框架-分布双段摇摆芯筒-核心筒体系调谐减震机理及性能研究

Study on tuned damping mechanism and performance of frame‑distributed bi‑rocking tubes‑core tube system

为了减小传统框架-核心筒(FCT)结构体系筒体围合面积,进一步提高结构的经济性,提出框架-分布芯筒-核心筒(FDCT)高层结构体系;将分布芯筒与摇摆体系相结合形成框架-分布摇摆芯筒-核心筒(FDRCT)结构体系,旨在控制结构的变形模式。为了降低高阶振型对高层结构的不利影响,进一步提出具有调谐减震性能的框架-分布双段摇摆芯筒-核心筒(FDBRCT)结构体系。建立各结构的动力学模型和方程,并进行平稳随机振动分析,初步证明FDBRCT结构可以更为有效地降低结构的动力响应。对比FCT,FDCT,FDRCT以及FDBRCT结构的时程分析结果,FDCT结构由于刚度被削弱导致抗震能力下降,FDRCT改善了结构变形的不均匀程度,上部楼层加速度有所减小但顶层位移会增大。相较于FDRCT结构,FDBRCT结构的层间位移角最大值明显减小,变形更加均匀,适当降低了顶层位移响应以及内力需求,具备调谐能力的分布双段摇摆芯筒使FDBRCT结构在提高经济性的同时兼具更为优越的抗震、减震性能。

In order to reduce the tube area proportion of the traditional frame⁃core tube(FCT)structure system and improve the structural economy,a high⁃rise structural system of the frame⁃distributed tubes⁃core tube(FDCT)is designed.The distributed tubes and rocking system are combined to form the frame⁃distributed rocking tubes⁃core tube(FDRCT)structural system,which can control the deformation mode of the structure.To reduce the adverse effects of higher modes on high⁃rise structures,the frame⁃distributed bi⁃rocking tubes⁃core tube(FDBRCT)structural system with tuned damping performance is further proposed.The dynamic models and equations of the structure are established,and the stationary random vibration analysis is carried out,which preliminarily proves that the FDBRCT structure can reduce the dynamic response of the structure more effectively.By com⁃paring and analyzing the structural time⁃history analysis results of the FCT,FDCT,FDRCT and FDBRCT,the seismic capacity of the FDCT structure decreases is due to the stiffness weakening.The FDRCT structure improves the uniform degree of structur⁃al deformation,and the upper floors acceleration decreases,but the roof displacement increases.Compared with the FDRCT struc⁃ture,the maximum of inter⁃story drift ratio of the FDBRCT structure increases significantly and the structural deformation is more uniform.Besides,the roof displacement response and internal force demand decrease appropriately.The distributed bi⁃rocking tubes with tuned damping brings on better seismic capacity and damping performance of the FDBRCT structure,which can im⁃prove the economy at the same time.