专用预埋钢绞线吊件力学性能试验研究

Experimental study on mechanical properties of special embedded lifting loop of strand

为研究专用预埋钢绞线吊件与混凝土之间的粘结锚固强度,考虑不同锚固长度、弯折角度、末端形式对承载力的影响。对专用预埋钢绞线吊件进行了与混凝土粘结锚固强度的试验、三种拉拔承载力试验以及与圆钢吊环试验对比试验。通过试验确定了预埋钢绞线吊件与混凝土之间的粘结锚固强度。结果表明:钢绞线吊件的锚固长度达到40d(d为钢铰线直径)以上时,粘结锚固力会大于吊件强度,使钢绞线吊件发生屈服破坏,钢绞线吊件的弯折角度在120°~150°中间对钢绞线吊件承载力基本没有影响,钢绞线吊件的末端经过处理后破坏形态由脆性变为延性且承载力有所增加。结果表明,钢绞线吊件具有良好的力学性能,钢绞线吊件在承载力方面优于圆钢吊环。

In order to study the bonding anchorage strength between the special embedded lifting loop of strand and the concrete,the effect on bearing capacity was considered under various anchorage length,bending angle and the forms of the end.The experiments had been done concerning special embedded lifting loop of strand,namely,the experiment of bonding anchorage strength with the concrete,three experiments of pull-out bearing capacity and the comparative experiment against round steel lifting ring.The bonding anchorage strength between the embedded lifting loop of strand and the concrete was determined by experiments.The results show that yield sabotage would be occur to the lifting loop of strand when whose anchorage length was up to 40d(d is the diameter of steel strand)or longer,simultaneously,the bonding anchoring force would be greater than the strength of the lifting loop.At the condition that the bending angle of the lifting loop of strand is between 120°~150°,which basically has no significant effect on the bearing capacity of lifting loops of strand.The failure form of the lifting loop of strand changed from brittle to ductile and the bearing capacity increased after whose end forms had been treated.The results show that lifting loop of strand has excellent mechanical properties and it is better than round steel lifting ring of bearing capacity.