新型外包钢组合梁框架结构抗震性能试验

Experiment on seismic performance of steel-encased composite beam frame

为克服普通组合框架结构体系存在的缺点,首次提出新型外包钢混凝土组合梁-型钢混凝土柱组合框架结构体系.设计制作了一榀单跨两层型钢混凝土柱-外包钢混凝土梁的组合框架结构模型,并通过施加恒定竖向荷载和低周反复水平荷载,对模型框架进行了抗震性能试验.试验表明,该榀组合框架在地震时能形成梁铰破坏机制,框架的变形能力、承载能力、延性、耗能能力等均满足延性框架的抗震要求,且模型框架的有效延性系数达到了7.5.新型型钢混凝土组合柱-外包钢混凝土组合梁框架结构的抗震性能优于钢框架结构和钢筋混凝土柱-钢梁框架结构,可在中高层建筑中推广应用.

To overcome the shortcomings of common composite frame structure, a new type of frame structure system, steel-encased composite beam-steel reinforced concrete column, is presented. In order to investigate the behavior of the system, a 1 bay, 2-stories model of composite frame is designed and manufactured. The composite frame is composed of steel-encased concrete composite beams （SCCB） and steel reinforced concrete columns. The experimental study on seismic behaviors is carried out under vertical stable loads and lateral cyclic loads. The result shows that its deformation capacity, bearing capacity, ductility and energy dissipation meet the requirement for seismic design of ductile frames. SCCB frame may form a beam-hinged collapse mechanism when it is destroyed. Its effective ductility factor reaches 7.5. The seismic performance of the SCCB frames is superior to that of steel frames or reinforced concrete column-steel beam frames, so that the SCCB frames are suitable for applying to the multi-story residential buildings.