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拉剪连接的摩擦型高强螺栓,既承受摩擦面的剪力,又承受垂直于摩擦面的拉力,这在钢结构梁柱连接、斜撑端部连接中常见,这种连接的抗滑承载力将受到螺栓轴向外拉力影响而降低。降低多少? 是否影响摩擦系数? 现结合规范需要进行了如下试验。试件共设6种(包括双、单面两种摩擦面的纯剪连接),钢材为A3F,板表经喷砂处理呈银灰色,采用上海先锋螺丝厂生产的20MnTiB扭剪型高强螺栓M20连接。试验在拉力机上进行,螺轮轴力变化用经过标定的螺栓传感器(压力环) 和YJ-5静态电阻应变仪测量,滑移量由电测位移计、动态电阻应变仪X-Y函数记录仪自动记录,荷载每级50kN,接近滑移时每级20kN。
The friction-type high-strength bolts that are connected by pulling and shearing not only withstand the shear force of the friction surface but also the tensile force perpendicular to the friction surface. This is common in the connection of steel beam and column connections and the connection of diagonal braces. The anti-sliding bearing capacity of this connection is Will be affected by the axial pull of the bolt to reduce. How much does it reduce? Does it affect the coefficient of friction? The following tests are required in conjunction with the specification. A total of six kinds of test pieces (including two pure shear connections with double and single friction surfaces) were used. The steel was A3F. The surface of the plate was sandblasted and silver gray was used. The 20MnTiB torsion shear high strength bolt M20 produced by Shanghai Pioneer Screw Factory was used. connection. The test was carried out on a tensile machine. The change in axial force of the screw was measured with a calibrated bolt sensor (pressure ring) and a YJ-5 static resistance strain gauge. The slip amount was automatically recorded by an electrical displacement gauge and a dynamic resistance strain gauge XY function recorder. The load is 50 kN per stage, and each stage is 20 kN near slip.