钢筋混凝土平板-异形柱板柱节点抗扭构件刚度研究

STUDY ON RIGIDITY OF TRANSVERSE TORSION MEMBER OF REINFORCED CONCRETE FLAT PLATE-SPECIAL-SHAPED COLUMN CONNECTION

在钢筋混凝土平板-矩形柱板柱节点抗扭构件的刚度理论基础上,针对钢筋混凝土平板-异形柱板柱节点的特点,通过提出有效抗扭截面的概念来考虑异形柱柱肢的抗扭作用,根据抗扭构件的刚度变化假定抗扭构件线扭矩呈双折线分布,推导出弹性状态下抗扭构件的刚度计算公式。然后运用有限元程序ANSYS分析确定了异形柱柱肢参与抵抗扭矩的有效柱肢范围和对不同参数下抗扭构件的刚度进行评价。分析结果表明,距平板底面各1倍平板厚度h的异形柱柱肢范围是参与抗扭的有效范围;在评价抗扭构件刚度方面,随着参数的变化有限元分析和计算公式的结果及变化趋势较吻合。抗扭构件的刚度计算公式可应用于钢筋混凝土平板-异形柱板柱结构体系的等效柱理论分析。

The effective torsion section is put forward to reflect the torsion action of the column limb based on the rigidity theory of transverse torsion member of reinforced concrete fiat plate-rectangular column connection and aimed at the characteristic of the reinforced concrete fiat plate-special-shaped column connection. Because the rigidity of the transverse torsion member is various, the hypothesis is made that, the linear torison along transverse torsion member is distributed in two different slant lines. The theory expression of transverse torsion member is derived. By the finite element procedure ANSYS, the effective range of the special-shaped column limb contributed to the torsion rigidity is confirmed and the rigidities of transverse torsion members are evaluated according to different factors. The analysis result also shows that the height of the effective column limb is equal to the thickness of the fiat plate. The trends of rigidities obtained by the finite element method agree well with those of the theory expression method. The theory expression of transverse torsion member can be applied to equivalent column method to analyze the behavior of reinforced concrete fiat plate-special-shaped column structural system.