FRP管-混凝土-钢管组合双壁空心柱抗震性能的研究进展

Advances in seismic behavior of hybrid FRP-concrete-steel double-skin tubular columns

纤维增强复合材料(FRP)管-混凝土-钢管组合双壁空心柱是一种由FRP外管、钢内管以及两者之间填充的混凝土3部分组成的新型组合柱。FRP外管的纤维缠绕方向为环向或接近环向,可对混凝土提供约束并可提高其抗剪承载力;FRP外管可保护钢内管不接触腐蚀环境,而使其具有优越的耐腐蚀性能;钢管可起到纵筋的作用,为该柱提供轴力;而内部填充的混凝土受到FRP外管和钢内管的共同约束作用,使该柱具有优越的延性和抗震性能。结合国内外研究成果,阐述了FRP管-混凝土-钢管组合双壁空心柱抗震性能的研究进展,分析了FRP管厚度、轴压比、混凝土强度等对该新型组合柱的抗震性能的影响。

Hybrid FRP-concrete-steel double-skin tubular columns are a novel form of composite columns,which consist of an outer tube made of FRP,an inner tube made of steel and an annular concrete section in the space between the two tubes. The FRP outer tube has fibers mainly oriented in the hoop direction or close to the hoop direction,which provides confinement to the concrete and enhances the shear resistance;the FRP outer tube could also protect the inner steel tube from the external harsh environment,which improves the anti-corrosion behavior of the novel composite column. Meanwhile,the inner steel tube could act as longitudinal reinforcement to provide longitudinal force to the column; the annular concrete is confined by the FRP outer tube as well as the inner tube,which ensures the excellent ductility and seismic behavior of the novel columns. Based on existing experimental results in the public literature,this paper introduces the existing study on the seismic behavior of this novel composite column,and discusses the influences of FRP tube thickness,the axial load ratio and the compressive strength of concrete.