悬挂式巨型框架体系优化设计

Optimimal Design of the Steel Frames System with Mega-suspended

提出了一种悬挂式巨型框架体系,并基于简化准则,将其格构式主体简化为梁、柱模型,利用SAP2000软件讨论其模型合理性,而后利用静力弹塑性分析方法将梁、柱模型简化为层模型,通过分析证实层模型的有效性。在此基础上,采用3条人工地震波,利用自编程序进行弹塑性地震响应时程分析。结果表明:对于悬挂式结构,在进行结构抗震设计及优化时,应综合考虑主结构位移及主子结构间的相对位移,而后确定其子结构刚度进行设计,抑或采取附加粘性阻尼,使其减小主结构位移的同时有效地减小主子结构间的位移差,避免其因位移差较大而产生的结构碰撞;附加阻尼的悬挂式巨型框架预应力体系,其主体结构约束得到加强,体系抗侧位移减小,且由于粘性阻尼器的存在,结构振动速度减慢,体系能量耗散由结构自身的塑性变形破坏转移至阻尼器上,有效地保护了结构本身,同时,实现了对其用钢量的优化,设计时可加以考虑。

A new pattern steel structural building-frames system with mega-suspended is presented. Based on the simplified guidelines, the lattice major structure of the system is simplified a beam-column model, software SAP2000 is used to check its rationality. Then, the beam-column model is simplified a multi-mass-system by pushover method. Based on the above process, seismic response of the model multi-mass-system is analyzed by the time history method under three seismic waves. The results show that, displacement of major structure and relative displacement between substructure and major structure should be taken into account in the aseismic and optimal design of the suspension, meanwhile viscous dampers also can be taken to reduce the two aspects displacement to avoid the crash; the displacement of additional -damping-prestress system declines with the increase of the structural constraint, and the system vibration velocity slows because of viscous dampers, energy dissipation transfers from plastic deformation to the dampers absorption which protects the structure effectively, and the result realizes the optimization of total steel quantity.