螺纹型栓钉连接件抗拉性能试验分析

Analysis on tensile property test of threaded stud connectors

为研究栓钉连接件的抗拉性能,进行了2组10个螺纹型栓钉连接件在重复张拉加载下的抗拉强度试验,试件设计中考虑了不同的栓钉埋置深度、栓钉螺帽直径、钢板孔径等影响因素,在试验基础上分析了栓钉的初始刚度、屈服强度、抗拉强度、最大变形、钢板孔口混凝土破坏形式等。试验研究表明:(1)当栓钉的埋置深度一定时,螺帽直径越小、钢板孔径越大,栓钉最大变形越大;(2)在栓钉螺帽直径、钢板孔径一定的情况下,栓钉的埋置深度对其最大变形影响很小;(3)钢板孔径不同,混凝土破坏形式不同,随着孔口的增大,混凝土逐渐呈倒圆锥状破坏。此外,采用预埋钢管后安装栓钉的方式便于实际施工,有利于栓钉连接件的推广应用。

In order to study threaded stud connectors＇ tensile strength, two groups that each group had ten threaded stud connectors were used under repeated tension loading test. In the specimens design, the effects when buried in different depths, different nut studs＇ diameters and different apertures of steel plates were considered. Based on the experiment, the initial stiffness, yield strength, tensile strength, maximum deformation of studs and the destroyed forms of concrete at orifice of steel plate were analyzed. The results show that when the buried depth of a stud is invariant,the smaller the diameter of the nut and the larger the aperture of steel plate is, the greater the maximum deformation of the studs is. When the nut diameter of studs and the aperture of steel plate are invariant, the buried depth has very small effect on maximum deformation of studs. When the sizes of steel plates are different, as well as the damage form of concrete, the increase size of the orifice, the concrete shows an inverted cone-shaped broken down process. Beside, the way of placing pre-buried steel tubes before install threaded studs is easy for application in practical construction.