型钢-钢纤维混凝土黏结性能及界面损伤分析

为了解决型钢混凝土结构中型钢与钢筋相互干扰、混凝土浇筑困难等施工难题,将型钢混凝土结构中的钢筋笼全部换成钢纤维,形成无配筋型钢-钢纤维混凝土组合结构.通过16个试件的标准推出试验,研究了在不设置钢筋笼的情况下型钢与钢纤维混凝土之间的黏结性能与界面损伤全过程.结果表明:型钢-钢纤维混凝土试件的加载端与自由端受力不同步,界面的黏结受力不均衡;名义黏结强度随钢纤维混凝土保护层厚度的增大而增大,随黏结界面长度的增大而有规律地减小;钢纤维混凝土保护层越厚,黏结界面长度越大,界面在试验中后期的损伤发展越缓慢.

Bond Performance and Interface Damage Analysis of Shape Steel and SteelFiber Reinforced Concrete

In order to solve the construction problems such as the mutual interference between shape steel and reinforcement bars and the difficulty of concrete pouring, the steel cages in the steel reinforced concrete structure were all replaced with steel fibers to form the steel fiber reinforced concrete composite structure without reinforcement bars. 16 specimens were designed and tested by push out testing. The bonding properties and full process of interface damage between shape steel and steel fiber reinforced concrete were studied without steel reinforcement cage. The results show that: the loading end and the free end of the shape steel and steel fiber reinforced concrete are not synchronous, and the bonding force between the shape steel and steel fiber reinforced concrete is not balanced; the nominal bonding strength inereases with the increase of the thickness of protective layer of steel fiber reinforced concrete and decreases regularly with the increase of the bonding interface length; the larger the thickness of protective layer is, the longer the bonding interface length, and the slower the interface damage develops in the middle and late stages of the test.