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通过对102个化学植筋和18个预埋钢筋组成的120个混凝土植筋试样进行了详细的拉拔试验对比分析,研究结果表明混凝土强度、钢筋直径、锚固长度、植筋孔径和方式是影响钢筋平均极限拉拔力与胶-混界面极限平均粘结力的重要因素,采用混凝土预埋筋和后植筋时钢筋平均极限拉拔力基本相同,表明2种方式可以达到补强混凝土的相同效果,且试件主要呈现钢筋拉断、胶-混界面破坏和混凝土劈裂破坏形式。基于理论分析建立了混凝土劈裂破坏时钢筋极限拉拔承载力计算式和植筋界限孔径。
A detailed drawing test was carried out on 120 concrete-planaked specimens consisting of 102 chemical planting bars and 18 embedded bars. The results show that concrete strength, steel bar diameter, anchorage length, anchorage diameter and method are The most important factor that affects the average ultimate pull-out strength of steel bars and the ultimate average adhesive force of the plastic-mixed interface is that the average ultimate pull-out force of the steel bars is the same with the embedded steel bars and the post- The same effect, and the specimen showed mainly tensile break, plastic - mixed interface damage and concrete splitting failure form. Based on the theoretical analysis, the formula of the ultimate pullout capacity of reinforced concrete and the limit aperture of planting bar were established.