一种被动的杂交混凝土墩柱分析模型

A Passive Confinement Model for Analysis of Concrete ColumnsConfined by FRP

在轴力作用下杂交混凝土墩柱横向膨胀系数和界面约束应力随纵向应变变化的条件下 ,考虑了混凝土材料的非弹性和各向异性的性质 ,建立了约束混凝土的三维应力 -应变增量方程 ;提出了在杂交墩柱分析中纵向应力由微分增量和变分增量组成的计算方法 ,对杂交墩柱的承载力和界面约束应力进行了分析研究 ;分析了 FRP的厚度和间距等对承载力与界面约束应力的影响 .

It is recognized that transverse confinement on the concrete columns with high strength fiber reinforced polymers(FRP)tube(or straps)can significantly enhance its strength and ductility during several earthquake.When the concrete column is subjected to axial compression,the degrees of strains in lateral direction and the confinement pressures develop owing to poisson's effect.In this paper,the 3D increment constitutive relationships of confinement concrete take into account of inelastic and anisotropic properties are derived.A passive confinement model is proposed in this paper and is applied to calculate the transverse confinement pressure.The effects on the strength of the columns with confinement stresses are studied when the thickness and the spacing of FRP straps are changed.