钢筋混凝土不等肢异形柱抗剪性能试验研究

Experimental Research on Shear Behaviors of Specially Shaped RC Columns with Different Lengths of Limbs

为了考察钢筋混凝土不等肢异形柱的抗剪性能,对12个不等肢异形柱试件进行了低周反复荷载作用下的试验研究.试验结果表明:异形柱的2个柱肢均发生较为严重的破坏,翼缘也具有抗剪作用;随翼缘增大,钢筋混凝土不等肢异形柱斜截面的抗剪承载力提高;水平荷载作用方向不同时,不等肢异形柱的抗剪承载力和变形能力不同.根据试验结果,考虑翼缘混凝土对异形柱抗剪承载力的作用对相关规范中给出的公式进行了修正,使之适用于钢筋混凝土异形柱抗剪承载力的计算.

Twelve model colunms were tested under low reversed cyclic loading to investigate the shear behaviors of specially shaped RC （ reinforced concrete） columns with different lengths of limbs. The effects of different factors, such as the length of limbs, the direction of horizontal force and the spacing of lateral reinforcements, on the shear behaviors were investigated. The experimental results indicate that the two limbs of a specially shaped RC column have an effect to resist shear force, and the shear capacity increases with the increase of flange length. Furthermore, the shear capacity and deformation capacity of a specially shaped RC column vary with changes in the direction of horizontal force. Finally, a modified formula considering the effect of flange length was suggested based on the experimental results to be possible to calculate the shear capacity of specially shaped RC columns with different lengths of limbs.