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通过专门设置的现场拉拔试验,测定几种钢筋抗浮锚杆外锚固(与基础底板锚固)极限抗拔承载力和滑移量,分析其承载性能和受力机理。研究表明,在标号C30混凝土底板中,相同直径与弯曲半径,不同竖直锚固长度与弯折长度的钢筋抗浮锚杆,均发生拔断破坏,破坏荷载均大于340kN,最大滑移量为11~21mm,各锚杆断裂位置均发生在距混凝土表面7~9cm处,与同等试验条件下不弯折的钢筋抗浮锚杆相比,极限承载力较大,且破坏特征不同;弯曲处理后的钢筋抗浮锚杆与混凝土之间平均粘结强度随着滑移量的增大而提高,随着外锚固长度的增加而降低,与混凝土之间的平均粘结强度的增加速率随滑移量的增大而减小。
Through the specially designed on-site drawing test, the ultimate pull-out bearing capacity and slippage of several kinds of anchorage (anchored to the base plate) of the anchorage of anti-floating anchor rod were measured, and the bearing capacity and stress mechanism were analyzed. The results show that in the C30 concrete slab, both the same diameter and bending radius, different vertical anchorage length and bending length of the rebar anti-floating anchor are broken off, the failure load are greater than 340kN, the maximum slip of 11 ~ 21mm, the breaking position of each bolt occurred at 7 ~ 9cm away from the concrete surface. Compared with the non-bent rebar anti-floating anchor rod under the same test conditions, the ultimate bearing capacity is larger and the failure characteristics are different; after bending treatment The average bond strength between the rebar and the concrete increases with the increase of the slippage and decreases with the increase of the length of the outer anchorage.The rate of increase of the average bond strength with the concrete increases with the slip The amount increases and decreases.