连接方式对高层连体结构动力可靠度影响研究

Influence of Connection Style on Dynamic Reliability of the Connected High-rise Building

针对高层连体结构受力特点,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,探讨了不同连接方式下连体结构耦联特性;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,详细讨论了小震、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影响规律。研究结果表明:耗能柔性连接方式在小震下对提高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。

Aiming at the loading features of the high-rise connected structure, the connected structural calculation model under five connection methods is established with the serial-parallel system of particles storey model, and the coupling characteristics of the connected structure under different connection methods are discussed and explored. The stationary random response of the connected structure under different connection methods is 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 change rule for the dynamical reliability of connected structure under the power spectrum function of small and large earthquakes owning to different connection methods is discussed in details by taking advantage of the random response obtained and dynamic reliability theory. 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 with the connection and tower has a significance influence on the reliability of the adjacent tower, and the causes to the results have been analyzed, which will provide some references for the practical engineering application and researches.