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首页> 外文期刊>Journal of Constructional Steel Research >Load-transferring mechanism and calculation theory along engaged threads of high-strength bolts under axial tension
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Load-transferring mechanism and calculation theory along engaged threads of high-strength bolts under axial tension

机译：轴张力下高强度螺栓螺纹的负载转移机理与计算理论

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摘要

Bolted connections are widely used in steel structures such as steel buildings, bridges, transmission line steel towers, in which the stress behavior of the bolt is very complex, including tension, shear and bending moment. The load-transferring mechanism along engaged threads is difficult to grasp, especially under the alternating loads or dynamic loads. Therefore, a three-dimensional finite element model with helical threads being considered is established, whose accuracy is validated through the corresponding test. Then, the load-transferring behavior along the engaged threads under axial tension, such as the stress distributions, axial load distributions along the thread, are all investigated. Finally, a modified equation that refers to the elastic thread mechanics proposed by Yamamoto is proposed based on the numerical results, and the impact factor R defined as the ratio of actual force to average axial tension is adopted for the evaluation of load distributions along bolt threads. The results show that during the whole loading process, the load-sharing proportions of 1st and 2nd bolt threads increase first and then decrease, and that of the 3rd thread has no obvious change, and those of other threads decrease first then increase linearly. The slippages in engaged threads zone 0.22P apart from the nut loaded surface do not occur, and the slippages of the zone from 0.22P to 0.61P rapidly increase and get to maximum, after that decrease linearly. Besides, the modified formula, which takes the effects of the plastic deformation and contact surfaces into account, is proved to be more reasonable. (c) 2020 Elsevier Ltd. All rights reserved.
机译：螺栓连接广泛用于钢结构，例如钢制建筑，桥梁，传输线钢塔，其中螺栓的应力行为非常复杂，包括张力，剪切和弯矩。沿接合线的负载转移机构难以抓握，尤其是在交替的负载或动态负载下。因此，建立了具有螺旋线的三维有限元模型，其精度通过相应的测试验证。然后，沿着轴向张力下的接合螺纹的负载转移行为，例如应力分布，沿着螺纹的轴向载荷分布。最后，提出了一种改进的等式，其基于数值结果提出了亚马逊提出的弹性螺纹力学，并且采用了作为实际力与平均轴向张力的比率的冲击因子R进行了评估沿螺栓螺纹的负载分布。结果表明，在整个装载过程中，首先增加第一和第二螺栓螺纹的负载共享比例然后减小，并且第3螺纹的变化没有明显的变化，并且首先将其它螺纹的减少然后线性减少。从头螺纹区域的滑动距离与螺母装载的表面相比，不会发生，区域的滑动从0.22倍到0.61p迅速增加并最大程度，在线性降低之后。此外，经过修饰的公式，其涉及塑性变形和接触表面的效果，被证明更合理。 （c）2020 elestvier有限公司保留所有权利。

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