Abstract Aiming at evaluating the reliability of the high-strength bolts’ fake tightened-up phenomena of the bolted spherical joints in a spatial grid structure, this research studied the tensile strength, stiffness, and failure modes of the bolted spherical joints with different bolt types and screwing depths using a combined method of the lab experiments and numerical simulations. A total of 40 axial tension tests of the bolted spherical joints were conducted with five different bolt types and eight different screwing depths. The test results showed that the bolted spherical joints with the different bolt screwing depths of high strength bolts suffered three failure modes, namely, the thread failure, bolt fracture failure, and sphere rupture failure. Validated by its feasibility and accuracy, the proposed numerical simulation method of the bolted spherical joints can estimate the ultimate strengths and failure modes, as well as the detailed stress distribution and failure development process. According to the test and numerical analysis results, a group of calculation formulas was developed for predicting the tensile strength of bolted spherical joints with different bolt screwing depths.

中文翻译：

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高强螺栓不同旋入深度螺栓球面接头的抗拉承载力

摘要 为评价空间网格结构中高强螺栓球节螺栓假紧现象的可靠性，研究了不同螺栓类型螺栓球节的抗拉强度、刚度和失效模式。使用实验室实验和数值模拟相结合的方法确定拧紧深度。用五种不同的螺栓类型和八种不同的旋入深度对螺栓连接的球形接头进行了总共 40 次轴向拉伸试验。试验结果表明，高强度螺栓不同螺栓旋入深度下的球面接头发生螺纹破坏、螺栓断裂破坏和球体断裂破坏三种破坏模式。经其可行性和准确性验证，所提出的螺栓球形接头数值模拟方法可以估计极限强度和失效模式，以及详细的应力分布和失效发展过程。根据试验和数值分析结果，建立了一组计算公式，用于预测不同螺栓拧入深度的螺栓连接球接头的抗拉强度。