不同构造界面腐蚀对焊钉连接件承载力的影响

Influence of Corrosion with Different Connecting Configuration on Shear Bearing Capacity of Stud

为了研究不同构造的钢与混凝土界面在腐蚀环境下对焊钉连接件受力性能的影响,设计了6种不同构造的钢-混凝土结合面构造形式,并考虑钢与混凝土之间的滑移效应的影响,制作了24个试验试件,其中21个试件进行了盐雾腐蚀试验,3个试件处于正常环境中.通过推出试验,测试了各个试件中焊钉的荷载-滑移关系,得到了焊钉的抗剪承载力.试验结果表明,采用钢板厚度方向上外包混凝土构造形式的试件具有更好的抗腐蚀性能,焊钉具有更高的抗剪强度,腐蚀后单钉承载力平均值为177.6kN,而在钢与混凝土界面产生初始滑动的试件具有较差的抗腐蚀性能,焊钉抗剪强度明显降低,腐蚀后单钉承载力平均值为153.3kN,比没有滑移的试件降低9.6%.

In order to study the influence on static behavior of stud connector with different configuration layouts between the steel-concrete interface under corrosion environment,six types of layout were designed considering the relative slip between the steel and concrete.24 specimens including 21 specimens under corrosion environment and 3under normal environment were fabricated and used in the push-out test.The relationship between load and slip was tested during the push-out test,and the shear bearing capacity were measured.The results show that the structure with steel wrapping the concrete has a better corrosion resistance.The specimens with such layout has a higher shear resistance,and the average capacity of single stud is 177.6 kN. When the interface is slipped before the corrosion,the shear resistance is reduced compared to other specimen without pre-slip,and the average capacity of single stud after corrosion is 153.3kN which is 9.6percent less than the specimens without preslip.