钢板加固螺栓球节点力学性能试验研究

Experimental study on mechanical properties of bolted spherical joints strengthened with steel plates

针对螺栓球节点高强螺栓漏拧、少拧的情况,实际工程中常采用焊接钢板加固螺栓球节点来保障螺栓球节点承载力。为探究钢板加固螺栓球节点的破坏形式及极限承载力规律,对三组高强螺栓拧入深度0.5d(d为螺栓直径)螺栓球节点采用钢板加固并进行受拉承载力试验。试验结果表明,钢板加固螺栓球节点虽能提高节点的承载力,但试件高强螺栓和钢板变形很难协调,共同受力不理想,易发生局部破坏。故对原有加固方法进行改进,并进行加固后螺栓球节点拉伸破坏试验。结果表明,改进后的钢板加固螺栓球节点力学性能得到很好的提升,可为螺栓节点加固提供保障。

Aiming at the high⁃strength bolts’fake tightened⁃up phenomena of the bolted spherical joints,welded steel plate is often used to reinforce bolted spherical joints to ensure its bearing capacity in practical engineering.In order to study the failure mode and ultimate bearing capacity law of bolted spherical joints strengthened with steel plate,three groups of bolted spherical joints strengthened by steel plates with 0.5d(d is bolt diameter)high⁃strength bolts’screwed depth were tested for tensile strength.Experimental results show that the bearing capacity of bolted spherical joints strengthened with steel plates can be improved,but it is difficult to coordinate the deformation of high⁃strength bolts and steel plates,and local failure occurs due to the uncoordinated stress of joints.The original reinforcement method was improved,and the tensile failure tests of bolted spherical joints after reinforcement were carried out.The results show that the mechanical properties of the improved steel plate reinforced bolted spherical joints are greatly improved,which provide guarantee for the reinforcement of bolted joints.