层间铰连抗侧力桁架的抗震性能计算研究

Seismic Behavior of the Inter-Story Hinged Lateral Resistance Braced Frame

基于框架发生侧移时呈现的杆件挠曲特征,提出一种可对框架层间变形进行有效约束的层间铰连抗侧力桁架体系(RBF体系)。采用SAP 2000程序,对RBF体系在多遇地震下的内力与变形进行分析,使用Pushover方法对罕遇地震下的屈服机制进行研究。结果显示,RBF体系具有显著的刚度增强效应,可以实现结构刚度可控退化,保证结构的抗震延性。RBF体系不会改变原结构竖向力的传递路径,还可适用于对已有建筑进行抗震加固。

Based on the deflection of structural components occurring at the lateral deformation of moment frames,the author proposed a new lateral resistance RBF(R-Brace Frame)system,which is capable of effectively limiting the drift of tall buildings.To evaluate internal force distribution and deformation of the RBF system,FEM program SAP2000 was used.Pushover method and capacity spectrum method were used to assess yielding mechanism of seismic performance of the structure under rare earthquake.The findings revealed that the RBF system had a major impact on improving the structure′s lateral stiffness.The stiffness deterioration of the RBF system is controllable,and the seismic ductility of the structure can be guaranteed by the RBF system.The RBF system would not alter the direction of propagation of the vertical force of the initial structure.It is ideal for existing buildings for seismic retrofitting.