, while it has little influence on the reliability of tower under large earthquakes. However, it has a huge influence on the connection reliability. When the non-power wasting connection method is adopted, the strengthening connection type between the connection and the tower has a significant influence on the reliability of the adjacent tower, and the causes to the results have been analyzed, which provides some useful information for future reference in the practical engineering application and research.