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针对梁柱刚接的防屈曲支撑钢框架,根据能量平衡的概念提出基于能量的抗震设计方法,使结构在罕遇地震作用下满足给定的目标位移。设计方法以钢框架与防屈曲支撑在目标位移下耗散的能量之和等于地震输入能量为准则进行能量分配。地震输入能量以原钢框架的地震输入能量为基准,计入结构周期和延性变化的影响进行调整后得到,并以结构在位移幅值下循环1周耗能作为总耗能。建立防屈曲支撑的耗能需求曲线和目标位移下的耗能能力曲线,求得防屈曲支撑的截面面积。应用此方法设计3跨5层的防屈曲支撑钢框架结构,采用ANSYS软件建立有限元模型,对所设计的钢框架结构进行罕遇地震作用下的时程分析,结果表明:应用此方法设计的梁柱刚接防屈曲支撑框架在地震作用下最大层间位移角与给定的设计目标较为一致,所设计的结构安全可靠。
Aiming at the buckling - supported steel frame with just - connected beam and column, an energy - based seismic design method is proposed according to the concept of energy balance so that the structure can meet given target displacement under the rare earthquakes. The design method distributes the energy with the sum of the energy dissipated by the steel frame and the buckling support at the target displacement equal to the seismic input energy. The input energy of earthquake is based on the seismic input energy of the original steel frame and is adjusted after the influence of structural period and ductility change is taken into account. The energy consumption of one cycle of the structure under the displacement amplitude is used as the total energy loss. The energy demand curve of anti-buckling support and energy consumption curve under target displacement are established to obtain the cross-sectional area of anti-buckling support. The anti-buckling supported steel frame structure of 3-span and 5-storey is designed by this method. The finite element model is established by ANSYS software. The time-history analysis of the designed steel frame structure under rare earthquakes is carried out. The results show that The maximum displacement angle between two beams under the seismic action is consistent with the given design goal. The designed structure is safe and reliable.