摘要
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 specially designed pull-out test,ultimate anti-lifting bearing capacity and slippage of external anchorage(and foundation slab)of some kinds of steel anti-floating anchors were monitored,analyzed their bearing performance and working mechanism.The results show that in the condition of C30 concrete floor,the steel anti-floating anchors with the same diameter and bending radius are fracture failure above the concrete surface 7~9cm in the different vertical anchorage length and bent length,the breaking load of steel anti-floating anchors are over 340 kN,their maximum slippage are 11~21mm,Compared to the straight steel anti-floating anchors at the same condition,the bend anti-floating anchors has higher ultimate anti-lifting bearing capacity and different failure characteristic;the generalized average bond strength between steel anti-floating anchors and concrete enhances with the increase of slippage quantity,and decreases with the increase of external anchorage length.The average bond strength increases rate between steel anti-floating anchors and concrete decreases with the increase of slippage quantity.
出处
《土木建筑与环境工程》
CSCD
北大核心
2016年第S1期118-124,共7页
Journal of Civil,Architectural & Environment Engineering
关键词
钢筋抗浮锚杆
外锚固
弯折长度
承载性能
滑移量
steel anti-floating anchors
external anchorage
bent length
load bearing behavior
slippage
