插入式基础真型抗拔试验研究

对一种新型杆塔基础——插入式基础进行了大量抗拔室内真型试验，分析了影响插入式基础抗拔极限承载力的各种因素。试验结果表明：角钢在发生屈服前，角钢与混凝土间的拉拔力与角钢的种类无关，荷载-相对位移曲线几乎重合；而一旦角钢发生屈服，由于抗拉屈服强度的不同，角钢的种类对抗拔极限承载力的影响将很大；角钢的抗拔力随着角钢埋入长度的加大而增加；混凝土强度越高，埋入角钢间的摩擦力越大，则抗拔极限承载力越大；配筋率对埋入角钢的抗拔极限承载力影响不大。

Pullout ture experiment on the inserted foundation

The plenty of pullout experiments on a novel type transmission tower foundation which is inserted with angle steels are carried out .The influence on the pullout ultimate bearing capacity of the inserted foundation is analyzed. The results of laboratory tests show as follows: the pullout capacity has nothing with type of angle steel before angle steel yielded, load–displacement curves approximately coinside with each other; while once angle steel yielded, types of angle steels have large influence on the pullout capacity because of the different pullout yielded strengths. The pullout capacity increases with increasing embedded depth. With increasing concrete strength, friction improves greatly, and pullout capacity also becomes larger. Bar ratio has a little effect on the ultimate uplift capacity.