螺旋扭增强材料表面特征对锚固性能的影响

Experimental Research on the Influence of Shape Character of Helical and Twisted Material on Bond Anchorage Property

研究了拔出试验中P-S曲线反映的螺旋扭增强材料的粘结锚固机理。在P-S曲线上具有第2个更高的峰值是螺旋扭状增强材料粘结锚固性能的主要特征;节距对P-S曲线上的第1峰没有明显影响,随着节距增大,第2峰值减小、峰值的位置后移;材料横截面形态对于2个峰值均有影响,对于矩形截面,其横截面越扁,2个峰值越大。

The characteristic of bond property of helical and twisted reinforcement was studied, and the influence of pitch and cross section on the bond property through experiment was analyzed respectively. The results indicated that the pitch didn＇ t have much influence on the first peak on the pullout-slip curve of helical and twisted reinforcing material. But with the increase of pitch, the second peak turned smaller and its slip turned bigger. The bigger the ratio of cross section area to perimeter, the smaller the first peak; the larger the ratio of cross section area to vertical projection area, the smaller the second peak. Besides, this paper also introduced some equation which expressed how the shape of cross section influences bond property.