全轻混凝土的钢筋粘结锚固性能试验研究

Experimental study on bonding properties between bras and full lightweight concrete

通过对22组全轻混凝土分别与HPB300光圆钢筋和HRB500带肋钢筋粘结锚固试件的拉拔试验,探讨两种不同钢筋类型对全轻混凝土粘结性能的影响。研究表明:与普通混凝土类似,影响全轻混凝土与HRB500钢筋的粘结锚固性能主要因素为混凝土强度、保护层厚度、配箍率、锚固长度,影响全轻混凝土与HPB300钢筋的粘结锚固性能主要因素为混凝土强度和锚固长度;相同强度等级下,全轻混凝土的粘结锚固性能并不比普通混凝土差,在相同配箍率下甚至优于普通混凝土,但变形大于普通混凝土;全轻混凝土沿锚固长度粘结应力分布与普通混凝土基本一致。

The main influencing factors of the cohesive and anchoring properties of the full lightweight concrete and HRB500,HPB300 are analyzed by the drawing test of 22 groups. The results are as follows： similar to ordinary concrete,the main factors that affect the bond and anchoring performance of full light concrete and HRB500 steel are concrete strength,protective layer thickness,stirrup rate and anchorage length. The main factors that affect the bonding and anchoring performance of full light concrete and HPB300 reinforced concrete are concrete strength and anchorage length. The strength and anchorage length of the whole strength concrete are not worse than that of the ordinary concrete under the same strength grade,but even better than the ordinary concrete under the same stirrer,and the deformation is larger than that of the ordinary concrete. The stress distribution of the whole light concrete along the anchorage length is basically the same as the ordinary concrete.